Volume X`lii - American Radio History

Transcript

>^"-.-7....1!er VOLUME X`lII ,A, 51 N mum www.americanradiohistory.com GAMBLE PAGE GAMBLE-SKOGMO, INC. January 15, 1947 TI -A 6SA7 C 6SK7 i CONVERTER 8 1ST AUDIO O, CI -A ( 6SQ7 1 ©o0I) Ao a 4 --.= 15) CI ( O I T`-',/.4-z:4. ( o o0 o° z R2 O o Ñ3 6K6GT 290.017 AVC AMP. I. ) - 17-1 43-5005 MODEL R4 -. (>M "emus < V'I PE C4 TI V 7 B 1 Lc : R COIL R --+v.+v.A-a 5 RB 106 a7.`, 6X5GT VIBRATOR C19 I RID IIBE 8 C12 -e 2 C I F C2 LI TO SI C16 CII Schematic Diagram Reference Part No. SETS R-5 AND C-7 Ce !duoli T ON SOME 124-187 129-161 129-2 129-188 129-21 129-12 11749B _ -NI No. Used in Set Description BATTERY SPARK IF P. ATE IS ELIMINATED AND THE Generator Cond Ammeter Clond. C12 A -B -C Electrolytic Filter Condenser-20 Mfd. x 26 Volt; 15 Mfd. x 350 Volt; 15 Mfd. x 350 Volt C1 -A -B Ant. and Ose. Dual Trimmer _ C8A-B .0001 Dual Mica-10% C3, CIO .0005 Mica Type -20% .00008 Mica Type-3% C2 .0002 Mica Type -20% C4 -.-_.._..__....._..... C19 .00025 Mica Type -20% -.-...-.--....C18 Spark Plate ._ _.__....-............. .6 MM. .5 MM. R9 R10 C-981-27 C-981-29 C -9B1-60 C -9B1-34 C-981-23 C -9B1-31 C -9B1-22 C -9B2-76 C -9B2-64 C -9B1-50 C -9B1-52 C -9B1-66 Rll Rl Part No. Schematic Diagram Reference C-211-10961 Tl -A; Tl -B L3 L1 -L2 1 1 1 2 1 1 1 1 1 1 1 1 104296 T5 ©John F. DIAL A -SD -10740 D -4B-10750 1121029 128773-46 116860 128766-45 1121027 A -53A-10989 120442 1121026 A -2M-7758 107400 10797 115807 115799 120-184 117924 117311 13623 1 120441 1 1 No. Used in Set Description 1 107360B 1 107244 131225 115713 115808 115809 115810 117929 132293 131145 131403 1 2 131397 1 1 Five Inch Electrodynamic Speaker. Less Output Transformer..._._r..._...... 1 VIBRATOR UNIT Plug-in Vibrator Unit...... 1 AND TUNER PARTS Dial Scale __.. Escutcheon Set of Station Call Letters...._ ..__ .... Knob-For Tuning and Volume__ .... Shaft for Volume Control.___...___ __....._._.. Pushbuttons Pointer String for Pointer 1 ._._. 1 1 2 1 4 1 Tension Spring for Pointer String__.__. Diffuser for Dial.._.____._.____._.._..___._....._. Snap -in Rivet to Fasten Diffuser_ Socket Assembly for Pilot Lite..._........._. 6-8 Volt Lite. Type T-51... _____ .._.......... Pushrod-For Pushbuttons -..__....._.....__.... "U" Cam-With Set Screw..__...._.._._...._... Return Spring-For Pushrods__-._.___ Tuning Shaft Pinion Gear-Drives Crown Gear_ __ Drum Assembly Complete with 115800 Tension Spring for Slug String. ............ _ Antenna Cable ___..................................................., Ammeter Cable _......__._..._ ...............................__......... Fuse -14 Amp.-Type SFE .................__..._....... Mounting Strap Bracket...._.._....__.._ .................. Case Mouning Bracket-Left..._......_ ................ Case Mounting Bracket-Right ............._....._.. Case Mounting Bracket-Short Left..__ Mounting Spacer No. 10-32 x % Fancy Head Screw Flat Steel Washer-For Above Screw_ Extruded Washer for Chevrolet 1941-42-46 Extruded Washer for Dodge-DeSoto -Plymouth-Chrysler 46 13625 Power Transformer Output Transformer for Speaker._ 1 1 1 1 1 2 1 1 4 4 4 1 1 1 MISCELLANEOUS 1 TRANSFORMERS B -12C-10236 T4 12629 1 _........._._..._....... 1 Output I.F. Coil_......_...._._..__..__...._........__.._........ Permeability Tuning Unit Complete with Ant, and Ose. Coils_ ..... "A" Choke No. 16 Wire-.-.___....-..._.__... "A" Choke No. 18 Wire______...-_... __ B -18B10236 1 -10%._2 COILS InputI.F. Coil_.._..........._._._.._..._ T2 T3 108211 10566 10568 . 1,4 KC CATHRODE OF THE 6SK7 IS GROUNDED 1 1,4 R2 R3 R15 R13, R14 R4 R5 108139B RESISTORS 4.7 Megohm, % Watt -20%.___..__.........._...... 220K Ohm, 1,4 Watt -20%-__....._...__ 470K Ohm, % Watt -20%-_ _...... ........._.... 680 Ohm, Watt -10%._._._ 3.3 Megohm, 14 Watt -20% _....._ 47K Ohm, 1 Watt -20%.-_..._._ 1 Megohm, 1 Watt -20%.-___._....-_...._.._ 33K Ohm, 1,4 Watt-20%.--__..____... .._ 15K Ohm, 1 Watt -10% _.-...._..._......_ 1500 Ohm, 1 Watt -10%-.- _..._..._.......... 100 Ohm, Watt 150 Ohm, % Watt -10%-.__._.._.._..._.._ ......_.. 330 Ohm, y Watt -10%.-._ ... R12 R6 R7 455 PEAK SPEAKER C9 .02 x 400 Volt Tubular_.__..__.__._._.._.._ 1 C13 .01 z 600 Volt Tubular 1 C6 .05 x 400 Volt Tubular_-___._.__._ 1 C7 .1 z 200 Volt Tubular 1 C5 .05 x 200 Volt Tubular-__._-.._._..____ 1 C14 .0035 z 1600 Volt Tubular_._..-.. 1 C11 .002 x 600 Volt Tubular 1 C15, C16, C17.6 x 120 Volt Oval Type 3 C -9B1-35 TUBE FILAMENT) FUSE (IA AMP) CONDENSERS 100-26 100-87 100-13 100-20 100-9 100-125 100-25 100-31 100-81 100-82 119-105 TO (SWITCH ON VOL CONI) 131-50 Rider www.americanradiohistory.com 1940-41-42- 1 1 1 1 1 1 1 6 2 2 2 ---2 Complete Kit of Mounting Hardware Including Brackets, Condensers, Screws, etc. Buzz, Clips-for case ............._..........._.._.__.10 . PAGE 17-2 GAMBLE 1,lODEL 43-5005 GAMBLE-SIWGMÓ, INC. TUBE SOCKET 121210-5 REO, VIBRATOR CLAMP 104 295 1262 POWER TRANSFORMER 119105 6K6GT B -12C-10235 108-1398 LYTIC FUSE ENCLOSED /131225 108211 6SK7 6SQ7 OUTPU eI.FQ DUAL GOND 124187 455 KC 6SA7 C i 101276 10025 AMMETER CABLE 107244 002 MFD 600 VOLUME' I-A CON&SW. SHAF T 115 DRUM ASS EM. 1362 3 860 ANTENNA CABLE 1073608 TUNING UNIT C-211-10961 PINION GEAR 117311 TUNING SHAFT 117924 SPRING L LOCKING 120184 SCREW -4 REQ 132113 ALIGNMENT PROCEDURE (Refer to Chassis View) Volume control at maximum for all adjustments. Output meter across 3.2 -ohm output load. Align for maximum output. Reduce input as needed to Connect ground post of signal generator to radio chassis. keep output near 0.4 volts. BAND Frequency SIGNAL GENERATOR Connection Dummy to Radio Antenna Pin #4 Ground Connection ADJUSTMENT Adjust for Max. Output I.F. 455 kc .1 mfd. Grid 6SK7 Tube Chassis Adjust Trimmers of T3 output I.F. I.F. 466 kc .1mfd. Grid 6SA7 Tube Pin #8 Chassis Adjust Trimmers of T2 input I.F. Broadcast Band 1600 kc 301nmfd. Antenna Lead Chassis Adjust Trimmers Cl -B Oscillator and Cl -A Antenna. Broadcast 1400 kc 30 mmfd. Antenna Lead Chassis 'Slide Antenna Coil lengthwise for max. output by means of a screw driver. -Broadcast Band 1600 kc 30 mmfd. Antenna Lead Chassis **Adjust Antenna Trimmer Cl -A to maximum output. Band as 'This adjustment will seldom be necessary in service work the Antenna Coil is adjusted and sealed In place at the factory. by quickly The necessity of this adjustment can be checked tuning set to a 1400 kc. signal and adjusting Cl -A. If a large increase in output Is noted the Antenna Coil should be ad- justed. ©John F. "If Antenna Coll is adjusted, Cl -A should be readjusted at These two adjustments (Antenna Trimmer Cl -A and Antenna Coil) should be repeated until no further improvement is noted. NOTE: At 1600 kc., the Oscillator Core should extend 31/33 Inch from the edge of the Coil Form. 1600 kc. Rider www.americanradiohistory.com GAMBLE PAGE 17-3 GAMBLE-SKOGMO, INC. m Ì b VJ p q II.,II.,{ ^ 4176 bb F. 43-5005 w X .b.mú' `"EóoF>aÿaÁa9Oam.a N oÿa pl..l F a goa'm m'mF. 0 N áb ,.yú ax gee ~4c omQ3olC,oHao03 a ÿ Q ^>fppo :amq0t Edrp wyM,r 3 5 "2.:eo4 w . oo'+C. m d E a O U3.0 wE qm fO bm }.4,M : 0,) i mb MODEL ¡ .N M m d a' m o o d C 0).0-1 d d OD m F O a>,y 1b+ moC Á o ° E , 44 p ê O a °o ?W17p a,a v o: ß ea°V0 02o =Ea$4 óaQ' j á ób,,D'wâao my Q o O 64 :Mg 8 5,- a, a a.iEO ah q a ú yB Ó w .a ú y R o o .A VÑo mm ' 0 us 443 y (IS g. p C >+. p E ama OM C ovm u ° ¡z o .$.E.Eam ¢ P. om a m ó ti_> N 6 0 02 NO e o q a+.m m maÓaK 4wqdEúpE p m.m o >4.%3 Wo ú ÿL oGLm Cr 0. CópÓmp.úaC á>.WmamamrE aoCo m^ms o.' wo>,m oo a tcéaE o s.;,+ ° o.``) aam ÿ v S. a' o a r3 N3 NN N3 cc, CO a'o co co 0O O 0 N0 01 . N - CD CS Y ó W m (3) p w'm NO U r*1 (-) ,' 0 O< tA lS, . 0 ca >4) Ek. aU , o o á'3Eó óBádÿv m:' bovi, Ério,,.C.e. °a ñmc* co 00 moa C ÿ ;=dWeeEgA3 Eo/+r.e >o.3 oaa.:EvO a mowd a .cm. 8, c".5 2 c /..dN.+ O' amOaÓ% gig á y e$AgAEmáw?ti 1 ó.aa. ñ3Qá XEpg .nÑaA m-oa E'°o mF3 ocoe -îv oo'i ó g"v mBoq O G3 mam ore so aa00 d ÿÿ pÿ" aVEú-'dpá o w 2Ó 3u~: ú'^ á ól á92 áan°.o "g áeg..,9 +ex y I" gßa3mya°o_ oimá O.01 o >qV 5m 8.é at WM pA 5çv .ó'p q eqw a 33 .0g0pmog ,G p AamE .+Gego á N m .,_- 8.. Ep.wJ..r.dm. qo" O .m.:m f F. nEo 0, Cn v O _131. o F. co F eân m E Op á O O O a y>g @1:mN H V0 O a íi 2ó +Ióa+$BmpóWmámQJ m m y gá.î,1 °*á O ,,MoÿO cQ Á? Fi ...^ .. 7O O Ñ N m. d.cEu oOf aov O+gi. 'woe m +r'..4' w. ? Z t2OmT Oa,,iOOleO óW , Odm~W°~ó^O Q m NJ m dá O N 00 íçC) -O l' O O-a o c0 ÑP o / LA '. O e ° ''N ó ú ti. C1:101; OO _ o: O U^ (0 ; 3 I O Ú o>O r Q9-1 MaO 73 -- 0000 0 d ZC)d'c0 . h W C`")d' Md' C`') c% o Ú -.- x o pr ö 8 O O i n O la N a) ó a) Ti O oIsU° Ç Fa. nI< C7 0 f.. !1 o l a°'i ;El U V QQQJ R 700.;-6-110 . O 2g A U4)G m o w Gci zYo o El ö C3o.ºa d u v 7 O ö a0) C7 pWg D o ó t7 oN - U 0 >~ a) a w"~ ö Ñ> f a) U a) U a (.5 ~ ] a) U) ö Ñ Ó h, E Ú.,ó U a) O "" o U CT t3 S~ m UO ö a) 2 3 rön Á Ñ'.---- a) TS 27 ö - a) 0 á) CO ö .óg Óy a) ó ó o Rider www.americanradiohistory.com Ú) w w Ó .c)ó fZ a a) t50 -z:30(21,.. >. a) >Ú ö o F-, á) . óa)öEmu,2 Ua U C ' - O t-S ,E Uö 0 0 °' a) H O E. > O a) O. m20 p .J ó E~ 3 ü EÁ ö O ám O O N O > `.2 s~ Ç3 (p .Ja(1) g 2 ö - c r) o w Ó )-' O t~ ö Q -a KC p 2 Ñ> Z Oi11_ -aoaa) áz~ : ó,. o-dd U aº . _ ó s~ 7 C 0º ZO (> U 0 0 t7 0,-i, .a Ñ - O á 5O 'Dry, OI ce á. . ó Ñ2 Óz > Ó O C7 3 E-- Ó> ü Ú Ó O sFá. Fa - Ç3 >~ -r-* ; . do ,¿ öp 3 b ú Z ö~03> a .aºó0á. . o 0 F. P WO ú ., . (i) o7 .4A iU" a o > 3 Q ö ©John Qº' o tT , d o ° w3 0 w á x z ta C á. en á. ö Yo TM -ó E Ñ ó áo oo t1 KI 0 F,a. 2 4Z+ O ga C'3 1 > o óo E- d` b Ñ o. w .U m > a ,,,. -º' Z w2ö 3 6E , , s 0 j ti~u m o Z ü ö, 3 o Ci. O CO CO x óf ( a) (2-. Z a) wÑ -º N > Q. GAMBLE PAGE 17-9 M6nL 43-6301 GAMBLE-SKOGMO, INC. 70-122 TENSION IA7 TUBE MIXER 11-193 POINTER RAIL 58- 52 SPRING 68-18 SOCKET (4) POINTER INS TUBE 79-335 -I ST I.F. 10-417 2ND I.F. IH5 TUBE DET-AUDIO 35-3 GRID CLIP SPEAKER (3) 80-218 SPKR. ¡O-416 IST I. OUTPUT TRAN 3Q5 POWER OUTPUT 69-164 BATTERY SWITCH F. 19-185 VARIABLE II -233 CONDENSER BRACKET 84-26 BATTERY CABLE 10-414 ANTENNA COIL ALIGNMENT PROCEDURE Volume control maximum all adjustments. Connect ground lead of signal generator to chassis. Connect dummy antenna in series with output lead Connect output meter across voice coil of speaker. Variable Condenser Setting Generator Frequency Minimum Capacity (Fully Opened) 455 K.C. Minimum Capacity (Fully Opened) 455 K.C. Minimum Capacity (Fully Opened) 1725 K.C. Tune in Signal From Generator 1500 Dummy Antenna signal generator Connection to Radio Trimmer Adjustment Trimmer Function Grid of IA7GT Tube Two Trimmers on top of T2 Output .1 Grid of 1A7GT Tube Two Trimmers on top of Tl Input .1 Mfd. .00025 .00025 K.0 of Antenna Lead Antenna Lead CIB (on gang) CIA (on gang) I.F I.F. Oscillator Trimmer Antenna Trimmer Frequency Range With an output meter connected across the voice coil of the speaker, the output meter reading for 50 millwatts is 4 volts using a signal which is modulated 400 c p s ©John F. Rider www.americanradiohistory.com 535 to 1725 I. F. Frequency K C. 455K C. ?AGE 17-10 GAMBLE MBLE-SKOGMO, INC. 43-6301 P::ODEL 58-52 POINTER 67-483 GLASS DIAL SCALE 83-277 DIAL RETAINER 97-60 MOUNTING SCREWS 42-383 52-182 79-335 CABINET KNOBS (2) SPEAKER 74-174 MTG. SCREWS (4) 69-164 BATT. ECONOMIZER SWITCH 74-173 CHASSIS MTG. SCREWS (2) 84- BATT. .002 I 26 MFD 600V CABLE .01 MFD PLUG ------- 8t 400V MEG OHM I/3 WATT VOL. CONTROL a 400 OHMS 1/3 WATT 470 K OHMS 1/3 WATT .75 OHMS I WATT i ln DRIVE CORD REPLACEMENT SWITCH A24-165 ,01 MFD. 400 V 4.7 MEG OHM C 1/3 WATT 250 MMFD 500 V .05 MFD 200 V .05 MFD 200V Turn gang condenser to fully open position. I se a new drive cord and fasten one end to tension spring. Fasten the other end of the tension spring to the hook on the drive pulley. Pass -the drive cord through the slot in the drive pulley rim and continue over the top of pulley counter-clockwise completely around through the string guide, around pulley B, over pulley C, around idler A counter -clockwise two times. Pass cord through slot in pulley rim, stretch the 'tension spring and fasten free end of cord to the spring. 2.2 MEG OHMS 1/3 WATT TERMINAL STRIP A76-4 .I MFD. 47 K OHMS 1/3 WATT 200 V OSCILLATOR COIL A10- 415 1.111 4 MFD. 150 V ELECTROLYTIC 220K CIRCUIT DESCRIPTION OHMS 1/3 WATT 50 MMFD 500V .02 MFD 400V TUNING SHAFT A84- 35 Th a receiver is a tour tube battery operated sunerhetrodyne The battery used is of the combination "A" and "B'" type, with for filament current, and 90 volts for the high voltage 1/4 volts I circuits. The tubes used, and their circuit application are as follows I -1 A7GT-Oscillator converter 1-1N5GT--l. I WASHER A86-51 ©John F. F. Amplifier 1-IH5GT-AVC, Detector, Audio Amplifier -3Q5GT-Power 0,:;put CHASSIS BOTTOM VIEW Rider www.americanradiohistory.com ÏN. GAMBLE-SKOGMO, 12SA7 May 1, 1947 GAMBLE PAGE 125K7 17-11 43-8177, 43-8178 MODEL 43-8179 MODELS 12507 5CL6GT T L3 5 04 C;15 r LI C19 R12 B C20 7^C2A AVC C2B 35Z5GT 5 12507 SI IF PEAK 455 KC 7 12SK7 7 CI 125A7 501_6GT D3 MODEL 43-8179 PoI MODELS 43-8177, 43-8178 5.!6T 2507 r e6 L4 DCB 7 3525G1(G 1 35Z5CT/IG S.fiGT QSG7 I¢ C2AI le 1251[7 9 TUBE AND TRIMMER LOCATION EXTERNAL ANTENNA SOCKET VOLTAGE DIAGRAM LI FRONT OFCHASSIS RII,==,(1J3.___) 35Z5GT/G IST LE G VOLTS AC LINE NO SIGNAL INPUT VOLTAGES MEASURED BETWEEN SOCKET TERMINALS AND B- WITH 20,000 031 PER VOLT METER VOLUME CONTROL MINIMUM - INDICATES AC VOLTS 117 17 G TRANS. L2 2ND IF G G TRANS L3 Ti ANT. C9 12507 CIOA I2SK7 12SA7 24iF OSO B5 -5A CII Cloe BOTTOM VIEW OF CHASSIS ALIGNMENT PROCEDURE Allow unit to heat for a few minutes before starting alignment. Volume control set to maximum. Output meter across speaker. Align for maximum output. Reduce input as needed to keep output near 1.0 volt. FREQUENCY SIGNAL GENERATOR COUPLING CONNECTION CAPACITOR TO RADIO 455 KC 0.1 mf 1725 KC 200 mmf 1500 KC 200 mmf Note: If signal generator is AC operated, use an isolating transformer between the power supply and the radio receiver power input. The use of an isolating capacitor is not recommended as AC through the capacitor will introduce hum and/or create the possibility of a burned out signal generator attenuator. GROUND CONNECTION TUNER SETTING ADJUST TRIMMERS FOR MAXIMUM OUTPUT (in order shown) Converter grid B- Wide open 2nd IF transformer trimmer 1st IF transformer trimmer Receiver antenna post B- Wide open Oscillator trimmer Cll. Receiver antenna post B- ©John F. Rider www.americanradiohistory.com Tune for Antenna trimmer maximum output C9 PAGE 17-12 GAMBLE 43-8177, 43-8178, 43-8179 MODELS GAMBLE-SKOGMO, INC. CABINET SAU -014(MÁ[email protected] SAU -015 (IVORY) -7 / KNOB, TUNING .SDK SDK -005 (MAHOG.) -006 (IVORY) KNOB,VOLUME CONTROL ('egto)y' y..,.. SDK-OOT (MAHOG.) SDK -OOB(IVORY) METAL GRILLE SAG- 001 (FOR MAHOG. CAB SAG -002 (FOR ) IVORY CAB.) SPECIFICATIONS tube Superheterodyne, including rectifier tube Intermediate Frequency 455 KC Antenna Sensitivity 89 mv. average for 0.5 w output Selectivity __ 70 KC broad at 1000 times signal at 1000 KC Power Output 0.8 w undistorted, 1.5 w minimum full power output Frequency range 540 to 1720 KC 5 .^ATALfki NO. UCC-045 SCE -003 SCE -003 UCC-041 UCU-i040 UCC-040 UCC-039 UCU-1040 s s UCC-045 UCC-039 UCC-045 URE -007 URF-053 URD-029 URD-113 URD-105 L1RD-145 SRC-004 URD-129 URD-081 IIKD-041 SYMBOL Cl C2A C2B C3 C4 C5 C6 C7 C9 C10A C10B C11 C12 C13 C18 R1 R2 R3 R4 R5 R6 R7 R8 R9 Rll Ll SLC-001 L2 L3 L4 SRC -O34 Tl S1 s SPKR SJS-002 SMS-003 Tuning Direct drive-2 gang condenser Power supply 105 to 125 Volts, AC or DC Frequency on AC 40 to 60 cycles Power Consumption 28 watts at 117V. Speaker 4 inch "Alnico 5" Magnet Dynamic, voice coil impedance 3.5 ohms (400 cycles) Antenna Self contained loop antenna, also provision for external antenna VALUE RATING TOLERANCE .05 mf 600WVDC +40 - 15% 40 mf 150WVDC +100 - 10% 40 mf 150W VDC. +100 - 10% .02 mf 600WVDC ±20% 330 mmf 500WVDC ±10% .01 mf 400WVDC ± 20% .006 mf 600WVDC +40-15% 330 mmf 500WVDC ±10% TITLE Paper Capacitor Electrolytic Capacitor Electrolytic Capacitor Paper Capacitor Mica Capacitor Paper Capacitor Paper Capacitor Mica Capacitor Antenna Trimmer Variable Condenser ant. section Variable Condenser osc. section Oscillator Trimmer Paper Capacitor Paper Capacitor Paper Capacitor Carbon Resistor Carbon Resistor Carbon Resistor Carbon Resistor Carbon Resistor Carbon Resistor Volume Control Carbon Resistor Carbon Resistor Carbon Resistor Antenna Loop 1st IF Transformer 2nd IF Transformer Oscillator Coil Output Transformer Power Switch with R7 4" PM Speaker Socket -Octal base tube Speed Nuts-for fastening metal grille in cabinet .05 mf .005 mf .05 mf 22 ohm 1500 ohm 150 ohm 470,000 ohm 220,000 ohm 10 megohm 500,000 ohm 2.2 megohm 22,000 ohm 470 ohm 400WVDC 600WVDC 400WVDC W 2 W 'f W z W % W 'fz W % % 3fz W W W ±20% ±20% ±20% ±20% ±20% ±20% ±20% ±20% ±20% ±20% ± 20% ±20% ADDITIONAL PARTS FOR MODEL 43-8179 UCC-039 UCC-048 UCC-040 URD-113 URD-113 C19 C20 C21 R12 R13 Paper Capacitor Paper Capacitor Paper Capacitor Carbon Resistor Caz bon Resistor .005 mf mf .01 mf .1 470,000 ohm 470,000 ohm *See listings on pictures ©John F. Rider www.americanradiohistory.com 600WVDC 400WVDC 400WVDC W ít, W ± 20% 20% GAMBLE PAGE 17-13 43-8177, 43-8178, 43-8179 GAMBLE-SKOGMO, INC. BACK COVER FOR CABINET SAB -003 MODELS ANTENNA LOOP SLL- 002 RESISTOR URD-041 CAPACITOR UCC- 040 TEE PINS SMF-0 03 TRANSFORMER 2ND I. F. STL-004 SPEAKER SOP -001 OUTPUT TRANSFO MER STO- GANG CONDENSER 00 4 SCT- 005 35Z5GT/G 50L6GT POWER CORD SWL- 001 12SA7 TRANSFORMER IST I. F 12SK7 STL-003 ©John F. Rider www.americanradiohistory.com 12SC7 17-14 LAMB MODEL 43-8180 January 15T CAMBLE-SKOGMO, INC. 1947 12507 125K7 125A7 MOD I AMP F. A VC DOT - 5CLeGT LL AUC 120 Ige& --ID 00d)05 C3 22N 2 1 1C CND 05 e 3 CJ 7- . RR . `T6 q 1 OIleY Oü R! o d 004 10 MEG C6 RI V 2 K!C R2 IS MEG 1 ® 10 R CII '. 0001 Z éd.YC.3 CO IF » e A qI T2 R/ (::°s511C b G 1OR HWN9 © Q` TI r IT R6 2 PEAK 455 2 C2 M _ Ill y 'r AO KC TUBE SOCKETS ARE VIEWED FROM UNDERSIDE OF CHASSIS VOLTAGE READINGS INDICATED AT SOCKET TERMINAL ARE TO CHASSIS WITH 1000 OHM PER VOLT METER WITH N NO SIGNAL ON VOLT LINE WHERE NO VOLTAGE IS SHOWN, IT INDICATES ZERO VOLTAGE OR A VERY LOW READING ALIGNMENTEACH MDE AT ME FREQUENCY SHOWN AT TRIMMER 6E CONDENSERI CAPACITY VALUES ARE IN MICROFARADS 1000 R. " _ .+ ' SW ON VO COME Ca 117 V 60A/ T2 OSC. COIL CONNECTIONS O A G \ 4^ RECT R.7 M¡, `I Y sR 7 7 "'-' ' nLOT LIGOT T` CT,. .11 ODE PART DE:CRIPTION NO ND R10 A WATT RESISTOR 22 e 9 I.2 10 K IS MEG RIO 2 DESCRIPTION 00025 .00005 .0$ NED. I I/3 IN- 272 C 10 19- 177 19- E90 1 CONDENSER "0 2 GANG 6 MES. ISO V. WV Y D. 10.369 IO -310 LIOP ANT/NN. CSGIL.ATOI CO1. IST äääää FGRMER 2ND IF TRANSTORM(R T5 RO 212 OUTPUT TRANSFORMER USE: I .I. ALIGNMENT © ELECTROLYTIC I M.V. R C12 $2- D'SCRIPTION IO- 394 I /3 " ALSO CII MI ARLE170CONDENSER ELECTIIOLVTIG PART NO 12 T " TUBULAR CONDENSER , 200 05 . C9 C - 004 CB MATT MICA 00V. CODE .01 Cl wATT MATT MED .0001 C5 C6 K 27 1000 7 I C NO. C - 120 6 C PART 03 R 70K 5 R I. 2 2 2 3 N 900011M CODE B TO 79-339 79 -SOSA 4.153 II M 5 P r SEE AKER WIT. SPE AAER SCOR OHM vOLUME ST,. 7%.30,155M ASO' 2240011.51 CONTROL RITA 711101% SW I T PROCEDURE GENERAL: EQUIPMENT NECESSARY: Signal Generator Output Meter .1 MFD. Condenser .00025 MFD. Condenser, mica Insulated Screwdriver ALIGNMENT FREQUENCIES 1. 2. 3. 4. 455 1630 1400 1.F Osc Ant. K.C. K.C. K.C. Connect output meter across voice coil of speaker. Adjust volume control to maximum. Keep output from signal generator at lowest possible level to prevent A.V.C. action from interfering with Correct alignment. With the output meter connected across the voice coil of the speaker the output meter reading for 50 milliwatts 5. is .4 volts. Repeat alignment procedure as a final check. CAUTION: This is an A.C.-D.C. type receiver and when aligning the set it Is necessary to isolate the signal generator or the receiver from the line by use of a transformer or by placing a .2 MFD. condenser in both test leads of the signal generator. Dummy Trimmer Trimmer Variable Generator Adjustment Antenna MFD. Connection to Radio Frequency Function Condenser Setting 455 K.C. 0Stator of Ant. Minimum Capacity .1 section of gang T3 -T4 I.F. (Fully opened) Minimum Capacity 1630 K.C. .00025 (Fully opened) "Ant. terminal on loop C11 Osc. Tune in signal from generator 1400 K.C. .00025 e. Ant. terminal on loop C12 Ant. *Connect ground side of signal generator lead to chassis. **Connect ground side of signal generator lead to terminal marked "G" on back of the loop. 72",./....,...,5,9e....4 /74,/,../ DRIVE CORD REPLACEMENT - - .Jrv,../.4. r!/,.¢ j.AFT ©John F. Turn gang condenser to fully open position. Use a new drive curd and fasten one end to the tension spring. Pass drive curd through slot in the drive pulley rim and continue over. top of pulley and counter -clockwise around pulley to turning shaft, wrap around 21/'' turns, fasten free end to cord tension spring. Cross over cord before fastening. Rider www.americanradiohistory.com , GAMBLE PAGE 17-15 SCREWS 10) 74-133 POINTER 58-31 CHASSIS MOUNTING SCREWS (3) 74-139 40 MF 150 V A18-280 AND 20 MF 150V A18-272 411 it/ ir.A..w1. -004 MF Witatar 400 V NOTE TUBE SOCKETS FOR 12SA7,12SK7 (2) 68-16 TUBE SOCKETS FOR OTHER TUBES (3) 68-11 ©John F. Rider www.americanradiohistory.com PAGE 17-16 GAMBLE MODEL MODEL 43-8180 43-9196 GAMBLE-SKOGMO, INC. LOOP ANTENNA 82-30 \ 50L6GT 12 SK7 INPUT I. F. 10-369 I2SQ7 i ( 12SA7 4.040,0 TUNING CAPACITOR 19-177 ,PILOT LIGHT BRACKET 87-21 PILOT BULB LIGHT A89-7 "'DIAL POINTER 58-31 a.r TUNING SHAFT 75-41 VOLUME CONTROL AND ON-OFF SWITCH SPEAKER 879.339 24-153 OUTPUT TRANSFORMER A8O-224 SPECIFICATIONS Power Supply Power Consumption Power Output (with Frequency Range Speaker 117 V. AC or DC 50-60 cycles 30 W V. input) undistorted 86 W 540 to 1630 Kilocycles 5" P.M. 80 kc. broad at 1000 times signal at 1000 kc. Hazeltine method 600 kc., 1000 kc.. 1400 kc., 117 Selectivity Sensitivity Tuning Intermediate Frequency 160 mv., 110 mv., 98 mv. 540-1630 kc. 455 kc. 40 MFO. 150 W.V. WVI BLUE 20MFp. BLACK fOMM!:N NF RED ©John F. y Rider www.americanradiohistory.com OUTPUT 10.370 I. F. GAMBLE PAGE 17-17 GAMBLE-SKOGMO, INC. LäODEL 43-8213 608 CABINET 25X1527 DIAL MTG. BRACKET 58X614 DIAL 14X385 GRILLE CLOTH 10A297 KNOB (2) 14X348 ME 28X95 28X292 SNAP BUTTON / 26A390 LOOP ANTENNA 19X432 35Z5GT TUSE TAI' GRILL SPRING 25X1382 IDLER BRACKET I 14A179 GANG C WITH PULLEY FLAT WASHER 57X176 MOUNTING PLATE 12SA7 TUBE 17A123 TRIMMER 26X482 DRIVE SHAFT 19X192 "C" WASHER 12SK7 TUBE 10X36 DRIVE CORD 28X265 GROUND PLATE 28X512 GROUND SPRING 9A1809 2ND TRANSFORMER I -F C. .001 MF 9A1808 1ST -F TRANSFORMER I 400 15X228 POINTER V #47 PILOT 13X328 LINE CORD AND PLUG ASSEMBLY 12SQ7 TUBE 32X365 ANTENNA SHIELD 50L6GT TUBE OUTPUT ©John F. Rider LIGHT 7A194 PILOT LIGHT SOCKET 25X1470 HOLDER LIGHT DIFFUSER 41X74 DIFFUSER 24X446 IDLER PULLEY 2.5X1493 POINTER BRACKET 20X268 RIVET For schematic and additional data see pages 15-1 and 15-2 www.americanradiohistory.com PAGE 17-18 GAMBLE MODEL 43-8213 GAMBLE-SKOGMO, INC. #8 X 1/2" O-- 19X127 P.K. TYPE "Z" SCREW WASHER 51X122 OUTPUT TRANSFORMER 36X32 VOLUME CONTROL AND SWITCH C. .01 R. 6.8 MEG. 1/2 W . R. i 2.2 MEG. 1/2 W 220 MMF 500 470,000 20% 1/2 W 47X112 R. 50-50 MMF 300 47,000n.1/2 C. .2 200V V 25X1492 IDLER C. V 470,000.n 10% 1/2 W C. . MF 200 BRACKET 45X341 V ELECTROLYTIC C. 50 MF - 150 50 MF - 150 W V V MF f 12A440 SPEAKER 10-30% 44121 941805 OSC. COIL TERMINAL STRIP R. 220,000n1/2 R. 39,000n.1/2 30X148 LINE W ' 6X21 RUBBER' GROMMET 20X329 STUD CORD C. .05 MF 200 V CLAMP C. 47 MMF 500 V 4A122 TERMINAL STRIP R. 27n. 1/2 LIMO 4489 TERMINAL STRIP W C. 3A303 TUBE SOCKET ©John F. Rider www.americanradiohistory.com .1 MF 400 V GAMBLE PAGE 17-19 MODELS 43-8240, 43-8241 GAMBLE-SKOGMO, INC. DECEMBER 30,1946 7 /EXTERNAL ANTENNA 12SA7 CONVERTER 025K7 ,çç V t F 12S07 2N D. DET AMP 5OL6GT OUTPUT AVC 9 IST ^ODIO O ® RI VOICE COIL 3.2 011M3 105 TO 125 VOLTS AC -DC Note: Some sets of this model were built with a 2 -section electrolytic con40-mf section (C13) and a 20-mf section (C12 or C14). denser -a CONDENSERS C Cl C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 2 -gang variable .15 x 400 volts Oscillator trimmer on gang Antenna trimmer .0002 mica .05 x 200 volts .1 x 400 volts .05 x 200 volts .0001 mica .002 x 600 volts .0005 mica .004 x 600 volts Electrolytic, 20 x 150 volts C13 C14 C15 C16 Electrolytic, 40 x 150 volts Electrolytic, 20 x 150 volts .02 x 400 volts .002 x 600 volts R10 R11 R12 R13 Rl 1000 ohms, 20%, 1/2 watt 47,000 ohms, 10%, 1/2 watt 220,000 ohms, 20%, 1/2 watt P1 RESISTORS R2 R3 R4 R5 R6 R7 R8 R9 watt 3.3 megohms, 201, 1/2 watt 22 ohms, 101/0, 1/2 watt 47 ohms, 10%, Volume control, 1 megohm 10 megohms, 20%, 1/2 watt 470,000 ohms, 20%, 1h watt 0 8 Antenna Intermediate ©John 35 w. undistorted, w. 1.5 w. maximum 52 kc. broad at 1,000 times signal at 1,000 kc. Selectivity Built-in loop, Frequency F. 33 ohms, 20%, 1 watt MISCELLANEOUS Pilot light, 6-8 volts On -off switch on volume S1 control Loop antenna assembly Oscillator coil Input I.F. coil Output I.F. coil T1 T2 T3 T4 T5 T6 Output transformer 5 -inch P.M. speaker SPECIFICATIONS Tube Superheterodyne, 'including rectifier tube Power Consumption 6 Power Output 1/2 680,000 ohms, 20%, 1/2 watt 150 ohms, 10%, 1/2 watt 1200 ohms, 10'/0, 1 watt also provision for external antenna 455 kc. Speaker Tuning Sensitivity Frequency Range Power Supply Output Transformer Rider www.americanradiohistory.com 5 in. 0.7 oz. P.M. voice coil imp. 3.2 ohms Two -gang capacitor for 50 mw. output 530 to 1,650 kc. 105.125 r. D.C., 50-60 cycle A.C., also made for 25 cycles 30 mv. avg. Impedance ratio 2,500:3.2 PAGE 17-20 GAMBLE MODELS 43-82401 GAMBLE-SKOGMO, INC. 43-8241 A -CANNOT BE B-12 VOLTS MEASURED WITH VOLTMETER A C ACROSS PINS 13-48 VOLTS AC ACROSS PINS 7-8 2-7 E-27.5 VOLTS AC ACROSS PINS 2-7 C-12 VOLTS AC ACROSS PINS F -I17 VOLTS AC ACROSS PINS 50L6GT 85 ALL VOLTAGES MEASURED BE- 2-7 TWEEN SOCKET PIN & B- WITH A 1000 OHMS PER VOLT VOLTMETER. 117 VOLT LINE. 2-4 35Z5GT 12SQ7 90 0 A 90 0.8 0 B 12SA7 12SK7 BOTTOM VIEW OF CHASSIS CHASSIS VIEW DRIVE CORD REPLACEMENT C2 OSCILLATOR TRIMMER ON SIDE OE GANG 33" Required ®® 35Z5GT APPLY GL U£ C3 DIAL 12SK7 ANTENNA POINTER 12SQ7 5OL6GT TRIMMER After installing cord, tuns in station of known frequency. Then attoch point r in proper EXTERNAL ANTENNA position along dio Pointer must slop at lost marker shown above. CL tP . ALIGNMENT PROCEDURE Connect ground post of signal generator to B- of radio through a .1 mfd. condenser. Connect dummy antenna value In series with generator output lead. Connect output meter across primary of output trans- No aligning adjustments should be attempted until all other possible causes of trouble have been checked. The loop antenna should be connecteQ to the radio and in its proper position during all adjustments. Turn volume control to maximum (extreme clock -wise) for all adjustments. Signal Generator Frequency Setting 455 Kc. former. Antenna Connection to Radio mfd. Grid of 12SK7 Dummy .1 Tuning Condenser Setting Rotor full open (plates out of mesh) 455 Kc. .1 mfd. Grid of 12SA7 Rotor full open (plates out of mesh) 1650 Kc. .1 mfd. Grid of 12SA7 Rotor full open (plates out of mesh) 1400 Kc. Broadcast None See note below Note: Lay output lead of generator In back of loop antenna. Turn up generator output. ©John F. Rider www.americanradiohistory.com Set dial at 1400 Kc. Adjust for Maximum Output 2 trimmers on top of output I.F. (see chassis view) 2 trimmers on top of Input I.F. view) Oscillator trimmer (see chassis C2 on gang (see chassis *view) Antenna trimmer C3 (see chassis view) Loop antenna will pick up energy. AMBLE GAMBLE-SKOGMO, INC. 3.3 MEG %a SWITCH & 1MEG. VOLUME CONTROL 101265 PAGE MODELS 4 n i1ï 1 9:3-8, 17-21 43-8240, 10 MEG W 1200.1 119-135-B v2.7,000n- 20MF 20AdF 40MF X 150 ----I' V 22 W. n TUNING SHAFT 117919 100 MMF 500V .05 MF 200V .002 MF 600 COIL -A05G -13D-10196 , V 4 .02 MF 400V 200MMF _g n 47,000 15C .n. SOOV iW 470,000.n. %W .004 MF 600V OUTPUT TRANS 33rí1 105108D 15MF 400 50OMMF W 47 tL 220,000 V CORD ANTENNA LOCK 131261 TRIMMER 124180 n 4 MOLDED TUBE SOCKETS 121 1 -210 LAMINATED TUBE SOCKET (FOR 125K7) 121-171 .05 500V MF 200 V .1 MF 400 V DWG NO 2091. TUBE 35Z5 PILOT LIGHT TYPE T47 PILOT LIGHT SOCKET 107389 B TUNING CAPACITOR B -8A-10200 TUBE 50L6 TUBE 12SA7 C(iRÓï1 q p 10798 INPUT I.F. 108140 ©John F. TUBE 12SQ7 TUBE 12SK7 LINE CORD N OUTPUT I. F. 108141G Rider www.americanradiohistory.com PAGE 17-22 GAMBLE LICDELS 43-8240, 43-8241 GAMBLE-SKOGMO, INC. CABINET- BAKELITE WALNUT 128658-36 IVORY 128658-9 VOLUME' KNOB WALNUT 128686-37 IVORY TUNING" KNOB 128687 -37 128687- 8 WALNUT IVORY COMPLETE 128686-8 ASSEMBLY. LOOP, RESI STOR, CAPACITOR & BACK.(SPECIFY BACK COLOR) IVORY C -13E-10195 OR WALNUT C-80-10778 .002 C-212-11269 C -9B1- 13 1000 i. _ DIAL SCALE B -6D -10014 / MF BOO V n I31-356 fi DIFFUSER UNDER DIAL A -6D-10017 DIFFUSER CINCH BUTTONS A -2M-7758 DIAL POINTER A -2G-10199 STRING 1209 SPEAKER 114251-B SPRING 120145 491 ©John F. Rider www.americanradiohistory.com GAMBLE PAGE 17-4 GAMBLE-SKOGIVIO, INC. July 1. 1947 12SA7 12SK7 TO 1 I.F.-2NoDET. EXTERNAL ANTENNA 9A1776 4 9A1175 OUTPUT AUDIO Sr1 43-8305 35L6GT 12SJ7 12 SF 7 MIXER R.F. MODEL E d I.F. TRANS GREEN S o . ,,, G' 9a 1T LOOP AERIAL ASSEMBLY TT 1 470,, \ 200705 47 MMF. 1001MMF MF MF. 05 1 2.2 MEG zmó ú OSC. COIL Óó 200e105 47IMMF MF. } 9.VJ05 r 025 MF 8 VOLUME C.DNTRC'. PAINT SPOT 50CK / 3624341 '.1 1 I NOTE: T nr I O4 MF 4. 35Z5GT CHASSIS GROUND ONLY. NOT EXTERNAL. pEc- ÓALL 12SJ7 POINTS MARKED 2 39n pow .--10 = 200V 7 7 TO 2 35L6GT 2 5á+ aSJI 1ec ESJ 0.5 3 I PEAK 455 I sov í RON I F H.F. X ALIGNMENT PROCEDURE The equipment in column at right is required for aligning: accurately Generator, which will calibrated signal at the test frequencies as listed. Output Indicating Meter; Non -Metallic Screwdriver. provide an Signal D12-xl19 F. I TRIMMERS SIGNAL GENERATOR Antenna Frequency Connection Setting 455 KC _J IF. TRANS. 2so Ground Connection Point Control Grid 12S FT - I.F. (Prong No. 2) 12SKT 455 KC 12SAT - 1400 KC Capacitor "X" R.F. (See Trimmer Illustration) 1600 KC 2nd I.F. Trimmers 1 mf. 1600 KC ist I.F. Trimmers mmf. Index Line. Point "X" 12SKT R.F. (Prong No. 5) 50 External Antenna Clip on Chassis 50 1400 KC dial DIAL CALIBRATION ln order to align the receiver, the dial poiroter must be positioned ou the dial string correctly with reference to the dial. Index lines are provided on the dial background attached to the chassis bottom plate for this purpose. To position the dial poiroter, adjust the radio to the "stop" position at the low frequency end of the dial. The dial pointer should be directly over the dial pointer index line. (See Illustration.) If not, move the pointer on the drive cord until it Is directly: over the index line. The 1,900 KC index lines are for use when aligning the receiver. Rider www.americanradiohistory.com background strip. Oscillator Trimmer See Note A mmf. 1400k.0 Index Line. See Note A Loop is on Adjust Trimmers to Maximum mf. Loop External Antenna Clip on NOTE A: Index line Dial Setting .1 Point "X" 12SKT - R.F. (Prong No. 3) 1st Det. (Prong No. 0) 1400 KC Coupling (Prong No. 3) Control Grid ANT. TRIMMER F. sov _____...e ,e,......_ D,9 2252 NOTE A: Index line is on dial background strip. See DIAL CALIBRATION paragraph. ©John SOTMF 45x 344 TRIMMERS TRANS. Q3B[UE T 1 Ist MF CAA,/ ,04 KC 2No iss Q Q 1 OSC. TRIMMER OSC SEC 5+x,15 a GuT Check dial pointer position, see Dial Calibration paragraph. Volume Control-Maximum All Adjustments. Allow Chassis and Signal Generat r to "Heat Up" for several minutes. Dummy Antennas-.1 mf., 50 mmf. F .01MF ow 4.4 35Z5 GT \r, 2o0vxF- 1520' 0 27n 2 ON-OFF T40°v SWITCH PE THIS POINT 47 PILC DRC IF RETURN IDI MF \ A.C.-_ "X" 12SK7 12SA7 12SF7 270K 117V. - I.F. 455 KC COIL See R -F Trimmer Antenna Trimmer DIAL CALIBRATION Paragraph. PAGE 17-24 GAMBLE 43-8305 r._ODEL GAMBLE-SKOGMO, INC. SPECIFICATIONS Tube Superheterodyne, including Rectifier Tube. Speaker 5 -inch PM Dynamic Intermediate Frequency 455 KC Selectivity 50 KC Broad at 1,000 Times Signal Sensitivity (for .05 watt output with external antenna) 15 microvolta average Power Consumption 35 watts (at 117 volts AC) Power Output..1.5 watt maximum, .9 watt (10% harmonics) 6 BOTTOM CHASSIS VIEW 328 LINE CORD AND PLUG 47 MMF 30 X 148 LINE CORD 36X347 13 X I5 K OHMS .5W. CLAMP OLUME CONTROL 27 OHMS V. 1500 OHMS 470 33 .04 MF 200V. 270K OHMS .5W. IW. OHMS K K 4A86 TERMINAL STRIP W, 200 DI MF 006 .5W. .01 OHMS .5W. 470 MME 4.7 MEG. .5W. 82 K OHMS .5W. 470K OHMS .5W. LMF 200 180 OHMS .5W. 45X344 4A178 TERMINAL .LMF STRIP 100 MME 47K OHMS 5W. 39 OHMS 2 W. 3Á42I TUBE SOCKET WITH SHIELD (I) 4A86 TERMINAL STRIP 470 OHMS .5W. 2.2 MEG. .5W. 15 X 227 POINTER 22 MEG. .5W. 51X116 OUTPUT .05 MF TRANSFORMER 26A 470 LOOP 4A92 TERMINAL ANTENNA ASSEMBLY 941805 STRIP OSC. COIL 47 MMF 05 MF 200 ASSEMBLY K V. DRY -ELECTROLYTIC .025 MF 200V. 100 200 V. 200 V. MF MF OHMS .5W. #3 VINYLITE /SLEEVING 39K OHMS .5W. 100 MMF 3300 OHMS 26X464 DRIVE /SHAFT .5W. 9X187 LOOP SPACER 3Á3O3 TUBE SOCKETS (5) (19X 192 "C" WASHER I9X 62 FLAT WASHER 10 X 35 DRIVE CORD ASSEMBLY 2 MF ©John F. V. Rider www.americanradiohistory.com 200 V. GAMBLE PAGE GAMBLE-SKOGMO, IN MODEL 17-25 43-8305 55X258 CABINET #616 264424 GRILLE CLOTH 15X227 POINTER 58X668 DIAL I0Á300 KNOB TOP CHASSIS VIEW Xi #8 P -K " "Z" TYPE 28 SNAP BUTTONS X SCREW 292 FLAT WASHER 19 X 127 10A300 KNOB GANG CONDENSER ASSEMBLY #3 26A402 VINYLITE SLEEVING I2SK7 R -F 12SA7 MIXER_ AMP. DIAL BACKGROUND 58 X 669 POINTER 15 X TRIMMER 17A 123 IgA 439 SPEAKER I -F 941775 IST #6 # 12 LOCKWASHER 6-32 HEX NUT SF 7 I -F #6- 32 ' B.H.M.S. 146 LOCKWASHER,E.T. COIL X 265 AND I- I I X 128 PILOT LIGHT BRACKET 25X 1497 SOCKET 74198 #47 PILOT LIGHT BULB GROUND PLATE 941776 2ND X SHIELD 2ND DETECTOR 28 F COIL POINTER BRACKET ASSEMBLY 264471 #6 LOCKWASHER # 6-32 HEX NUT I2SJ7 IST ANTENNA SHIELD ASSEMBLY 26A425 .001 MF 400 57X173 #6X4 P -K TYPE Z" SCREW V. ' 13X328 LINE CORD AND PLUG ASSEMBLY LOOP ANTENNA 35 Z ©John 9X 187 SPACER WOOD (CHASSIS) 26A470 5 RECTIFIER F. A -F BOTTOM PLATg 35 L 6 OUTPUT TUBE ASSEMBLY 227 Rider www.americanradiohistory.com PAGE 17-26 GA MBLE 43-8305 43-9751 MODEL MODEL 12SK7 H R.F. GAMBLE-SKOGMO, INC. 12SA7 MIXER EDV I.F.3 2ND DST.65V 65V ,65V G G S 35L6GT 12SF7 G tU0 ,650. Gs HROO 440 .65V. ISV. STANDARD TUBE SOCKET SYMBOLS AND SCREEN VOLTAGES READ un 500 VOLT SCALE D. -DIODE ALL VOLTAGES EXCEPT LICAILRS AND DIAL LAMP. ART. BETWEEN I TERMINAL S AND X" W]INT SIC SCHEMATIC LOA HEATERS AND SOCKI DIAL I PLATE -CONTROL GRID G. -ANODE GRID Go- OSCILLATOR GRID Gs -SCREEN GRID G AMP VOLTAGES 1 -NEATER' NC- PS Su POINTER CLAMP //11xüü.J.J, v65V. NC B QQjO P-. 20V. R -CATHODE P .IOOV. ú, HI -HEATER TAP K H POSITION InVAC H©`o, H 0 P Go LINE VOLTAGE 117 VOLTS A C NO SIGNAL INPUT READINGS TAKEN WITH 1000 DAMPER VOLI MEIER PLATE RECT. OUTPUT DP GANG CONDENSER IN FULLY CLOSED 35Z5GT H GUIDE- 12SJ7 STRING 1ST A.F VINYLITE NO CONNECTION PLATE A SLEEVE-DRIVE SHAFT COVERING DRIVE SHAFT -METAL SHELL D120071 -SUPPRESSOR GRID D19-2250 DRIVE CORD REPLACEMENT 1400 RC INDEX LINE Turn the large drive pulley to the maximum counter -clockwise position. Use a new drive cord and fasten one end to the tension spring. Hook the other end of the tension Spring over the tal) on the drive pulley. Pass the cord through the slot on the drive pulley rim and continue around pulley 1/o turn counterclockwise. Pass cord around stud A and wind two turns clockwise (from front of chassis) around the -tuning shaft. Turns must progress away from chassis. Pass cord around studs It and C, then under drive pulley and wind 11/2 turns counterclockwise around drive pulley. Stretch tension spring and fasten free end of cord to spring. Attach the dial pointer to the cord and position as instructed in paragraph DIAL CALIBRATION. 600 RC INDEX LINE DIAL POINTER INDEX LINE DIAL BACKGROUND ON CHASSIS BOTTOM PLATE... GU -2079A Battery Installation EXTERNAL ANTENNA DA GROUND LEAD Wood panel used to keep batteries in DOOR AC Speaker Power Output Sensitivity Selectivity ©John F. FOR OPERATION DRIVE CORD REPLACEMENT ELECTRICAL SPECIFICATIONS Frequency Range Intermediate Freq. Tuning Antenna OPEN COTTER PIN place. Power Supply DOOR CLOSED EOR RATTERS OPERATION 105 to 125 volts, DC or 50-60 cycle AC, 30 watts. Battery: A-6 volts, 58 ma. B-90 volts, 9 ma. 530 to 1650 kc. 455 kc. Two -gang capacitor. Built-in loop. Provisions also for external antenna and ground. 5 -inch; P.M.; voice coil impedance 3.2 ohms. 80 milliwatts undistorted. 180 milliwatts maximum. 30 microvolts average for 50-milliwatt output. 43 kc broad at 1000 times signal at 1000 kc. Dial pointer After stringing as shown, tune in station of a known frequency and set pointer at proper position. Apply a drop of glue to secure pointer to strina. Rider www.americanradiohistory.com Spring must take up oll slack. firs. +t Turn pulley completely counter clockwise 1141 GAMBLE PAGE CÄ MBLE-SKOGMO, INC. MODEL 125K7 24A419 -FOR PLASTIC CAB/NEr 55 258 ruva,GASSEMBLr R.F. / 26A 420- FOP w000 CABINErar 6/B .001 MF. 2D01'. r.-2rDDET MIXER 's1 7.Sti GiO A T gar- 1215 3 5 1742F38 8An. 6 o "PANS t Y w 2 4a S GREEN TRANS F ólr. 35L6GT Ou pt 12SJ7 12SF7 12SA7 / RA1775 T 0 /AAPSSEM8,YruANNc rt 0.1 MF. 04 t ó ó 3 .006 TO 43-C314 30,1946 DECEMBER LOOP ANTENNA ASSEMBLY, ; 17-27 EXTERNAL ANTENNA do r001MF O 200 M. 0.5 ú S MF. 2.2 MEG W. 200105 MF. 47 e 0.sw. X ò 05 (1/--4/VVV1e220K^ MF. 0 47 MME VOLUME CONTROL X / 500K,s / 34X347 40-370 RAW r/742.79 o 455 I.F. KC /X 1 5.2 )AIRr / 104MF 20ov OF TUNING .01 MF ASSEMBLY NOTE:? CHASSIS GROUND ONLY. ALL POINTS MARKED 2 12SJ7 2TOK.. a-i ? 35Z5GT X EXTERNAL. NOT -"5' RETURN TO THIS 12S1K7 12SA7 12SF7 T8 POINT 351.613T 2 7 ID 27, i 1500, {0 x; ` 4547 PILOT LIGHT 1501' ___.---. ELECTROLYTIC CAPACLIOR 0.1MF ON-OFF T4001' SWITCH 1 17V AC 50 MF 5oTMF 150Y .ç ! 2001' 0..3 GT! n1A Q F 3 T eÌtl ¿ OW '5/X71B NED RECT s SPEAKER 124439 45.r144 Ot IF DC ALIGNMENT PROCEDURE Check dial pointer position, see Dial Calibration paragraph. Volume Control-Maximum All Adjustments. Allow Chassis and Signal Generator to "Heat Up" for several minutes. Dummy Antennas-.1 mf., 50 mint. The equipment column at right in is required PEAK 012- 2152 455 KC for aligning: Signal Generator, which will provide an accurately calibrated signal at the test frequencies as listed. Output Indicating Meter; Non -Metallic Screwdriver. tt FRONT OSC. TRIMMER R.F. TRIMMER SIGNAL GENERATOR Antenna Frequency Setting Connection 455 KC Control Grid 125E7 - I.F. (Prong No. 2) 1400 KC 1 2nd I.F. Trimmers 1st I.F. Trimmers 1600 KC External Antenna Clip on Loop Point "X" 12SK7 R.F. (Prong No. 3) 50 mmf. Index Lint. External Antenna Clip on Chassis 1400 KC 1400KC mmf. Loop 2NgI.F. 1sT I.F. Oscillator Trimmer See Note A 50 2tat.F. TRIMMERS Isr I.F. TRIMMERS U ANT. TRIMMER Illustration) IMO KC .1 mf. 1st Det. w (See Trimmer mf. Point "X" 12SK7 - R.F. (Prong No. 3) 12SA7 1400 KC Point "X" 12SK7 - R.E. (Prong No. 3) Dial Setting (Prong No. 01 Control Grid 455 KC Coupling Capacitor Ground Connection Adjust Trimmers to Maxirdum DR/VE PULLEY R -F /N MAX/MUM CO(.NTE' CLOCKWISE POSITION Trimmer Index Line. Antenna See Note A Trimmer TENSION SPRING DRIVE CORD REPLACEMENT Turn the large drive pulley tu the maximum s'ouater -clockwise se a new shrive gord and fasten une. end to the tenposition. sion spring". Ilook the tither end of lhs- tension spring user the tali. ors the drive pulley. lass the Bord through the slut on the turn counter drive pulley r'int und continue tumuli] pulley clock wise. Pass curd around stud A and wind Iwo turns e'lock"wise (from front of chassis) around the Inning shaft. Turns »lust progress assay front -chassis. lass torsi around studs 1: and C. then under drive pulley and wind I"fs turns counter clock wise 1t mound drive putley. Stretch tension spring atad fasten free end of cord to spring. Attach the dial pointer to the cord and position as instructed In paragraph 1DIAI, OA LIBRATION. POINTER CLAMP 1 1AL ©John F. Rider www.americanradiohistory.com STRING D'AL STRINGI GUIDE A VINYLITE SLEEVE COVERING DRIVE SHAFT DRIVE SHAFT PAGE 17-28 GAMBLE GAMBLE-SKOGMO, INC. MODEL 43-8312 4486 TERMINAL STRIP C. .01 MF 200 V . /7 15,000s1- 1/2 47 C. MMF 500 R . R . 2711.1 /2 W W MF 400 C. .1 C. .025 200 V 47,00CÁ1/2 R. C. MF 100 MMF 500 C. .05 MF 4.7 MEG. 1/2 C. .01 vF 200 V R. 47O,00011 1/2 W . W V C. 470 MME R. 33 C. 200 470, OCO n- R 264419 ANTENNA ASSEMBLY R 220,000£L1 R. 15,000s1.1/2 W R. 39,000n1/2 /2 MF 200 V C. .001 MF 200 V 000s1 l /2 W 1 /2 MF W . 39 OHMS 2 w 51X116 OUTPUT TRANSFORMER 10X39 DRIVE CORD. C. 47 MMF 500 V W .001 . , 44122TEPMINAL STRIP W C. .1 1-20% 44178 TERMINAL_STRIP 45X344 DRY ELECTROLYTIC V R. W 1% W 200 W. R. 34421 TUBE SOCKET R.2.2 MEG 1/2 V 3(X347 VOLUME CONTROL C. .006 MF 200 V V 82,000/1 1/2 C. .001 MF 400 R 180 .[l. 1/2 W R. 200 MF R. 270,00011.1/2 1 W 1,500/1.1.0 .04 C. V SHIELD 11X115 FIBRE 30X148 CORD CLAMP w R . 470,000n1 /2 W 20% 4492 9X187 LOOP SPACER TERMINAL STRIP 26X464 DRIVE SHAFT 34303 TUBE SOCKETS C. .001 C. .2 MF MF 200 200 V V (5) SPECIFICATIONS 6 Tube Superheterodyne, Including Rectifier Tube. Speaker 5 -inch PM Dynamic Intermediate Frequency 455 KC Selectivity 50 KC Broad at 1.000 Times Signal ©John F. Sensitivity (for .05 watt output with external antenna) 15 microvolta average Power Consumption 35 watts (at 117 volts AC) l'uwerOutput..1.5 watt maximum, .9 watt (10/ harmonics) Rider www.americanradiohistory.com GAMBLE GAMBLE-SKOGMO, INC. 26A424 GRILLE CLOTH AND BAFFLE PAGE 17-29 MODEL 43-8312 FOAPD ASSEMBLY 55X258 CABINET 15x227 POINTER 58X647 DIAL 30X514 CLAMP 30X515 CLAMP 46X1/4 SCREWS 10A300 KNOBS 12X468 FELT WASHER #8 7/8"P -K TYPE x SCREWS "Zit 19X127 FLAT WASHER 28X292 SNAP BUTTONS 28X95 TENSION SPRING 12SK7 R -F AMPLIFIER 12SA7 MIXER 20A98 TUNING ASSEMBLY -F COIL 9A1775 lsr #6 LOCKWASHER #6-32 HEX NUT 12SH7 I -F 17A243 TRIMMER :X649 DIAL BACKGROUND 12A439 SPEAKER 2ND DETECTOR & 6-32 28X265 GROUND PLATE -F COIL 9A1776 2ND #6 LOCKWASHER #6-32 HEX NUT B. x H. 1/4" S. M. #6 LOCKWASHER I `11X128 E.T. SHIELD 25X1497 PILOT LIGHT BRACKET 7A198 SOCKET #47 PILOT LIGHT 35L6 OUTPUT 26A425 ANTENNA SHIELD 352_5 SLEEVING #3 VINYLITE I RECTIFIER BULE. 13X328 LINE CORD AND PLUG ASSEMBLY 25X1464 POINIEP PRKT. 9X182 WOOD SPACER 125,7 1sT 600 KC INDEX LINE DIAL BACKGROUND ON CHASSIS BOTTOM PLATE... 012-2079 ©John F. -F 57X173 BOTTOM PLATE #6 x1,'4" P -K TYPE "Z" SCREW DIAL POINTER INDEX UNE 1400 KC INDEX UNE A DIAL CALIBRATION In ordr to align the receiver, the dial pointer must be Positioned eon the dial string ,creed lv with reference tu the dial. Indes lines are provided ou the dial background attached to the chassis hollow plate far luis purpose. To position the dial pointer, adjust the radio tu the 'stop' position al the low freiluency end of the dial. The dial pointer should he dhecily over the dial pointer index line. (Nee illustration.) If nul, move the pointer on the drive curd until i1 Is dire, tly over the lodes line. The 1.40U Kll index lines are for u s. elle n aligning the rote iv,r. Rider www.americanradiohistory.com PAGE 17-30 GAMBLE 43-8351, MODELS GAMBLE-SKOGMO, INC. 43-8352 DECEMBER 18,1946 IF 12SA7 12SK7 CONVERTER EXTERNAL ANTENNA 12SK7 IST. I.F. DET A.V.C. KC POWER ST AUDIO I 7-7 455 35 L6GT OUTPUT 12SQ7 2ND I.F. PEAK T5 44. EXTERNAL GROUND T4 C2 R2 A.V.C. Ce T2 e.21 P SPLAKER VOICE COIL 3.2 010.45 35Z5GT 1C4 RECTIFIER MIN L2 RIS MO e RII MMI 4 0 RIO YNM + CIOnI4 P1 cll ¡ CIO Lr S1 105 TO 125 V. AC -DC LINE CORD SCHEMATIC DIAGRAM LEGEND RESISTORS RI R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 6 watt 1/2 watt 22,000 ohms, 20%. watt 100 ohms, 10%, 1/2 watt 160,000 ohms, 20'/0, 1/2 watt 10,000 ohms, 10%, Mi watt 470,000 ohms, 20'/c, 1 watt 1000 ohms, 10%, 1/a watt 220 ohms, 10%, 1/2 watt 3.3 mégohrns, 20%, 1/2 watt 1200 ohms, 10'/r, 1 watt 100,000 ohms, 20'/, 1/2 watt 1000 ohms, 20%, 1/1 150,000 ohms, 20%, / megohm, vol.cont. & switch 4.7 megohms, 20%. 1/2 watt 22 ohms, 10%, 2 watt 220,000 ohms. 20%, 1/s watt 1 megohm, 20'/,, 1/1 yvatt 150 ohms, 10',G, 1/2 watt 220 ohms, 10'/, 1 watt 33 ohms, 10';:, 1 watt CONDENSERS CI C2 C3 C4 C6 C6 C7 C8 C9 C10 C11 1 Tube Superheterodyne, including rectifier tube Power Consumption Power Output Selectivity Antenna Built-in Intermediate Frequency ©John F. C12 C13 C14 C15 C16 C17 C18 Antenna section of gang .05 x 200 volts, 25% .0001 mica, 20'jr C19 C20 C21 .05 x 200 volts, 25% L1 L2 I.F. filter choke Antenna trimmer Oscillator trimmer Oscillator section of gang .2 x 400 volts, +30%. -107 MISCELLANEOUS x 200 volts, 25'/c .0001, mica, 20'/c .02 x 400 volts, 25% .1 Electrolytic, 20 x 150 volts Electrolytic, 20 x 150 volta Electrolytic, 40 x 150 volts NOTE: C9, C10, and C11 are in one unit. .0001, mica, 20% .0001, mica, 20% .0001, mica, 20% .002 x 600 volta, 25% .1 x 400 volta. +60%, .02 x 400 volts, 25% .02 x 400 volta. 25% Pl Tl T2 T3 T4 -10% Filter choke Pilot light, 6-8 volts, type T-47 Loop antenna. Oscillator coil Input I.F. coil T5 Output I.F. coil .Output transformer T6 4" x 6" oval P.M. speaker SPECIFICATIONS Speaker 35 W. 0.74 w. undistorted, 0.0 w. maximum 51 kc. broad at 1,000 times signal at 1,000 kc. loop, also provision for external antenna and ground 455 kc. Tuning Sensitivity Frequency Range Power Supply Output Transformer 4x6 in. oz. P.M. voice coil imp. 3.2 ohms Two -gang capacitor,.6 pushbutton 16 mv. asg. for 50 mw. output 535 to 1,720 kc. 105-125 v. D.C., 5040 cycle A.C., also made for 25 cycles Rider www.americanradiohistory.com 1 Impedance ratio 3,500:3.2 PAGE 17-31 GAMBLE GAMBLE-SKOGMO, INC. 43-8351, MODELS 43-8352 CHASSIS VIEW DRIVE CORD REPLACEMENT SET POINTER IN PLACE. THEN SECURE WITH GLUE PUSHBUTTON LOCKING SCREW PUSHBUT TON 1t8 CODLER -I o c In 7. .MI + ACM . 35L6GT FINISH II ^ LJ 12SA7 TUNING FT START 0 1 and 2 are for tuning shaft, step 3 for dial pointer. Direction and number of turns must be as illustrated. S. In step I. first turn condenser pulley to extreme clockwise position (viewing it as shown). 4. In step 3. after installing string, tune to known station and set dial pointer at proper position along dial before glueing. 1. Steps ® I.F. OUPUT ®IF® \ I2SK7 ®7 ® EXTERNAL ANTENNA LEAD (TAN) LOOP ANTENNA 2. 3 SZSGT I2SK7 NPUT STEP GROUND LEAD (BLACK) cou BOTTOM VIEW OF CHASSIS TAKEN MEASUREMENTS METER. e- .4 3 5L6GT ` 5( o © 3175 80 RESISTANCE NIGH WITH FROM TO C21 DESIGNATED VOLT- PONT'S 12SA7 C20 ANT. OSC. TRIMMERS UNDER CHASSIS 70 85 35Z5GT I2SK7 I2SK7 12S47 70 80 110 REAR OF CHASSIS 2035 ALIGNMENT PROCEDURE Align for maximum output. Reduce Input as needed to keep output near 0.4 volts. Connect output meter across 3.2 -ohm output load (resistor may be substituted for voice coil). Turn volume control to maximum for all adjustments. No alignment adjustments should be attempted until all other causes of trouble have been checked. It Is Important that during alignment the loop antenna be maintained at the same distance from the chassis as when the chassis Is Installed in the cabinet. Signal Generator Frequency Band Dummy Connection to Radio Antenna 455 kc .1 mf 455 kc .1 mf Pin I.F. 1720 kc .1 mf BROADCAST 1400 kc 'Insert a ©John .1 200 m m f Pin Pln 4 of 12SK7 2nd I.F. 8 8 of 12SA7 of 12SA7 External antenna lead Ground Connection Tuning Capacitor Setting Adjust for Maximum Output (in order shown) - Rotor full open (plates out of mesh) Two trimmers on top of output I.F. transformer O B9 B- Two trimmers on top of Input I.F. transformer Rotor full open (plates out of mesh) (see tube socket view) External ground lead mf capacitor between ground past of signal generator and F. Rotor full open (plates out of mesh) Rider www.americanradiohistory.com B- of set. Set dial 1400 kc at )sclllator trimmer C21 Antenna trimmer C20 (see tube socket view) PAGE 17-32 GAMBLE 43-8351 MODELS GAMBLE-SKOGMO, INC. 43-8352 DIAL POINTER A2G- 10185 DIFFUSER A6D-10017 CINCH BUTTONS A2M-7758 (2) CORD 1209 SPEAKER B-I8A- 10325 2108 PUSHBUTTON ROD TUNING SHAFT "C" WASHERS (2) 117923 131142 TUNING SHAFT WASHERS (3) (ON ABOVE ROD) 117922 CORD SPRINGS (2) SPRING 131210 120377 120424 DRIVE DRUM 1 LOOP ANTENNA 1 11-260 12SA7 RESISTOR 004 PILOT LIGHT BULB TYPE T-47 (INCLUDES RESISTOR) 1,000 12-1 PILOT LIGHT BRACKET 107389 %2 W C-981-13 TUNING CAPACITOR (COMPLETE WITH 6 LEVER TUNNER) B -8A-10186 OUTPUT TRANSFORMER 105106C 35L6 INPUT I. F. 108140-P 12S K7 35Z5 OUTPUT I. F. 108145-G 12SQ7 ©John F. 2109 Rider www.americanradiohistory.com GAMBLE PAGE 17-33 GAMBLE-SKOGMO, INC. 43-8351, MODELS 43-8352 IVORY CABINET DIAL SCALE 128.659.9 B-60-10012 WALNUT CABINET 128.659.36 CINCH BUTTONS (4) CARDBOARD BACK WALNUT 128740 1313SS 128740 IVORY B 2161 TUNING KNOB -128.687- 8 IVORY VOLUME IVORY WALNUT KNOB -128-686-8 PUSHBUTTONS WALNUT -128688.37 IVORY 128-7958-8 I28.795B-37 WALNUT 128-687.37 PUSHBUTTONS IVORY 128-79413 -8 WALNUT 128-7948.37 STATION CALL LETTERS- A -23D-10190 ACETATE TABS- 112-979 LINE CORD ANO 10795 ¡ \..I BUTTON PLUG 1 - ON CINCH BOTTOM OF CABINET RUBBER FEET 4 CHASSIS MOUNTING SCREWS (3? 134123 132264 13141 VOLUME CONTROL AND ON-OFF SWITCH I MEG. 002 .02 MF MF 4.7 1 600 V 400V OSC. COIL MEG 110-146 MEG. 150 400 MF I 119-135 40 MF 20 MF 150 20 MF } V 100 MMF 500 V V 100 MMF 500 V (2) FILTER CHOKE .05 MF 200 105141 V 33niW 22,000 n .02 MF 400 V-.1 22 4-1 IW I. F. FILTER CHOKE I 105140 W 100 MMF 500 V \-.2 Mf 400 10,000 100.000 n .02 MF 400 V 100 MMF 500V 3. 3 MEG. n 1000 n .05 \-2204-1 100 n 150,000 220,000 200V 150,000 1200n 220 n MF MF V V n 470,000 n (DWG.N"2111 NOTE: TUBE SOCKET FOR 12SK7'S 121-171 200 ) (2) TUBE SOCKETS FOR OTHER TUBES. (4) 121-210 ©John F. Rider www.americanradiohistory.com PAGE 17-34 GAMBLE GAMBLE-SKOGMO, INC. IMODEL 43-8470 i SPECIFICATIONS Tube Superheterodyne, including rectifier tube Power Consumption Power Output 35 w. (at 1.5 w. maximum .5 w. (1I'4 50 kc. broad at 1,000 Selectivity A.C.) harmonics) times signal 117 v. 455 kc. dynamic Intermediate Frequency inch P.M. Speaker 5 Tuning Frequency Range 540 to 1,1500 kc. antenna) 15 mv. avg. Sensitivity DIAL CALIBRATION (for output with external .05 w. DRIVE CORD REPLACEMENT Turn the gang condenser to the fully open position. Use a new drive cord and fasten one end to the tension spring. Hook the other end of the tension spring over the tab on the drive pulley. Pass the cord through the slot on the drive pulley rim and continue around pulley % turn counterclockwise. Pass cord around stud A and wind two turns clockwise (from front of chassis) around the tuning shaft. Turns must progress from chassis, directly over the dial pointer index line. (See illustration). Pass cord around studs B and C, thenaway under drive pulley The 600 KC and 1400 KC index lines are for use when and wind 112 turns counterclockwise around drive pulley. Stretch tension spring and fasten free end of cord to aligning the receiver. spring. Attach the dial pointer to the cord and position as instructed in paragraph DIAL CALIBRATION. In order to align the receiver, the dial pointer must be positioned on the dial string correctly with reference to the dial. Index lines are provided on the dial background attached to the chassis bottom plate for this purpose. To position the dial pointer, turn the gang condenser to the fully closed position. The dial pointer should be DIAL POINTER INDEX LINE 600 KC INDEX LINE 1400 KC INDEX LINE POINTER CLAMP DIAL BACKGROUND ON CHASSIS BOTTOM STRING GUIDE DIAL STRING PLATE... C GANG CONDENSER IN FULLY OPEN POSITION. Dsa-207f A a VINYLITE SLEEVE COVERING DRIVE SHAFT. 12SKy MIXER 35L8GT 12SJ7 12SF7 12SA7 R. F. DRIVE SHAFT OUTPUT Isr AUDIO I.F.-2»oDET. TO EXTERNAL / R ANTENNA 7 \ wttm ' / 5 5 \ war( 6 MM ó 1/rlv2.r r MM MM MM N 4 Tr -1 100 WAIF 5 6 0 ss \ ) LOOP AERIAL O 1 X 21A.111-FO0 MOD MANTEL 20 MF o.TuF. CAI/Ary1SM `.1xiXl ti s X PART X co 43r.144 á 47 1AF. X D25 MF. SANOS X T I.F. 455 RC I ND1 MF 200 NOTE! 35Z5GT X CHASSIS GROUND ONLY. NOT EXTERNAL. oXf ALL POINTS MARKED"X" RETURN 12SK7 123A7 1=3J7 12$P7 A 270« 7 7 7 39n 3 7 2 TO THIS POINT 3S1-0i0T 3 0.5 150on 27A ri 7 T 50 MF /10K 2.0 N #41 PILOT LIGHT 0.1 MF. 10Y F. ELLC)IIpfY71C CAANC/rDrr 13rS44 ON-OFF SWITCH 1 ©John sural RE0 RECT. 5r MF SOY DECEMBtH 18,1946 Rider www.americanradiohistory.com RAM X alt-M/aA GAMBLE PAGE 17-3$ GAMBLE-SKOGMO, INC. 43-8470 MODEL 3A303 TUBE SOCKET R. 27_11_1/2 R. 270,000511/2 W 30X148 . C. MF .01 .1 200 MF 400 V .04 W R. 18011.1/2 W 9. 470,00011 20% 1/2 W . R. 2.2 MEG. 1/2 W 4A121 TERMINAL STRIP 100 MMF 200 . C R MF 200 V 33,0001x1/2 W R. 470,000A. C. .025 MF R. \ C. .01 MF 200 V 45X344 ELECTROLYTIC 50 MF - 150 f 20% 39,0004-x.1/2 W 50 MF - 150 20 MF - 25 100,00041 200 V 3,300.12.1/2 W R. V 51X116 OUTPUT TRANSFORMER C. .2 MF 200 V 9A1805 OSC. F. V 39..2 W 20X329 STUD ©John C V fflue44,1 100 MMF t 20% .05 MF .01 R. 1/2 W R 1.2 W 200 V 82,000 1/2 W 4A92 TERMINAL STRIP V 4A122 TERMINAL STRIP R 4.7 MEG. 1/2 W 3A421 TUBE SOCKET WITH SHIELD R. V W . 47 MMF 470 MMF i 20% 4A119 TERMINAL STRIP 47,000m-1/2 C 47 MMF f 10% .006 MF 200 R. C. V 36X347 VOLUME CONTROL AND SWITCH . 1,500a1 MF 200 V LINE CORD AND PLUG ASSEMPLY . C. C. 13X328 R 15,000.c11/2 W 11X115 FIBRE SHIELD LINE CORD CLAM C R. W Rider www.americanradiohistory.com 4A89 TERMINAL STRIP COIL PAGE 17-36 GAMBLE MODEL AMBLE- KOGMO, N 43-8470 618 CABINET 14X360 GRILLE CLOTH 58X606 DIAL 15X227 DIAL POINTER 104585 KNOBS 14A179 GANG CAPACITOR WITH PULLEY 6X21 RUBBER GROMMET 25X1485 IDLER 28X95 SPRING 28X292 SNAP BUTTON (4) BRACKET 10X35 DRIVE CORD 28X516 GROUND SPRING 32-365 ANTENNA SHIELD` 57X176 MTG. PLATE 12SK7 TUBE 26X464 DRIVE SHAFT 19X192 "C" WASHER. 12SA7 TUBE 58X625 DIAL BACKGROUND 174116 TRIMMER 941775 1ST -F TRANSFORMER 25X1484 POINTER BRACKET I 12SF7 TUBE 124439 SPEAKER #47 PILOT LIGHT 264389 LOOP ANTENNA 25X1497 BRACKET 941776 2ND -F TRANSFORMER 74189 PILOT LIGHT SOCKET I C . .001 MF 400 V 57X173 BOTTOM PLATE 28X265 GROUND PLATE 19X62 FLAT WASHER 35Z5GT TUBE 35L6GT TUBE 9X187 SPACER ©John F. Rider www.americanradiohistory.com 12Sá7 TUBE GAMBLE PAGE 17-37 MODEL 43-8470, 43-8471 GAMBLE-SKOGMO, INC. CC Le.1 Cr N 3 3 rr kz -----= C N < W a = 2 Q H Z o a LL N ú i 3 E E á., Ñ - E o N -t W_` r. A-R u; -Yu ZZ p 4 ó 0 Z O K_ - i- V O °Ñ<'ÖÑ< óV oóVY4o o'Z -. '50-' :c>_,Z O O ° O! _ > oo ZV 1"'Y o= E.. O3 e Car E x S'E)c Z + O a, < o E-0 O< E h E-0 0< to o Z I > V Y h U Y h a we U Y c 0 Y á 9 ti o Y . ái - N UZ aN o - VO ZZ 7 o W El'cá á- E ` óE c' c° C« - ..ár= ¢ U P. O Z ó =,.e f- Y Is A o N 72* E 1:2401 H á o t- 1.- ^* É E N v 5 `- éO .:! 0 .! M.- En` EEÉ t«.E óe ÁÉ 12 _ --re W- R ó >< 19 11 11 ñ 4 < - h pp,yJY71 e aoa9 4 Li 3 rKYL/ é '4k0> r 10,101'01-I q ',VOL), WMA WSI 1VWV1 '4* ~e, Ri 2 ti3 `3 ©John \ F. : OCo`roó,y Z.. .C_ o Rider www.americanradiohistory.com =° . .:a_ c .a= ` o' â>v óOCEO>aC aCá.pdmr d4cádâwtv:a'ó mda = FotLOv-v am ,,3ccu C Ng"_. aA e, .o`PN C 0 IOO. L = °W -ºe'.. oCaA' vu -CC omm ^= m . mL.O= rm mróOa - , -.v o _ F3 o ñ .c º ° 7' a >v `o¿cS-.C: ovY.xS oot vF º e...--1,v^ °F i az-..Ca E1m Zmm>a ÿ=^i_ó`.vv 031L'P -2 - cd _môma=º Ud°y O° x'cx..m :1oiM 7g v U7FM1 < O U 01 íx 0 ve7zJ b E° 2r-CCg-aÛgo_0 ,~` a WC. e F 1=c2 a t _°, m W 'v O -.e. 11-1 $'m-_ ..0:f3+7U_ 5Ote' e Z cL E `ó ^3 e GAMBLE PAGE 17-3 GAIVIBLP,-SKOGMO, INC. C. MODEL 43-8471 .01 MF 200 V 4A86 TERMINAL STRIP R. 15,000..n.1/2 C. 47 W MMF 11X115 FIBRE SHIELD 30X148 CLAMP CORD 1/2 W 1,500n1/2 R. R. 4.7 MEG. 1/2 R. C. . W C. .01 R. C. 82,000.n1/2 R. 180n1/2 C. .1 C. .025 C. R. 200 MF .001 V 400 200 MF 147 200 C 470 V R. 33,000t11/2 47,000r_1/2 MF .006 470,000.1/2 R. .05 W VOLUME C. R. C. TUBE 270,000s11/2 MF V W £10% V W SOCKET 200 .1 MMF MF 200 W V 470,00011.1/2 W L20% 4A178 TERMINAL STRIP 45X344 V DRY ELECTROLYTIC ANTENNA R. 2.2 MEG. 1/2 W 44122 TERMINALSTRIP 51X116 OUTPUT MME R. 15,000.1/2 39,000.1/2 C. .001 MF 200 V C. .001 MF 200 V TRANSFORMER W R. R. W 220,000x.1/2 W 470.000SL1/2 W 4492 TERMINAL STRIP 26X464 DRIVE SHAFT 19X192 "C" WASHERS 19X62 FLAT WASHER 9X187 SPACER 10X39 DRIVE 34303 F. V W ASSEMBLY ©John 00 CONTROL W MM" 26A420 R. 2 MF 36X347 R. 39n2W C. 04 W V 400 MF MF 100 34421 C. . 274-L TUBE SOCKETS (5) C. .2 MF Rider www.americanradiohistory.com 200 V C. .001 MF CORD 200 V PAGE 17-40 GAMBLE GAMBLE-SKOGMO, INC. MODEL 43-8471 SPECIFICATIONS Sensitivity (for .05 watt output with external Tube Superheterodyne, including Rectifier Tube. 15 microvolta average antenna) 5 -inch PM Dynamic Speaker 35 watts (at 117 volts AC) 455 KC Power Consumption Intermediate Frequency 50 KC Broad at 1,000 Times Signal Power Output..1.5 watt maximum..9 watt (10% harmonics) Selectivity 6 618 CAB INE 58X647 DIAL 10A585 KNOBS 15X227 POINTER 14X360 GRILLE CLOTH #8 3/4 x TYPE P -K "Z" SCREWS 19X127 FLAT WASHER 28X292 SNAP BUTTONS 28X95 TENSION SPRING -F AMPLIFIER 12SK7 S R 12SA7 MIXER ry. To 20A97 TUNING ASSEMBLY 17A243 TRIMMER #3 VINYLITE 9A1775 lsr -F COIL #6 LOCKWASHER #6-32 HEX NUT SLEEVING I 12SK7 I -F 2No & 58X649 DIAL BACKGROUND 12A439 SPEAKER 6=32 x 1/4" DETECTOR 28X265 GROUND PLATE H. #6 LOCKWASHER E.T. 11X128 SHIELD -F COIL #6 LOCKWASHER #6-32 HEX NUT 9A1776 2No S. M. B. I 25X1497 PILOT LIGHT BRACKET 26A435 ANTENNA SHIELD 7A198 SOCKET #47 PILOT LIGHT BULB 35L6 OUTPUT 25X1484 POINTER BRKT 35Z5 RECTIFIER 13X328 LINE CORD AND PLUG ASSEMBLY 12SJ7 is r A -F 57X173 BOTTOM #6 x "Z". ©John F. Rider www.americanradiohistory.com PLATE TYPE SCREW 1/4" P -K GAMBLE PAGE 17-41 GAMBLE-SKOGMO, INC. Jnuary 22, 1947 r 2ND I MODEL 43-9196 T-2 TRANS F AN a o C -4A / SW -3 a 7 I S O C-9 01100 ó m C-3 C`_- 0 3 - MFD C-5. _JJ T0-1MFD C-14 .02 MFD. E.,O,M R-3 1500 11 T 3 C 7 (C-7 50E5 4 ITRA6 3 129E6 3 4 12416 40 20 MFD MEO 3 C-8 05MFD P VOLT 60'. SP -I SPEAKER CHASSIS 455 SW -2 ALL IL 8F SOCKETS SHOWN FROM PIN END VIEW KC IF ALL SWITCHES SHOWN IN COUNTERCLOCKWISE POSITION SHAFT END VIEW Electrical and Mechanical Specifications Frequency Range intermediate Frequency_ Power Supply Loudspeaker 540-1600 kc. 455 kc. 117 volts AC,- 60 cycle 5x7 elliptical type PM V.C. Impedance SERVICE PARTS UST Description S3 mhol l'art No. C-3 BD210503 Capacitor, Paper, .05 mid., 20v v. SW -3 B-51576-2 C-9, C-12 BD410103 Capacitor, Paper, .01 mfd., 400 v. h A-51787 C-5, C-11 BD410104 Capacitor, Paper, 0,.1 mfd., 400 v. A-54122 C-14 BD410203 Capacitor, Paper, .02 mfd., 400 v. !! R-5 B-54466-2 C-1, C-8 BD410503 Capacitor, Paper, .05 mfd., 400 v. ;I T-2 B-56718-1 C-13 BD610302 Capacitor, Paper, .003 mfd., 600 v, T-1 B-56722-1 C-6 BM74A101 Capacitor, Mica, 100 mmf. it B-57262-6 C-10 BM74A221 Capacitor, Mica, 220 mmf. R-10 B-57841-1 R-2 BR16B680 Resistor, 68 ohm, 1/3 w. B-57842 R-9 BR16C151 Resistor, 150 ohm, 1/2 w. SP -1 C-57843 R-8 BR17B104 Resistor, 100,000 ohm, 1/3 w. B-57848-1 R-1 BR17B223 Resistor. 22,000 ohm, IA w. - B=57857=1 R-7 BR17B224 Resistor, 220,000 ohm, 1/3 w. B-57858-1 R-4 BR17B335 Resistor, 3.3 megohm, 1/3 w. C-4 C-57859-1 R-6 BR17B685 Resistor, 6.8 megohm, 3 w. A-57863 R-3 BR17E152 Resistor, 1500 ohm, 1 w. L-4 & L-5 D-57870 A-2163 Cable, Drive ' C-57872-1 A-6158 Lamp, Pilot, No. 47 Mazda, 6.3 v. B-57873-1 A-6182-1 Socket, Dial Light A-57878 C-7 B-9564-1 Cap., Ele tro., 40-20 mfd., 150 v. C-2 B-57879-1 A-51163 Clip, Spring C-57882-1 B-51427-5 'Grommet (large) B-58069-1 1;-51427-8 Grommet (small) l'art No. Symbol . ©John F. Rider 3.2 ohms at 400 cycles Power Output (Undistorted) Power Output (Maximum) Tuning Drive Ratio For www.americanradiohistory.com 8 1.5 watt watts 7 to 1 Description Switch, Radio -Phono Spring, for Dial Cable Button, Plug Control, Volume, 500,000 ohm Transformer Assembly, 2nd IF Transformer Assembly, 1st IF Cord, AC Phono. Control, Tone & Switch, 500,000 ohm Coil Assembly, Oscillator Speaker, 5x7 PM Shaft, Tuning Drive Pointer, Dial Strip Assembly, Light Diffusing Capacitor, Variable Sheet, Operating and Service Coil Assembly, Loop Knob - Cabinet (1120) Clip, Gang Mounting Capacitor Assembly, Trimmer Crystal and Indicator, Dial Cord, AC Power chassis and cabinet see page 17-16 PAGE 17-42 MIDEL AMBLE_ 43-9196 GAMBLE-SKOGMO, INC. SOCKET VOLTAGES TUBE POSITION 12BE6 Converter 12BA6 I.F. Amplifier 12AT6 2nd 1 2 3 4 5 6 7 -5 0 24 AC 12 AC 88 88 0 0 0 24 AC 35 AC 88 88 0.7 0 0 12 0 0 0 12 DET.-lst AF-AVC Ac 50B5 Power Output 0 5 85 AC 35 AC 115 88 0 35W4 Rectifier 0 0 85 AC 117 AC 112 AC 112 AC 122 NOTE: All DC voltages measured with a 1000 ohm -per -volt meter from ON-OFF switch (-B) to socket contact indicated. All AC voltages are measured from ON-OFF switch (-B) to socket contact indicated. All voltages are positive DC unless otherwise marked. Volume Control full on. No signal input. Line voltage 117 volts AC. --L\ LOO.ANTENNR TRIMER C ILOUTEO M lACR Of CANNETI II CRRONO i1GFUY GARLE 05C TRIMMER dr Q I E 17 I _i RRPO.PNONO \ Croco VOLUME CONTROL `STATION SELECTOR \-ONOlE SRTTON t TONE CONTROL Dial Mechanism Tube Layout ALIGNMENT PROCEDURE 'Lie following equipment is necessary to properly align this chassis: Frequency and Oscillator adjustments A signal generator which will provide an accu- NOTE: Intermediate may be made with the loop disconnected provided a rately calibrated signal at the frequencies listed. resistor of 10,000 to 50.000 ohms is substituted to An output meter. close the 12BE6 grid circuit. The loop alignment must be done with the loop and chassis mounted in A non-metallic screwdriver. operating position in the cabinet. A single turn loosely RMA loop. coupled to loop may be substituted for RMA loop. Dummy antenna .1 mfd. : - - DIAL TRIMMERS TO TUNE REMARKS HF end IF trimmers Tune to max. GENERATOR CONNECTION IF 455 kc. 12BE6 grid 1620 kc. 12BE6 grid RMA loop HF end 1400 kc. Through loop* RMA loop 1400 kc. * AT RADIO DUMMY ANTENNA .1 mfd. CDEF Osc. F. B Ant. trimmer C-2 Loop trimmer accessible through back of cabinet. ©John trimmer Rider www.americanradiohistory.com Set limit of band Tune to max. K January GAMBLE PAGE 1 7-43 BLE-SKOGMO, INC. 43-9201 MODEL 15, 1947 12BE6 12BD6 12AT6 5065 CONVERTER LE AMP 2ND DET AVC OUTPUT 6 1ST AUDIO T3 4.10 C2 100 C3 820 :N 5 4uu 3NAC TB AC T2ä 27.7- 0-- s--22 314C "I11 Cl SPIARER .0 RI vO1C( COIL 22,51-1 22000 C4 2R3 t MAS New R5 I00 T2 yCES T. C6 C5 264 002,, R9 560.000 R7 {81,000 .S .MEO vO1UNE CONTROT B IF PEAK 455 KC NAV RIB 220,000 SNII(M III RADI POSI110N S2 RII 60000 PI(01 L16MS R AC 105 .25 N v0!S 12AT6 S r () C12 OI 12016 3 12006 . TU&IM ANENT«Pm / T C1 .óó -R ] A NOTCS vous vOTTAGES P 5005 Ut 35W4 115A( » RECTIFIER AC 5 D'AC R12 R13 220 27 Cil -A R14 1AR(N 4/110 50CAE1 DESIGNATED UNE VOLTAGE vOL1AGES 1200 C.APACIIOA OT ALl i00D0Ñü RR-vOLI v0.1N( TER REA01NG5 ARE 14,1, 6ETNEEN A VOL TAG( PINS AND Ill SMMN AR( v.LKS N - AC DC SHOWN 1NLE55 0110RNIS( ARE .I1I 1ND1(AI(0 2N1155 IAg(ATED (SIS10R5 AR( .41E611 21NE55 OTHERWISE 1NOI(A1ED C13-Brt C13-CI,TYI 20206 No Part No. Ref. No. Description I Ref. No. Part No. Description 1 DIAL AND TUNING PARTS CAPACITORS Electrolytic, 40x20x20, 150 volts A-8C-10077 C13 -A, C 13-B, C13 -C C15 -A, A -8E-10723 C15 -B C14 C -8D-11251 C -8D-10942 C6 C -8D-10770 C5 C10 C -8D-10785 C -8D-10789 C8 C -8D-10774 C11 C -8D-10760 C12 C -8F3-119 Cl C -8F3-247 C3 C-8F3-118 C9 C2,C4 C -8F3-113 C7 Trimmer condenser, dual, antenna and oscillator .09 mf x 400 volts 10% tubular .2 mf x 400 volts 10% tubular .05 mf x 200 volts 20% tubular .006 mf x 600 volts 20% tubular .002 mf x 600 volts 20% tubular .02 mf x 400 volts 20% tubular .1 mf x 400 volts 10% tubular 330 mmf x 500 volts 10% mica 820 mmf x 500 volts 5% mica 270 mmf x 500 volts 10% mica 100 mmf x 500 volts 10% mica RESISTORS R7 SI R15 R8 R13 R14 R12 R4 R3 R5 R9 R11 R10 R6 R2 Ri Ti T2 T3 T4 T5 ©John A -10A-10720 C-9B2-44 C -9B1-90 C -9B2-54 C -9B2-63 C -9B1-43 C -9B1-82 C-9BI-50 C -9B1-34 C -9B1-95 Volume control (500M ohms) and switch 33 ohms, 1 watt, 10% 220k ohms, 1/2 watt, 10% 220 ohms, 1 watt, 10% 1200 ohms, 1 watt, 10% 27 ohms, 1/2 watt, 10% 47k ohms, 1/2 watt, 10% 100 ohms, 1/2 watt, 10% 3.3 megohms, 1/2 watt, 20% 560k ohms, 1/2 watt, 10% 1/2 watt, 10% megohms, 1/2 watt, 10% 680 ohms, 1/2 watt, 10% 22k ohms, 1/2 watt, 10% COILS AND TRANSFORMERS Tuner unit, permeability tuned, Ant. C-211-10171 and Osc. coils Input I.F. transformer B -13A-10728 Output I.F. transformer B -13B-10729 B -12C-10074-1 Output6speaker transformer C -9B1-52 C -9B1-302 C -9B1-60 C -9B1-78 F. 150 ohms, 15 Rider www.americanradiohistory.com Dial scale Escutcheon for dial Knobs for radio Dial and bracket assembly B-200-10980 A -55A-10093 Pilot light and bracket A -46A-10793 Pilot light bulb, 6-8 volt type MISCELLANEOUS B -18A-11089 4x6 oval P.M. speaker A-15C-10717 Tube socket A -2H-10718 Shield base A-2H-10974 Tube shield B-15B-10076 Mounting base for electrolytic A -20A-10722 Radio -phono switch A-19B-10727 Phono motor socket A -55A-7386-1 Phono input socket Speaker socket A -19B-11044 Line cord lock A -23A-10344 A.C. line cord and plug B -14M-11085 Needle cup A-2E-12192 Antenna plate B -2E-11038 Knob for radio -phono switch A-5B-11239-1 Extension shaft for radio -phono A -3A-12263 switch Spring clamp for shaft A -2M-11074 Indicator plate A -2C-10972 A -6D-10163 C-5 C-10009-48 A -5B-10170-1 Pl T6 S2 PAGE 17-44 GAMBLE MODEL 43-9201 GAMBLE-SKOGMO, INC. ELECTRICAL SPECIFICATIONS DRIVE CORD REPLACEMENT 105-125 volts, 60 cycle AC, Power Supply VIEWED FROM REAR OF 55 watts. Frequency Range Intermediate Freq Antenna DIAL BRACKET 535-1720 kc. 455 kc. Built-in plate; provisions also for external antenna connection. Permeability. 4 x 6 -inch, P.M., voice coil impedance 3.2 ohms. 0.75 watt undistorted. 1.1 watts maximum. 34 microvolts average for 50-milliwatt output. 55 kc broad at 1000 times signal at 1000 kc. Tuning Speaker Power Output Sensitivity Selectivity DIAL BRACKET ASSEMBLY MUST TO REPLACE DIAL STRING. BE REMOVED C-159 OSC. TRIMMER PILOT LIGHT 0 BRACKE A 55 -,0093 RADIO -PHONO SWITCH T 20A-0722 ELECTROLYTIC A PHONOINPUT C-15 A ANT. TRIMMER SOAKET6 - ANT PLATE E PHONO MOTOR Ì6 SOCKET A198-10727 SPEAKER SOCKET 98 TRIMMERS 35W4 12806 12BE6 Ì0a4 jAT Ì50B5 2207-[ ALL MINA TU RE TUBES EXTERNAL ANT LEAD 43-9201 CHASSIS VIEW TRIMMER VIEW ALIGNMENT PROCEDURE Output meter across 3.2 -ohm output load. Align for maximum output. Reduce input as needed to keep output near 0.4 volts. Frequency SIGNAL GENERATOR Dummy Connection to Radio Antenna Volume control at maximum for all adjustments. Connect ground post of signal generator to B- of radio. TUNER SETTING ADJUST FOR MAXIMUM OUTPUT (in order shown) 455 kc .1 mf Grid (pin 7) of 12BE6 Iron cores all the way out Trimmers on output and input I.F. cans 1720 kc .1 mf Grid (pin 7) of 12BE6 Iron cores all the way out Oscillator trimmer C -15B Iron cores N:a} out Antenna trimmer C-15A 1720 kc 200 mmf Antenna lead k7- 200 mmf Antenna lead I till, .I,Ilut.un1nt and the previous all ustment are all the Turn dial to 1400 kc Adjust position of antenna coil (see coil view)* interlocking; therefore repeat the two adjustments alternately for best results John F. Rider www.americanradiohistory.com GAMBLE PAGE 17-45 GAMBLE-SKOGMO, INC. SC- 43-9201 DIAL SCALE ESCUTCnEON C- MODEL 10009'4E B-60-10969 C INDICATOR PLATE p A -2C -I0972 ::2RAoO-PONO KNOB SWITCH A-56.112» TOP VIEW WITH LID OFF-ON SWITCH + TUNING NOBS A-513-10170-1 & VOLUME CONTROL DIAL REMOVED LIGHT-If the dial lamp burns out the set should not be operated until a new lamp has been installed. Failure to heed this caution may result in a burned -out 35W4 rube. Use only a type T-47 lamp for replacement. View of Coil Assembly The antenna coil assembly is movable left to right. When making the adjustment as required in the alignment procedure, move the coil assembly very slowly, either by hand or by pivoting one edge of a screwdriver blade in the bole and engaging the blade in the geai teeth of the coil form. VOL. CONT. &SWITCH A- OA I -8F3-118 270 MME 500V OUTPUT TRANS B- 12 C-100 74-I `, DIAL &BRACKET ASSEMBLY C 10 720 C -8D-10 \\ 05 MFD. 770 200V B-200-10980 C -BD -11251 ----.09MFD 400V RADIO PHONO SWITCH A -20A- 10722 Y 1 I y TUNER UNIT -C-211-10171 CORD LOCK A -23A- 10344 C -8D-10760 x .I MFD -C -8F3-247 820MMF500V _C-9BI-90 220K I/2 W 400V -9B1-82 47K I/2W, C -8D-10789_ C C -8F3 -I 19 -330MMF500V TRIMMER .002 MFD600V -A -8E -I0723 C -9B1-95 \C -8F3- 113 --100MMF500V Ç -9B2-54 60K I/2 W C -8D-10774_ 02 MFD 400V 5 220-IW PHONO SOCKE A -55A -7386-I MOTOR SOCKET -9B2-63 1200-IW C A-198-10727 SPKR A -19B- 11044 C -8D-10774 - 02 MFD 400V TUBE SOCKET \_\ , ; ',, -'C-BD-10785 A-15C-10717-5REQ 2'C \ CSÓ11%2W -9B1-302 ISMEG. V2W --C-9B1-95 006MFD.600V 560K 1i2W sC-9B1-90 220K 1/2W ©John F. Rider www.americanradiohistory.com `C-9BI-50 100 1/2W C-9BI-78 -' 22K V2W `,> C=9B1-43 27 I/2 W t-982-44 33- IW ?AGE 17-46 GAMBLE MODEL 43-9751 January 15, 1947 GAMBLE-SKOGMO, INC. 1A7GT 1 CONVERTER 1A5GT 1H5GT N5GT I. YP. 2+ OUTPUT OCT. 1.44010 le T CS i v C4.LR ;0. ß" ?t c. .. r. C .008 1 400 V .«T,RELY.. CUP .004 S Avow I 3.8 T 011181/ . 2-B 11 3188 45 RUT 'R' MTTERT RANG cIe B ////// 45 MAT '3 YTT[RE RUS e- - RATTTn RUSS AS Ne PROIE MIRIRO SIS[ I 212 VOGT A BARR9T Rue 01.0,8 ROT[S - SOTTAGES nASORNO RR-COTr VOTrIE(i(R If« ¿Ai ORRATxG rAl AG, USING e[R([x TAG DNSIG«AiND ROUAGE uS v A c ASTRE RO RIAOIxOt AR 5x04x,vOTTAGE ARD A S,000PY- GNA5313 LUNE -GARROT Y USED AS TIE INSISTAI [5 EPRD. RPASVI[p RITO Agen CO[iIE[i[R POIxT. VALISES ARE Ref. No. K SATT UNLESS OTRERISN 35Z5GT RECriEiER SROIR Part No. Description Ref. No. Cl 1009 C5, C12 C6 C7 C8, C13 C9 1295 100128 100135 100127 C10 C11 C14 C15 C16 -A, -B -C, -D 100134 100133 10025 10013 119123 .05 mf, 200 volts, 25% Two -gang, including antenna and oscillator trimmers. Range of gang: 14-452 mmf (ant) and 10-198 (osc). mmf, 20%, mica mf, 120 volts, 25% mf, 120 volts, 25% mf, 120 volts, 25% Approx. 100 mmf. Part of I.F. can .006 mf, 120 volts, 25% .1 mf, 120 volts, 25% .002 mf, 600 volts, 25% .05 mf, 400 volts, 25% Electrolytic; 20 mf x 50 volts, 40 mf x 150 volts, 200 mf x 10 volts, 40 mf x 150 volts 100 .05 .25 .01 RESISTORS * C -9B1-27 C -9B1-67 R1 R2 R3 R4 R5 R6, R10 R7, S2 C-9B1-84 C -9B1-302 C -9B1-62 C -9B1-34 101252 C-981-37 R8 R9 R11 R12 R13 R14 ©John C-9B1-31 C-9B1-42 130343 C -9B1-66 130344 F. Part No. PEAK 455 KC Description COILS AND TRANSFORMERS CAPACITORS C2-A,C2-B, B -8A-10246 C3, C4 IF 220,000 ohms, 1/2 watt, 20% .2,700 ohms, 1/2 watt, 10% 68,000 ohms, 1/2 watt, 10% 15 megohms, 1/2 watt, 20% 1,000 ohms, 1/2 watt, 10% 3.3 megohms, 1/2 watt, 20% Volume contol (1 megohm) and on off switch 10 megohms, 1/2 watt, 20% 1 megohm, 1/2 watt, 20% 22 ohms, 1/2 watt, 10% 545 ohms, 14 watts, 5% 2,200 ohms, 1/2 watt, 10% 1,975 ohms, 6 watts, 5% Tl T2 T3 T4, C9 T5 Loop antenna assembly A-i3D-10239 Oscillator coil 108201 Input I.F. transformer. Range of trimmers: 53-97 mmf each. 108200 Output IF. transformer. Range of trimmers: 39-71 mmf each. 105127 Output transformer B-13E-10250 MISCELLANEOUS SI 114240B 120406 120407 121171 125153 120417 B -14M-10088 115396B B -6D-10249 112925 A -2M-7758 B -2M-10383 112922 B-53A-11340 120197 107249 107362 128641 120410 112910-2 128643-1 128645-31 128647-31 131253 13448B Rider www.americanradiohistory.com Speaker, 5 -inch, P.M. "B" -battery cable assembly "A" -battery cable assembly Tube socket Line-battery switch Spring for line -battery switch Line cord and plug Tube shield Dial scale Diffuser Snap -in rivets for diffuser Snap -in rivets for dial scale Dial pointer Drive cord for dial pointer (20") Spring for drive cord Pilot light, 6-8 volts, type T-47 Socket assembly for pilot light Cabinet back Spring for securing line cord plug Escutcheon for dial Escutcheon for grille Knob, tuning Knob, volume Snap -in rivet, for trimmer hole Rubber grommet for trimmer hole GAMBLE PAGE 17-47 MODEL 43-97511 GAMBLE-SKOGMO, INC. 3- BATTERY CABLE /120406 OUTPUT TRANS ; 105127 ELECTROLYTIC 119123 GANG COND SPEAKER 3-8A- 10246 114240B I L NPUT 108201 I.F. U U. ABAT CABLE 12040 7 b5MFD 200V VOL. CONT. R. SWITCH - 10125 130343 545 TUBE ----1,i 35Z5GT "LI NE CORD B -14M -10088 AC -BATTERY SWITH._--- ----- 125153 100127 .OIMFD 120V 1 BC OSC COIL A -13D-10239 C-8G -12199 IOMMF 10012 8 0001 MFD 2 I,45GT IH5GT' - ---- IA7GT 1NSGT OUTPUT 108200 I.F DIAL PLATE DIAL SCALE 115 727 B-60-1 1294 100127 .01 i ; C -9B1-31 MFD 120V MEG I C I/2W i" Ç-9131-62 M 1/2W/ 025 I 67_- /, , W -_-C-981-42 22 OHM I/2W C -9131-27220M 1/2 W NOTE C-9131-84 68M 1/2W 121171 130344 .'1975 OHM 6 MFD 120V TUBE I/2W ./'(OFippAÁP 120V 700 1/2W 100127__ 01 -9B1-66 220Q .0MF600V -- -----_-__ 05MFD120 1295 C-9131- -".; OHM 14W SOCKT5REQ C-981-302--`_15ILOT SOCKET S BRACKET 107 362 15 MEG .1/2W -12 95" .0001 MFD 25MF 120V 100133 ----' IMF 120V i C -9B1-37 I0MEG 1/2W; "C-9B1-34 -- 10013 05MF400V THE C -8G-12199 CON° TAKES PLACE OFA 3RD TRIMMER ON GANG ASSEM. 3.3MEG 1/2W ALIGNMENT PROCEDURE (Refer to Chassis View on Page 2) Align for maximum output. Reduce input to keep output near 0.4 volts. Output meter across 3.2-ohm output load. Volume control at maximum for all adjustments. Frequency SIGNAL GENERATOR Coupling Capacitor Connection to Radio Ground Connection u needed TUNER SETTING ADJUST TRIMMERS TO MAXIMUM OUTPUT (in order shown) 455 kc .1 mf 1A7GT grid cap* Chassis Rotor full open (plates out of mesh) Input and output trimmers on IF cans 1650 kc .1 mf 1A7GT grid cap* Chassis Rotor full open (plates out of mesh) Oscillator trimmer C4 External antenna clip External ground clip 1400 kc Antenna trimmer C3 1400 kct 200 mmf If loop is not connected when making this adjustment, substitute a 1-megohm resistor across the loop leads. For this adjustment chassis should be remounted in cabinet and loop connected. Antenna trimmer can be reached through a hole in the side of the cabinet. t L. - ©John F. Rider www.americanradiohistory.com www.americanradiohistory.com GAROD PAGE GAROD RADIO CORP. MOLED BP24, PP25 b' A z1/2 óóP m t- a A .( ,, eoo >. á Q e v o ,- v Osz h r fu 00¿ o '`' mV J o 17 ` , 4, , k W Li/ b eA re) r-I Hi V000..00i o. .--i S. Z vOE I-11. 2 F N -1 Hip V\ 6-33.- i 0 v IH IH ó - 4944. -17-1,, hó o ©John F. Rider www.americanradiohistory.com J`u v 4.1 V.) 1 PAGE 17-2 !MODELS GAROD GAROD RADIO CORP. PP24, BP25 This receiver will operate either from batteries contained within the case or from the regular Electric mains (AC or DC) on voltages from 105 to 125. A self-contained antenna Is built in and will give good performance from stations not too remote. Where signal strength is poor or where reception from great distances is required, Antenna (A) and Ground (G) leads are provided, (RED -Antenna, BLACK -Ground). These may be reached thru the small door on the rear of the case. An Antenna from 50 to 100 feet long may be used. BATTERIES - The following batteries are required where no electric power is available: 4# Volt "A" - EVEREADY #746, USALITE #683, BURGESS #G-3, RAYOVAC #P -83A or equivalent. (3-29/32" X 1-5/16" X 4-11/16") - 2 Required 45 Volt "B" - EVEREADY #482, USALITE #640, BURGESS #M-30, RAYOVAC #P -5S30 or equivalent. (3e" X 1-3/4" X 5-7/16") -2 Required TO INSTALL BATTERIES - To Install batteries, the back of the cabinet must be removed,by loosening the four screws which hold it. Insert the plugs into the corresponding batteries. The "A" batteries are then slid in over the shelf on each side of the chassis with the plugs down. The "B" batteries are placed below the shelf with the plugs facing each other. A block to hold the "B"'s Is then screwed down. (See sketch.) With the ELEC-BATT switch on the front panel in the BATT position, the receiver is now ready for operation as a portable unit. When prolonged operation in the "ELECTRIC" position is contemplated (as during the winter season), It is advisable to remove the batteries and store them in a cool,dry place. DO NOT leave exhausted batteries in the carrying case as chemical action may expand the batteries and make It difficult to remove them. WAVE BAND: The range covered Is as follows: 182 - 555 Meters (1650 - 540 KC) Station frequencies are listed in Newspapers and Radio periodicals. OPERATION BATTERY After the batteries have been installed in accordance with the instructions given above, set the slide switch on the front of the cabinet to the right. ELECTRIC Open the small door on the rear of the cabinet providing access to the power cord which can be plugged into any outlet (105 to 125 Volts AC or DC.) Slide the switch on the front of the cabinet to the left. (Elec) The receiver may now be operated by turning the LEFT hand knob to the right,(Clockwise). (Right hand knob.) By rotating the The Volume is turned up and the station tuned in. cabinet slowly (when the self-contained loop Is Used) maximum signal with minimum noise may be obtained. The directionál effect is lost when a large antenna is used, but In this case, ample signal is obtained to be heard above the noise level. The volume is adjusted for the desired level. NOTE:- When this set is tuned in with the power socket. When operating line plug in the socket to be operated from the 115-125 Volt DC line and no signal can be switch in the "ELECTRIC" position, reverse the plug in the light on AC, a slight hum may be heard on some stations. Reversing the will alleviate this condition. ELECTRICAL SPECIFICATIONS Super -heterodyne incorporating Automatic Volume Control and Class "A" beam power output CIRCUIT - TUBES 1A7GT, 1N5GT, 1H5GT, 3Q5GT, 35Z5GT. For placement of these tubes, see diagram on the rear of the chassis. - LOUDSPEAKER ©John F. - 5" PERMANENT MAGNET DYNAMIC. Rider www.americanradiohistory.com GAROD PAGE 17-3 GAROD RADIO CORP. 14B6 600V. 005 o 2 6 = 3 boPop w .14B6 o o 25 15011 TMFD. 25V. W. 150 50A5 VV. V. 1-20MFD 1 14B6 5-46 50A5 35Z5 8 I 8 150V. K 35Y4 I W. 5 E34 TONE CONTROL POWER CONSUMPTION: 38 Watts. MODEL 4AP 470K 5045 I2SK7 . Ta 2 2 PHONO MOTOR VOLUME CONTROL 8 Voltage Amplifier Beam Power Amplifier Rectifier 05 MFD - KILOHMS OI 9.200 OUTPUT TRANS 2030.300 5 PM. SPEAKER 03 36.101-I 13011 5 Y4 A5 1486 A.C. 60 I 1 K 20 MFD. %- 8 ALL CAPACITORS 200 V. UNLESS OTHERWISE MARKED 110 120 4 2.7 _L ALL RESISTORS 01 MFD. - O CD(N 470K fo 2.2K 40 K- KILOHMS 1 MFD. 150 V. -='-- ALL RESISTORS 1/4 WATT AND ALL CAPACITORS 200 V. UNLESS OTHERWISE SPECIFIED 110 -120V. T 40 MFD. 150V. 35Y4 35Y4 © 5045 12SK7 2 14B6 80115W I 8 7 2 I 8 1 8 PICK-UP POWER CONSUMPTION: 40 ID 1486 12SK7 4P kO 02 w 5 3aP, MODEL 3 A P 50A 5 .01 MFD. MODELS 9.200 OUTPUT TRANSFORMER ® 30.300 5' PM SPEAKER 03 36.101-I PHONO MOTOR ® O © 14B6 12SK7 50A5 35Z5 Watts. Voltage Amplifier Voltage Amplifier Beam Power Amplifier Rectifier VOLUME CONTROL TONE CONTROL D. P D T 'ON-OFF" SWITCH VJohn F. Rider www.americanradiohistory.com 5-46 PAGE 17-4 GAROD MODELS 4.A-1, 4A-2 GAROD RADIO CORP. 'Ö 0- e 8614' a O N m II U w C)LLI á w > O O w a W1_140 O N f CO 1 I p K wo L__ f m z Ñ D) Oi WY e - M 8(DO®C, ú 1 N N N Y) f H ó WIr 1HII OII'(-+ mJQUY f v.1... a co 2 ..92'' Oa o 2I' CC \ºº L, 8."-n-rM 1--t{.. 1..--t{.. 8-ii J Q m r eo -Ili Ñ ó 1 ó O o > S c° 8 m v g ºO a ó p s d C * a 2 A P m 2 Ó °ú . É a.ó g 6 c5 a. óû 3 ó ó ó m 5 m E Ó Ñ 7 IA ? ,$ . O'ÿ u ô 0 -u- O m C i pp ° º 9 .gó á Ú Ab .2 a0 - ©John F. Rider www.americanradiohistory.com q d p pº á g á á C a m rJ EúE ` 9 ú H E ° E .Ç ° ç w g-2, v q F N ° >` 9i lI GAROD PAGE 17-5 MODELS 4A-1, 4A-2 GAROD RADIO CORP. 0 a) O ó dJ ... y x: °y ó ,b ~i. bty 1 i ú Ú 8 o w o.Á qx >.. CS x ;º 2 . °~ m ati t3 O g. "5A o aa)öóu`. e o ..0O 1j. 3 ::9 y4 v O a de d= c yôº 71 IC ód ó 0 Á ¢. 4) -ci CT u y a) CI d A ç0 0 0 O X 0 A O y -d O $ Ey a q óm m_ 9 xN e ° ç á) ó fl. a. ö 0 Mb a 4 x 4 ° 0 > e°' w m d bO ' O g:: ty a ° 4N ö ° 1 Ñ U 3 óy ó Ó Á < .q a- ÿ G± O 2 N .záti, i. E . A O O b, ' l7 py t3.,NO N .4 ,. ..a O Á, y .O .4Oy O i. p. 723O >4U O ..au FO. o Ú ,í ö .q H. AaUb> d O a. ,X ÿO FP 2 o a) ú b Ú tn a ñ óaO Ú ü ÑH .R 'Ñ:: A .4 t a)Ó A o> . u t3 múyHzme, úi 4 ID d co aw m a) Ñ 'd Ñt7 : x a) ..... ot7 y E ?Úu 3 X o ÿ Oóv .r u >. N N w O 4 úA a.4.d: .á W O O yúy ú A ñ ' 3 A. o ámCe>c.) x 3~ °úÉgot. .x o ú5a) O, .9 >B á á a y oi O o a x'ti °^ . .: ü 1/1 O Á O p á . Ó . .Á m ( Z_ N WN > 0W O J W U I- < ©John F. Rider www.americanradiohistory.com z- PAGE GAROD 17-6 GAROD RADIO CORP. MODEL 5A2-Y U g .Qf J06\ A0`04 GAIN V OSI LO CO -- 0 Ln U9311Lt, c 1 ó 1:1311 SZ000 Ln N UQVLLIP. VW LC) Eh U9311 SZ (D Ite N NOD -10A NO dOLS 1 I LL 4^ I i `U0000SI p O311S7A 3NINO 9311I J A 001, 90. Od11 NO U OSI rxxti-n, ou > Oo C LL.1 CV o nó> ©John F. Rider www.americanradiohistory.com GAROD PAGE 17-7 J MODEL 5D-5 GAROD RADIO CORP. o o o W Z 0J ì (n'N N Úa J JÚ. I- I-W - F- Fa' N InÑ 1 u) S . (-9 ZHW J j F a Y U = vi Ú e d ¢ a Z W I- i'n O > N 0LZ x0000 p 0 N m 3a r.\ J n 4 ú é á i o m2 zr r úw Q rc dN J d 3 7 U -'/vv' -f 3e= p- W eWJ N n -2...c, U W n J n J 4 O V +n O_ iñoa +_ p O I,1 h IA 000 O® IEiI 9314 L'b P11 ö b .? Ó ß.F' Ñ ? O o '. A t: 0 N ]F ö ,Z iN. 0 a o. N á Q vó in N N N i+. - I.^d - N a) ON 040110 O 0 .N ö t E-...4 ..0 W IHi' m o Ñ ,n ,... m www.americanradiohistory.com Ñ ,., up Ú N o 0 o N at m N >., N>a Ó o h p. O ro W -ii 3 o F r. d_ N i' O > O ö ' d% d'x q öU d u) F t > D W O ot.OE. re W CMÚ 3 b- IL O W O Z,n .-, mO N p m All (D Cg N b +] -WW v > OC Rider ö+ ö+ --, .. Q' jowd ' - \ciaÚW O F. ÿ 00 -0 b ö ö .. NNq .. óa ©John N zI*# öÇÿc U 0001 # .y Ñ[ a .ai N w N o ~ Zo >ö ÿ d N gX cr W O q ÿ + U . 7 0-c) tl P-.5- Hi 0iW 1000 v A e27' 202Z -CHI' ln oa o n ir.._ O N o ó o CO óm rN3 á ,N `.,CD--,; a oJ U 0 baQÓ`, pe Z F,. a .- c3 PAGE GAROD 5D-5 MODEL C 4 NE a. Ti ) O 1 > Ó tr,'a, aOO ti a w ö a Ó Ó ú d m d° LL o Ao a o O Tf C3 -, ú ao 4 d+a,oa 4; A x O y A NA t3 U Ú óó O U O 3 A O a O a) M '43- 0 A ,,>` á, ö i.: t3 - _ N .74 Ú O. O Oó O O aU O v öE-- Ú.N O .. C7 U N O O U ái'2 ín j sr .. ¡ O O.. O O q a) C) '" 13 -b; O ö O Ó E- '. - O b..a. a.A a-- 3 O- oG O ,U vi O O O ai U O a) a) O aois-ó , b, Aá U y m ó ú ü a) OaU, Z °Á. WA i á, cod :.; "a U ©John O' ':y° . "U O. t7 O. O ',4 .4 -0 Ó m u ö k u .q U U - « U O .x p Ú O O. O .-] O ts úO Tid O in O --5 F. a O.q CT . ... Y -' ó á. Ó ' a) O. k cD Ox O Cl. d O aA o.a d 'ú DC Oo 4.co rn O TI . .- O 'ú ca ö OO O Ti ñó.á) tU7 uU N O:d :: U ' 2 'O O . p ö -cf A O .o:ó 3áó d Ap bá a d O .a á.adi o O oI. m ro r.a. « U qtt â) a, 0 a ó..[ O O a. Ñw U O vi a O b O'o O 0 0°, G:d .Q O+ a a) a cn U Ç3 ß. U O nvav A uU, ö C o~ a Lo cs No e,óa. ,cñ wó A rp O.a Cí a>.cp O ö 71.-0 C3 a x ÿ 0,..1...- O- O a ö CJ °) y G O a U AaN a a, oE: oE O C7a)> ,Ç3 ó=a. p` U a U a) a) t3 O oONÁU C3 ú_ b 0`. k" w °2 O óQ.0 3w-0 A ö t3 O GL U O p Ú -`"a'k m.' a -- d O Z g Á aô .r ID z0 -15 N O Ó Ç A05.9.0)08 d ö.. CO bax O OE W > ir, pd rs A cñ O a. U O :a -0 d...,o O w0 ó da °'-[ Ú .. xE- a b Ii'J > Ow U -o ñ dó 3ao. 'ö . O cri U] O U o vi óo á,3 «. tr, ú a k in D ')a O, a. ö O O 4. ÿ O v2ó0ó b $o ..-orcn á.áo ;Oö.ójº °ó.°aO` L7 UA>.'O O w O O a O o O a 0 0 0 0 0 O R a) ÇJ O° a, U a C3 a. o 2 o ó o'x O O . db >+O a.A u á,O a ó0 ó OO Növ) a, 0.3 a O .o á á ö Ó ñ t7 U a) bO AO OóaEaiai..Ó a,U e-. 7+X ö >. w O t7_ 22 ri w p C3 C7 O w O 3 o C a. O a AO..'rÇ O d O ü O A O O O O ba a)ß'k oO á.0UU q .: a. O - Opq (1) rná a 12 A O. b a ty Uÿ ó'o> O 'O ö .N O a U 0ç U O d Ó4 Ú 0.. a WOv C'3o°'_ >OoOOok 3 O o 0 O da p °) ö 2 aUj U a O °=aOi O a,ó :..o u; ..q w Z Ú p KC Cf _5C U O O Ç3 O H r7i (--, aÚá ° O Ó O ' ' m R U>. ö O2 b ba. a Od,Aü ' O b, O N d a)ii ÿ bá, ú00d OA O d 2 O °3vàa ö d y' kk o-2 3w tr+ .+ tl a. >. ..-a) Úúw i3 .r U cn = >A YA co- 3o a.) g ° A N ! y da. O175 A í1, 'a,A Ó '1) O.O 4 T) rn b A ó' _ ai O N ó ó ''p O. ÿ aa A d . -ou ÚOd A°á) v áú O2x HÁ3 vú iñó.ö'ÁO UÁ ° ..9. E ,O a0. A o O O r ¡, O' a ö A a) O'3 N_ CUS x"O d «7 O 17 a) wÁ ° A O ñ ¡-. 3 b Ó2.3A Ú O O vO.a) d°a O a) tl °>42..L-1 ' H Ạ3 0 Ñ c) °Oa) xad a .[x .w "°~Od °`á.p,8 -. . ÑO ,° O. w .A ), Ti Q Ó O O t3 . ts Ó .. a) U Q. ó Ñ u°'iO.á.. ,.4 -a U A d aa) p3m aa dÿ .4 uai C7 ,o A Ú A O *ii") O d.., o o .b . Ó[ .OO> 'o.. iTOO«.o a a. OA i. °>o > U a. _d E-. o N'i.a ^i. O O 7a. e°) O O O W á,: °>öuì°x3 rA O d 3 Ó y > °'oisaöi w .C GAROD RADIO CORP. b O.ú öÁ A + . 17-8 O ,._ a. ód o Rider www.americanradiohistory.com cc W O (3 2 ófc-c- á GAROD PAGE 17-9 / S§)\/ )\° ;{\/ ÏE {.saÑæ )ÿ2 =` J{ sssG 0_ee= -`sz Ç % ¡ 3 \` \ 2g8 \3/ 2§`G$ !Io 3Ù/%\ f/\ S {a æ\Ñ(f §J§t\ g%Q@> )§ E.ª§/ o @!q/3 / El / §® /\ ){{s k z7a ¡ra ®\G 5a§ Ç\ \gw «°® a m3 t( Æ 2\§ j a. a; j\f / {§o 0§ E§/ \3 _G) j} ®3 ; - m /7 £R s!a cy)< 2\\ =° °_® o« G 2v/®G /eÇoc/B at/°-a = .e aaa32; a ail Ñ\{{§j 2ÿ ) S«=oea® °-!ea® U-t.º82 t2/;\aEe/ >=æ;oæ ocm » ®w S o = º§ 3=o0c2oe+Eaa 2§=e.º- Æ:.=,_ \22%-°) ~7e-act.ª8°=®®.§Æ-o c o.ç@c,x =\m`,=omz§ }/E.ÇG.} 2: § Z = & B« ! »® § m 3 §- ® o »Ù = a ` 12T"' 2 =/®7sx-..$If.2 \ÿ}GSÇ(GS§@-:z, @/.//sa823Kn3e322375 á e 2 » ! ÿ: @John F. !mt« a. Rider www.americanradiohistory.com ª ª y ª PAGE 17-10 GAROD MODEL 6k GAROD RADIO CORP. á o U OSI Lc) 9311 Lb' aiw io' O 'i1414 '9314 osa aa' O . ö b .: 6i; 9314 a"Z (t) N .Oa. NOOIOA U) NOdNOSV aipa Ic' r U -ai11loco N 93111 I( a311 IocO' b .4a, it; ; pl ' o Ñ l' Cacas f Q IHiI ©John F. a Î r NO Oo b _o oö N E N ,OU ö o A 009 0i11 SOO' 2O -dbE ..o -e a iuoo [ º a U , aIn a C) aG u7 vr áów o>Y ó áoá 1- Z O u,u, F .` Q3 ¢ oáó=N ou o ; m AOOb 0314 Z' 'aN9 a ö + .N. .-] Ñ m 1NVl O ka N 9314 U O c ñm N ® 03111000. 2 Ó 'OA VIGO. l > a .^' ö Ú E. E, 0.: .... Q o óWw u27Jui¢ > ul WóómºR yp J14. UI W máiióiááJd iáa¢áoFÿp F J 09 17`i LL W J 7dd JO J2ooso< -,"727',9,:,`" I, iágY a eeeefflee® Rider www.americanradiohistory.com ..ai .1-4 O ... ö I-, N C V r,NNN >o Iu Z NÚUI ó,iózS;- oá: T:1 O ö °) .. y N Q (1) 0 m x oo m ó >d ä G N O N ö ia. O O Ua .` Uö O Ó ti d O o â aa ú U) < m d 4 ui al - -A Ñ > a . .4 N .w G.A. N a a U ö d 4 GAROD PAGE 17-11 GAROD RADIO CORP. MODEL m x ó o z á) u, oZo E [. O a,î o t O Q) e O =./1 a) p, U OLI nv03w L9' n 3w zz' ain Io O iwnOS a ( 93w zz N Ú F G WOO lOA NOd0110 > IO ' O d 03,4©1 , DIIQ6 ( 3w©I {( : Ó J Oiwloeo ^ UOLI . 009 A 'Oiw U MOL ñ O ñ. s. E E LO' IF- \ v 1.300 a o C7 E N ..c .0311 SO' O O 1IV2 ONv E QOn Ó > v C~ 009 Oiw z (( i\\ i J zz 6 : O IHI,, ---4( A 009 -Oder LOO. ©John F. J2 o H a 3á W;pduN JmOpWQ 2Oóc p, .12-. W 0C 2 úiáW~qé'OV U;ó'¢ N¢U.W Qu _O iWw¢H ;OuÑ C+. ui Ó o TW N U u -11:2J1iY-2 -NN4+f+UtiZ C U C<; Wm f Ñ_ U oN. p 02 Q www.americanradiohistory.com O o eeeeege®® ® Q ó Rider N O óOno 6A-2 1 www.americanradiohistory.com GE PAGE 17-1, 2 /GTRIGAL RATING: GENERAL ELECTRIC CO. OPERATING FREQUENCIES: Standard Band 105-125 v. a -r Voltage 60 cycles Frequency (All Models) Models 42 and 44 available in 50 cycles 185 watts Wattage (Radio only) 210 watts (With phono) ... Short Wave 1 Short Wave 2 Short Wave 3 Frequency Modulation Frequency Modulation AM I -F Frequency CONNECT 2 JUMPER WHEN yfTuNiNsFM I -F Frequency STD 9 SW ANTENNA IS USED ''L'''. LINE CONNED. JUMPER r 2 . 14.8 to 15.5 mc .42 to 49 mc .88 to 108 mc 455 kc 10.7 mc . dq3 - = S BLACK osº SI O51 1 L4 Gra T4 T 540 _52 30 Si Si 18 I. 27 C25 220 .45401.5._ 3 R. F AMPLIFIER C100 68 .0108 GA ÂIMF R46 7 MC 10 220 C14 C9 3 II Oil REAR LOOP SEC. I .OI 1C19 10 C48 sd 22 RED S3p L.L:21S24 O DIAL -o cej L7 RM o -0....08 /C27 2-20 ó COIL 4F 051 SI K ? O IOF2 o ^óFI CI14 1.5 FqI)f si 2 O _ C381 ?^ COIL AVC O'3 0 -PI S1 R7 C41 R26 100 ) V2 6AK5 DIAL 2,7 C42CI I8 1470 -MF - C26 47 S2A o' DIAL RIO 1022 o Si C117 0 5-80 S28 = 245 T. G17 20-55 L17 C20 C116 3 C18 /le S2C C3 . .02MFT LIB C97 o-4'600ti--- F20 aFl LIS 850-Ì520K3 9-180 ,SE S2E 540-1050KC C5 45-380 Ar L20 C6 CORE LII S2F 45-380 e TUFIIÑG% o L21 540-1050KC ß C23 L9 STD g 7`185-245 - M TUNING VANE 3 OSC. COIL º Flç C28 LI2 FM STD BAND OSC. SHUNT TUNING COIL (DIAL) 636 C3 o -45-380 L13 S2G 155151(C- O . FM 1.10 - B ° p OF2 FI 6F SWITCH SECTION C31 20-55 LEFT J4 -0 0000 A NINE SECTION SELF -CANCELLING PUSH BUTTON .SWITCH. SECTION S2G ALTHOUGH NOT WIRED OPERATES THROUGH CANCELLING ACTION. SWITCH SHOWN IN "DIAL' POSITION. POWER CORD 117 VOLTS A -C -L- FM LINE P2 4. -- 22K § S e S9 ° 117V A -C POWER UNIT VOLUmE CONTROL TREBLE TONE CONTROL 22K MAX TREBLE POS TION/ 82K 82K 330K V8 6SC7 PICK- .05 MF 4 REPRESENT THE S1 470K MODEL R37 PHONO MOTOR 84 330K C79 C80 CBI R 15 6 27K 4.7 4.7 MEG MEG R3I 180K MF 1049 S4 BASS TONE 1:01MF S8 MOSWITCH V5 V6 V7 V4 V9 (L\ 17\ V3 VI VZ VIO 4\4¡\44\4 TO 6SC7 FILAMENTS Br 250V. 061e PLUG IN REAR OF POWER UNIT L24 CII2 100 100 13 AMBER DIAL 0.1MF_J L S48 IRNIZE UP 6----SI-SWI o-52-SW2 0-53-SW3 S4A nue 3 44 ONLY 6-47 LAMPS C128 CHOKE TO S5 C30MF LI_ C127 0.1 MF r ---O FI -FMI L23 R72 2D 22MEGNEG .002 MF R29 DESIGNATIONS FOLLOW F2-FM2 S2J OFF Ci8 22 MEG 33K OSCILLATOR 05MF C33 - B -STO 0102 100 R35 C51 EQUIVALENT SWITCHING OF THE BAND SWITCH, POSITION SHOWN IS FOR STANDARD BROADCAST POSITIONS. PART OF PUSH BUT SWITCH AT LOWER j 29 17-320-400 ALL FIVE POLE SWITCHES, PHONO S2H 94 150V. CBLACK .004MF 22 S SEE RIGHT CENTER OF DIAGRAM FOR ACTUAL WIRING OF PHONO SWITCH SECTION 52H V9 69 07 100 R 17 S1 COIL 10 30 C 132 V10 6AL7GT Bp_!_ OSC -T6.8 = F2 8200 6.8MEG C82 1.22 S2H F. 0119 53__ F20 C78 0 °540 100 TDIMF 180 B CT CI29 P18J3 3-30 3- C1004 _2" AMPLI 1 iSl R66 OIMF AUDIO INDICATOR 33 R40 .71.21 V3 6AK5 S2D C123 C94 II .0IMF RED 575 96 C95 I 475- CI I -10 C4 IB 5Y;Am 62 TUNING 850 1320KC 9-180 T.05MF 2200 T47 R74 =_ STD R -F TRANS. R4 47 R28 R61 2.2 MEG. FI F THESE SYMBOLS LOCATE SWITCH k WAFER WHERE SWITCHING TAKES PLACE. NUMBER) IS CLOSEST TO PANEL. LAND! DESIGNATE FRONT AND REAR SURFACES. C39 1.5 FI O OFI 1000"1-600KG T3 93 320400 C37 S 3F F2 52 220 C40 53 =6e0 CI21 F M. AUDIO CUMF 127 MEG o AM R65 1000 ¡LEG. 1 C44 1.5 4.7 MEG S-pO (oL8 pSWRF = Si R6 R62 R64 1000 AIMF R27 22K 84250V. CONVERTER 2 S1 78 R30 470K 47 I 4--" AUDIO 53" 530S1 48 WHITE 53 , 12E 471 R50 C104 } C ó 2 S2 o VANEDò4 - C64 MEG 120K MEG CIIO )FR442200 84150V OIMF t 688KK R47 410K AVG C65 DI MF 21 _ 2200 R43 2200 1 C101 1 RSI 100K BL R58 27 120K 10,7 MC 120K R24 R21 MFI Ñ9 ORANGE 06MF TUNIN ANT TRANS. @John I( C63 22 4 7 AIMF C67 R60 TJ RED- 147 5 S7 100K 350 5 C53 1C 124 Tm R3 LOOP SHUNT C52L C2q PR P B. IO AIMF 15K 84 250V. 3 il 470 I 3 47^ 17, R23 260_/ AIM = 4700 T WHITE -=APRON PR I. 11 820 I.5MEG. S -W 40-80 20 - R2 2F SI L25 TI ó 1.OIMF R55 R56 R63 1000 __C21 T2 D T R20 V7 C66 SQUELCH 455KC L_ CIO7r AIM 2.7 TRANSó VEL = C12 MMF NGE ----e. C57 C109 AIMF T-2 1CK)5 OFOF2 LI \ 6SV7 GREEN r C62 2- C13 470K __1 ANT' 8 AUDIO CATHODE FOLLOWER T7 V6 , 10.7MC 470 ri 20 GAGS T6 BLUE r 0106 II 2 IB v a FM LIMITER AM- DET V5 6SV7 --- Si VI 4 46Oó 9 C4W! AMPLIFIER TS 6V4 #540a 4 v IRON TUNING CORE LOOP ANT. C55 F I 455KC C54 FI o.OB F AMPLI. pSl 0F2 FI?I 27 , 455KC w o44-S F RI LO MEG. 1E CII -f IM CHOKE w C46 a I 1F _LANT.' conventional antenna Broadcast and Short Wave 300 -ohm input for folded dipole FM FM. DISCRIMINATOR 3-30 OS392 O MODELS MUSAPHONIC 41, 42, 43, 44, 45 ANTENNA INPUTS: . . T L2 ANT. COIL ED . Cl2 F.M. - WHEN NO ANTENNA IS USED 1 VANE NO DIPOLE 300 to 1600 kc 9.4 to 9.8 mc 11.5 to 12.0 mc 540 . Figure 8 -Schematic Diagram, Musaphonic Model 41 through 43 J2 -OtTAL BASE SOCKET RECORD CHANGER: GE Model P4, RCD. CH. 17-5 Rider www.americanradiohistory.com -\ / \ GENERAL ELECTRIC CO. 2ami- u r -1000r+ t- ºQQººººJ ` u 'T.17-1' _ J ºººooººföoò - Ú vB01 t/14 V rlr ---ti YA dT tn. ú * O I Ñ F.'* u N N drf rn m m fy ró..t M'*d ró ^VVr VVT -M `> Ocoe* t.r9 gib m V 1H,. rI- jt et -h' ~Z o r t.0 \ r=Q J CO .W ,., Ip +F2. cc HVO eZ *' 1-ig LD Le ir C ^ N m Ç GENERAL ELECTRIC CO. MODELS MUSAPHOïJIC YI Q GE 17-4 MODEL f > Y m> dclsenrticd %X GE PAGE 1:9;"'U *27,-*oe ms O d T1'*d--1.,,,1-1:1,tnHIIMF- Il 4 u* li. II `Yiïj I QS Q= N Y`) . I N l Í' M r` Ìt2 ST 'flY MN TTT TTT i I o n mx .. I OZ > 1,, Oix cN>? ~ yd I QQz #.dn W W tn. C t` pp vl !J odez -J N C inslb yr tM ++ tn..* ow 00 CV COY Ñ ----F- m ce r- V = dm L-itto gó I m 2 $X N N E O r m a m C CC CK V - 00 J +*CN Nt HI1 * ººßºQº ºººººº O ' \Jr^.I ' GG n num./ E ° ºvOǺÓb I E E VyVt bl JK 1 II`V m J LL HI1 J JJ* Óm Rider ©John F. 1 .- 11,17 Q1 ï Qa V - 'A ti .p- TT VT Jy i <---11I' t V ¡* JÑ O -19,72.,'",:l: Rider Ó; p0 JWZ 77 I OV1 W= W gWOW rn N J OZdtn /7Op ! `> 7 IN O QW OVI Q OW N ó2 ....2.1,_:....J.,2' WQ< Qátlo z0 © 01 CO 2 o_W bN ¢ tl uil l V' *3,1 I 9- --R`V HII Z.-- O1J d mK1ípi.o01ÿla,`--+*p0W-tI0í NNOW'J ÑZ K VIL` `µ Ú ¡ U 7t Z1 ' ` 01::_)::1l MÑ ...DI II` to TN IuN 1eÑ Z tOo \\` \\\ 1_nrtf T J N 0 á Ì pv^^JJ V* a¡N Ila0'I. < cc* Ñ * ÚV V V*_ IC N33>M tól. tn IN J m dpp Le- tDÑ or> Ñ X AY N IW * A.f 2 o y tD ó o N Y < i F. oc r gig I 7.414+ ` 1n tn z¢ 00 tn.-9 rooe I mY ©John I Oe V* ¡HI. J> Od 3a0 î éu* 11' 1/40 CO -H~V x -a N F -II m ú l_ r '`H ,c tGi '=z Z73OO V N¡9 -J Q cc, o P. + p W toug z aF ¡I (1t`Zll09lr d e i 1 S o }f 2e""' .:`'o Ñ V t * * uOi2N * m N N cc > 3- to .orti .p -M/r-- r O- "III Qº W 4i ÑÑ21t.Vzsen CC * i J * I' W N Ip V J O áyz 2--1aW O 7 W p J t=0o 3N3 N I Sdtn * QV'i V `WOW HII I ú ---Iryy'y'I¡'' Q1 tY ` +* Hi-In 1V Y JY p . ZKO W Ot/1 hg' WpO W_ F WJtY,JK o~Q*<* ze e GE PAGE 17-2718 GENERAL ELECTRIC CO. OPERATING FREQUENCIES: CABINET: Mahogany ... 35 in. 35 in. . . 17 ! . Voltage Frequency Wattage. a FM DIPOLE 105 o PIT ß 00 1$ / I VANE R -F O -C. 100I AMPLIFIER _Ó1M 2 rC65 C2 VI 6AG5 FI S2 S 34-70 A 2°0 SI T 455 RI L20 ORANGE MEG 4-50 C54 62.OIM 0: 350 ) I 455 470 RIO R2 47f1 7 15K ! < .05MF .--1( 662 = Ó2 R38 T 47 RB 687 R46I 01 IMF R21 68K 10 MEG C291 6211 AM AUDIO AND AVG 47 I FM AUDIO ?RI5 27K Oy 3 III TUNING VANE 4 T5 g. $ R9 100K C3 220 F +245V 1-4 o- 52-SWQ +140V 1 C57 7-280'380 R47 3.3 MEG 4 Sé50 5520KC SSF .02MF C8oj Z VVV C73.1 S50 680 540-1050 KC o-- PH01740 I RADIO = IN (MANUAL) 10 OR PHONO OUT E 05 00250 STD. BAND OSC. SHUNT TUNING COIL PHONO IN C. TUNING VANE o o 14 LB é sm. g.BAND. OSC. COIL FM COIL o bFl +140V I .106 T3-30 o c,016 3-30 rt LI9 g 18 K C4I 47 I PLUG T100 LII SOCKET OR END F VIEW OF PLUG.) (SIDE OF CHASSIS) F R106 68K JACK SC7O C44 51 PICK- 15 475575 4658 - - MOTOR 52 -Schematic Diagram, Model 417A 2 MEG CON. C90 22 R28 82K 22011 R26 2 J FOR 50 CYCLE OPERATION BREA((, CONNECTION AT X RECONNECT AS SHOWN PH DASH LINE DIAL LIGHTS BLACK RI09 33K POWER SWITCH 6105A-15 MF +.(7 11\1PILOT OF NEMT clnP SRI05 FILAMENT WIRING 'N LIGHT AT CA8 RI07 33K BLACK I 200K 1 F 27K CIRCLES ALONG THIS LINE INDICATE PLUG 6 SOCKET CONNECTIONS AS FOLLOWS: (BOTTOM VIEW OF SOCKET OR END VIEW OF PLUG (REAR OF CHASSIS.) O R101 B 0 3.3K 3 3800 SSF. 3oMF R29 - I _ UP PHONO C59 C46Ai C46B_ 30MFT -VOL. AK I T RIO4 LI B_ PHONO SWITCH SECTION 1-/ 68K R108 675 ^56 F SEE CENTER OF DIAGRAM FOR ACTUAL CIRCUIT WIRING OF 8 0363 F01 ( 037 PHONOGRAPH -,- 1470 2Ce2 ISMF PRE-AMPLIFIER jG15MB Cl2 +- 6460 W.. MF ÁÓ70 MF TONE__ SWITCH S3 C104 ,02MF I I 64 L __TREBLE IA V3 6AK5 OO K _ FLEXIBLE SHIELDED WIR IBOK MOTOR SWITCH CIRCLES ALONG THIS LINE INDICATE PLUG B SOCKET CONNECTIONS AS FOLLOWS: PHONO PLUG C8 C45 _,L C33 .0FI D CHASSIS J-667 ^C7210 22 10 R44 33K I JACK AT MAIN r 115011 5K 680 C a F2 IRON TUNING SLUG I J L 475-575 LOCAL OSCILLATOR C76 0 AT LOWER LEFT +245V 55G 540-1050KC 540-1050KC I-10--'----1 PART OF PUSHBUTTON SWITCH 656 R35 R36 BASS TONE SWITCH S2 R40 F2-FM2 pL18 R3 -10K R45 2 A -AUTO SWITCH SECTION L3 55F V I( O_FI-FMI 4170 016 FI 92 B-STD S5A 10001600KC 071-5.6 SYMBOLS NEAR BANDSWITCH SECTIONS LOCATE SWITCH WAFER WHERE THE EQUIVALENT SWITCHING TAKES PLACE. NUMBER ONE IS 0LSEN TO PANEL. FANA R REPRESENT FRONT AND REAR WAFER SURFACES. I EQUIVALENT SWITCHING OF THE BANDSWITCH. POSITION SHOWN IS THE STANDARD BROADCAST POSITION. DESIGNATIONS ARE AS FOLLOWS: óL4 FM A ALL FIVE -POLE SWITCHES SUCH AS THESE REPRESENT THE SI -SW _C70 SI V J IRON ° e QFZ O COIL o +3)0 +140 V +140V 3R SIX -SECTION SELF -CANCELLING -PUSH BUTTON STA SELECTOR SWITCH. FIFTH SECTION SSE ALTHOUGH NOT WIRED,OPERATES THRU CANCELLING ACTION. S5E, SHOWN DEPRESSED. r C84 = 45-380 C43 005 4.7K 627-15 683 45-380 ' MF 4 45-380 390 245V +245 PRI. C8o 9-180 R42 FI A TMF ANT. BEAM -A -SCOPE CONNECTOR. END OF PLUG BOTTOM OF SOCKET 220K 064 R20 4.7K F +245V M 1.5 33 .OIMF D MF re 100 C139 2.2K C66 3-30 - +1C206 270f1 634 47K << 68K R(4 22MEG RI9 33K R24 RI3< 2.2K C53 .02 MF CC 3 R31r R23 (20K R39-82 K R27 C9 R7 56K ^7( 220K IE-- ª 1(.002 MF 6 2 RI6 220K 7 ( V8 6V6GT C51 I R22 120K _ C30-ff¡-0IMF ) KC I' 1649 5 C86 MF 677.L 1. C55 BLACK 79 -r- C61 R12 KC 33K 100 V7 6AQ7GT e T05 R17 6- V6 6SH7 MF .2 S2 o - Variable Reluctance 250 ohms D -C Resistance 6 3 3I Ìoo F2á0 g2 o CI Type watts I Tç I_ 80-130 3 30 652-6.8 B PHONOGRAPH PICK-UP: ?-211 q1GT I . Broadcast and Short Wave-conventional antenna FM -300 -ohm input for folded dipole me I I ! Alnico PM 12 inches ....8 ohms ANTENNA INPUTS: watts - 2 I 1 Ppl -31100I Size Voice Coil Impedance (400 cps) T9 IC94 2-20 6 2-20 d IraG" 0 IRON Fl F2 TUNING SLUG 10 V5 6SV7 ILO A C50 ...10.7 TB TUNING iTC2IS5 MEG. .. ... Type ........ .........88 C26 00 R37 2 4 0 5 5 V4 6507 IS USED DIPOLE 1 . Undistorted Maximum CONNECT JUMPER WHEN LINE . LOUDSPEAKER: 540 to 1600 kc ..9.4 to 9.9 me 11.6 to 12.1 me ..42 to 50 me to 108 me 455 kc .. POWER OUTPUT (117 volts fine): 100-125 60 cycles 105 50 NO DIPOLE CONNECT JUMPER WEN NO ANTENNA IS USED I 100-125 cycles .... º in. Rating A6 Rating A5 ELECTRICAL RATING (INPUT): S.W. ANTENNA Standard Band .... Short Wave 1. Short Wave 2 Frequency Modulation Frequency Modulation AM I -F Frequency.. FM I -F Frequency 417A Wood Model. Material Color Height Width Depth BROADCAST MODEL 417A TMF l ti ° o D L-------6.3V.A-C ti PHONo POWER .PLyU GB,.,SOCKET -'Li L+"'ti\\11C`\.^G`1.11T.1111ti\.1ti\1ti1\1.ti11T.11.1\l\llti1ti1ti1.ti1.1ti1.\ti1\ AC 115V 4-47 D POWER CORD @John F. Rider RECORD CHANGER: GE Model PS, RCD. CrI. 17-1 bed QCiZEIIfGiI(Sl " GE PAGE 17-29 GENERAL ELECTRIC CO. lV Hu o m o OC >Nu/OES cK o CO Kr, V HI' 2 0! 'm Ñ N OK e K Ó K T.,.....11-1I, et N < vN-IP m + v Li- HII --iHI' e. -IH" cr, F T X O w F- HI 2 oe r á + HII IPL cD en _ I zf á0[1p OLL o F- Cr, -1111 GENERAL ELECTRIC CO. 417A ola, YA 2 I MOOEL 4HI r 1 417A PAGE 17-30 GE e WÓ dK m Len o MODEL dchemc..licd 1r NI Ln> H V M- >AO= z 0 N N CO tl IHI' Ñ DÖl + fI11 I` .,7;4` N. ¡- Ñ u a,* N & IHI III V .. á r + r; dlH >to, -e + J v > =L., o I' V In {V NI aU'H >(n_ (V¡) eó zJ zF cr)J 1,,L In O K O r dOH ce , J >v),_ao ,.9:- o CO ,,>a< ú Nev. I.7 I r -i V IV !HP It/ «X NYWI >Qx .. 1,9 F4u .-o.* r" Ce I o .--, 0'C d J Tv III :°-..Rr Ñ ,--o-b--IHI, w N .n Ir I HIcn r & d roa J -I l I, p= I HI ¡M IHI, NYZ ><0 Le,! v ce L ©John r F. `pe 1 Rider J' p " C< Ñ WI I IHI V C WI 0 --IU li .~H .«0 ú' a dNd ce u ",' 16- VI I O en CO JT N HI' -I ^ A.A. + V + OC e o-II II ©John F. Rider -IHI' nlwapecii 1ejteNlaticei rr GE PAGE GENERAL ELECTRIC CO. 41, 42, 43, 44, 45 MODEL º 502 N á T¢J ,,9,,C ¢ H2ÑÓ o WNI O.c.Z < 3030 7-; U Y'o ¢wá IHN ce 201..-1 e, W 11-4N2N= Ó FIOiÑZ I a. m et N m N li 00 d* ac +* ONe `ú' x ..--N OC l N m N r U r ceçc NN m4, * ' u á J C se V4 _ v Ñ ú "IF--iII Nv 00 V NN 4 _ + VI C. V* VV0 L.. tiI r Lee > U c Ú íi, I. N "11-11' I --D Nm I- O,rt, II dn *c.c.s*, 00. ó V > O .í0_n.D X ó Net + u-, +Ì ÌNn X V I- f9iD ogee ro V = uu e-., 00 * a r. + .NV -I IH4 f ú l 14- or> ++ Z.- ¡I_ _y y lf U en u-, CO 7_-, e * - U N Ja ÓL m' N 'I DI W K iI L_ G íNn î N oc v _* V` m C11 u `0c Q D L. off m J rm !K ¢ ++ * HN o U Ned t-r. * OVCOrc H4 u CO 6 ipAAJ I" " N Vi d CO O 2 1 ©John F. Nm V Rider www.americanradiohistory.com e N -en Ñ u ao* r_ 0 ++ * m fro- u + K OS v +* t _Ñ P' IF N -1I-I4 CZ Ce ec X 1u NN ++ * r...3 o o'= THHI. n` -ii ca * -iHN ó_ roe Oe x $ . IU x Ha `IF FH' ro ....1- * Chen ++ 00 f ., N < º r//I,v I ?Ñ x: a VV u119.--h r m p * o0 (D* y N -F IA IHN I" JV* * I -rg+ [N i9 OC Lt JWJC 17-5 MODELS MUSAPHON IC deiseneratics // \\ PAGE GE 17-6 GENERAL ELECTRIC CO. MODELS MUSAPHONIC 41, 42, 43, 44, 45. MODEL 502 ZW N O QZ H < =Jxw Hzl_-0 30 3 0 u dm ;,J till.' H ,-",--- NN ++ N d x ',VD',VD V v.:+N -oómo + eeJ OC 1. CV II' 1 VII N,.9 I.,¡x K uú O I K Op ^ .--4,ÚU z0 * r VV++r + 1.41 r=á -c2 L._ >H In eN Olen .'V VV µ-I íZr II r ll I- .IT 1 4. V en in L. . Na Lc, v Lii-11. O Ians.9 _ +* 24 J IF m i V¡I I*im << --il-- ÑO +x V d r NN Ú ¢ u > &s* .v ++ x ó OC u> 00 -tl-* O NN ++ C. "no-. 00 ó 07 ó * D m V r --"'-'11---0.,n * 0 l101T' la -Ne(..n,0 d * m} IirHo O L01 m m * < * N. u-12-.* =á~± ar= I OC 1-4.-¡> _meo= ZWO 2Gg d 5ú* x VOZ OOZ DCYO IÌ)I ,D 0-.-0d I..Iy O E. NI Nm tn O =3-N cL ,.9 L., 3, m CO _ o Ñ +1 II 1 R V o NN Z.5 -iF--I)I :2+ V 00,O l m d ÑN + + --P IF IHM dr x 0D *it roo ul YW ococ ¢ II, m d 0 u J N o-d-.-,fiP-r IM MÜ re N ''''' ku ene má I X CO Q u Ñ JCC 0 1\1l l I` i111 In J N u 1 4 - J +8. Ql uu OCK VI Zu 11-I1. OO V Um 11.Q c0 tiºo-^ if- f`-- r 11 1 1 1 d * ao I > V nee D ce k Q r VV 4 oo-oT - J á . á¢ Ú }' ll- V kS4AJJl-Ol K aD W N YZI 1 1yl 1 Lan N V Ol V Rider www.americanradiohistory.com Lelo-+ q v LV J o--/T1 --+M/-I l0O* * 0:1NÍ' It N-e-- I F. U d,D mN _rV -J NN Ce++ a0 ©John V IHI' 11 J ,.--...Ql II' Ó D --IIVI Ñ V m h- d Ii p N1- v * W V La_ Il 1.--0 (e 1",-.NM-+ÑÑ + + en- rc cc * Cr. W ZI 1 J schematics \\ GE PAGE MODELS rdüSAPHONIC GENERAL ELECTRIC CO. 41, 42, 43, 44, 46 MODEL s O.. x x b * 0. V ZW N zaYa Zó O 03 3Z wmÓ .1_o C. a IH' O `^2vi IHI Ñ, ,M, II WÓ .j 2 d ~2 Qui IVIÑ3 X CC* M = YOC YO ö ú 1 Ul ó óv N u) Y co JVJQyR,Z wáóo--MI. moom z0 0lá n ., \ ,º CO CO00 :,e VI Hf N M 'O Zn' M en ? G U m To ú m X 5 m 3 t u m 'till X aâX W m 1,' o M 502 . . O. c M D. O .. r c ñe le nn nM nM P .. are :C a .. >. RWa*á 8 .,,.. CO M°° i wZ á 03 o m ÿu m p X ba emº L 26: 5 e1 Ç m L el ¡gig nk: tu mÇ m A < ó ó ó omi eai m X m . 3 öá m m m .0 X aé 3 X X .2 r ó . cz û 3 . m X X >, + + V m IH , o m úw, > e; e Á e L. o s _ (V ó ` T I a ¢ º .I' . .9 ºae ü ¡ººº1 r- * ceceó,9 X * O MJ ó Nln NN ++ *c.-r2 ú IH ó T OV ++ -"II a - in l9 UAA) I- ü ..O.."' OC Oc o K iHi. 3.3 0 O n NN * N V1 9 o * -I N 07 p, m---,M*-p' , Ñ ü * * uV n NN ++ + + 2c0:__ p0 -4 * r 11, -o-" aü 'F II' Ñ Ñ yV Jºº 4_ - W V IN N CO HI, Teo í N O N J -W '1st N J 1 WI N ©John F. Ú Rider www.americanradiohistory.com á x m s i Ó á v á co V 17-7 ñ r m e PAGE 17-8 GE PIODEIS MlJSAPHOìv I O 41, 42, 43, 44, 45 GENERAL ELECTRIC CO. GENERAL INFORMATION Pert No. INTRODUCTION Symbol The information contained in this service note covers the MUSAPHONIC Models 41 thru 45 completely except for the record player. UNIVERSAL REPLACEMENT PARTS The "r -f end" of the receiver is unusual in a number of respects. Variable inductance tuning is employed instead of using a conventional tuning capacitor. This design makes possible two distinct advantages. First, it provides a high efficiency FM circuit in the 88 to 108 megacycle range which would not be possible with the more conventional methods of tuning. Second, it provides stable shortwave spread -bands which tune as easily as the broadcast band. Other advantages are also obtained but the two mentioned above are the most important. Tuning is accomplished by an "elevator" which consists of a rigid plastic horizontal plate raised and lowered by means of a windlass controlled by the tuning knob at the panel. From this plate are suspended three powdered iron cores which tune the broadcast r -f, converter, and oscillator coils; and three tuning "vanes" which tune three low -inductance circuits. These latter circuits are employed in both FM bands and both shortwave bands with the exception of the antenna circuit for the shortwave spread -bands when a broad tuned antenna coil is used and the r -f guillotine tuner is switched out. They are called "guillotine" tuners because of their appearance. FACTS ABOUT "GUILLOTINE" TUNING' The "guillotine" tuners are designed primarily for the 88-108 megacycle FM band where special technique is needed to realize high gain and circuit stability. Ordinary coils, tuned by a variable capacitor are inefficient at these frequencies, first, because of the low inductances required to reach these frequencies when a variable tuning capacitor is employed and, second, because shunt capacity reduces the gain of the amplifier circuit; shunt capacity must be kept yery low. Another disadvantage of standard tuning arrangments at these frequencies is that common coupling is obtained through the shaft of a ganged tuning capacitor unless insulated single sections are used (cumbersome and costly ). Common coupling of this type tends to cause oscillation or general instability and precludes high gain per stage. The guillotines make possible short leads, completely isolated sections, stable tuning, high Q circuits, low shunt capacity, and location of each tuner in the' best physical and electrical position in the assembly. Furthermore, since the shunt capacity is small and the inductance is consequently at its highest corresponding value, the additional unavoidable inductance introduced in the wiring, band switch, etc., produces a minimum of circuit losses and unbalance. The guillotine tuner consists of a heavy, silver-plated, two turn square coil, rigidly supported between two plastic posts. A fiat, solid vane slides up and down between the two turns. It is guided in grooves in the plastic posts so that it passes between the two sections of the coil without touching them. The posts are so moulded and the coil so constructed that the whole assembly is held rigidly at a predetermined spacing. The tuning vane is raised and lowered by the tuning elevator. When the elevator is all the way up (set tuned to lowest frequency), the vane is completely above the coil which then acts as a simple two -turn coil. As the set is tuned toward the higher frequencies, the vane moves downward into the field of the coil until, finally, it is all the way in. The vane reduces the inductance of the coil through two principles. First, it acts as a shorted turn, and thus reduces inductance directly; second, it provides a barrier between the two turns of the coil which reduces the mutual coupling and thus also reduces inductance. The tuners described above are identified as L2, L7, and L9 on the schematic diagram. FM BANDS Guillotine tuners L2, L7, and L9 are used as the tuned circuits for the r -f amplifier, converter, and local oscillator respectively, in both FM bands. In the higher frequency band, the tuner is used with only a small shunt trimmer for adjusting distributed capacity. In the lower band, a higher value shunt trimmer is used to reduce the frequency. The layout of band switch, tuners, and tube sockets is arranged to give the shortest possible leads when the FM bands are in use. Thé lead length in the other bands is not nearly so critical. CAPACITOR --.001 mid., 500 v., paper CAPACITOR -.002 mfd., 600 v., paper CAPACITOR- .01 mid.. 600 v., paper C208 C85, 88 C42, 49, 52, UCC-035 THE TUNING SYSTEM Description UCC-036 UCC-040 53, 58, 63, 65, 71, 74, 75, 87, 90, 91, 94, 103, 104, 105, 107, 108, 109, 119, 124, 125, 126, 207 CAPACITOR - C19, 18, 80, UCC 041 .02 mfd., 600 v., paper UCC-042 83, 123, 209 C79, 81, 82, UCC-045 C48, 50, 51, CAPACITOR .05 mfd., 600 y., paper UCC-048 UCC-056 UCG-2048 UCN-502 UCN-505 UCN-506 UCN-1504 UCN-1530 UCU-012 UCU-020 UCU-028 C76 C203 C22 C20 CAPACITOR CAPACITOR CAPACITOR CAPACITORCAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR CAPACITOR .10 mfd., 600 v., paper .002 mfd., 500 v., paper 680 mmf., mica 84 93, 205, 206 C97 CI, 8 C117 C21 C64, 101 C92 C72, 102, 110, 133 C26, 61, 66, 70, 99, 120, 121, 122 UCU-520 UCU-536 UCU-544 C25 C43, 106, 118 C95, 113, 115 UCU-1504 UCU-1512 UCU-1532 UCW-012 UCW-1004 UCW-1014 UCW-1024 UCW-1028 UDL-005 44, 54 C78 C69 II, UDL-008 CAPACITOR ---.03 mfd., CAPACITOR- 2 1201 - 60Q v., paper 1.5 mmf., ceramic 4.7 mmf., ceramic 6.8 mmf., ceramic 3.3 mmf., ceramic 820 mmf., mica 22 mmf., mica 47 mmf., mica 100 mmf., mica -47 mmf., mica CAPACITOR -220 mmf., mica CAPACITOR ---470 mmf., mica CAPACITOR C96 C30, 130 C24 C36, 116 Cll, j -10 mmf., mica CAPACITOR -22 mmf., mica CAPACITOR -150 mmf., mica CAPACITOR -22 mmf., ceramic CAPACITOR -10 mmf., ceramic CAPACITOR -27 mmf., ceramic CAPACITOR -68 mmf., ceramic CAPACITOR -100 mmf., ceramic PILOT LITE PILOT LITE --Bayonet base ANTENNA TERMINAL BOARD SPEAKER--10-inch PM speaker RESISTOR --33 ohms, 4í w., carbon RESISTOR -100 ohms, 34 w., carbon UJB-027 UOP-101 l URD-013 URD-025 R34 R207, 208, URD-033 URD-041 URD-049 RESISTOR -220 ohms, i4 w., carbon R20 RESISTOR -470 ohms, tí w., carbon R63, 64, 65, RESISTOR -1000 ohms, is w., carbon 211, 212 RIO, 46 71, 204, 206, 209, 210 URD-055 URD-057 R222 R21, 28, 43, 44 URD-059 URD-065 URD-071 R58, 217 R53, 55 R49, 52, 67, 217, 31 URD-077 URD-079 URD-081 R56 R221 R9, 27, 36, 39 URD-083 URD-085 R15 R19, 21S, 219 URD-089 URD-093 URD-095 URD-097 R216, 41 R25 R13, 17 R3, 7, 23, 24' 42, 59 R32, 33, 60 R31 R203, 205 R37, 38. R8, 14, 30, 47, 66 URD-099 URD-103 URD-105 URD-I09 URD-I27 RI, URD-121 12, 54, 57, 51, 218, 220 URD-125 URD-129 R2, 6, 62 R22, 61, 68, 69, URD-133 URD-137 URD-141 URE -067 URE -073 URE -089 URF-079 70, 72, 73 R74, 80 R16, 18 ' R40 R214 R50, 4 R26 R29, 35 ©John F. Rider www.americanradiohistory.com RESISTOR --1800 ohms, 4 w., carbon RESISTOR - 2200 ohms, !4 w., carbon RESISTOR --2700 ohms, 14 w., carbon RESISTOR --4700 ohms, 4 w., carbon RESISTOR --8200 ohms, ,Z w., carbon RESISTOR -15,000 ohms, RESISTOR --18,000 ohms, RESISTOR --22,000 ohms, (4 w., carbon RESISTOR -27,000 ohms, RESISTOR --33,000 ohms, 4 4 344 34 w., carbon w., carbon w., carbon w., carbon RESISTOR -47,000 ohms, Ss w., carbon RESISTOR --68,000 ohms, 4 w., carbon RESISTOR --82,000 ohms, i5 w., carbon RESISTOR - 100,000 ohms, 14 w., carbon RESISTOR -120,000 ohms, !4 w., carbon RESISTOR --180,000 ohms, (4 w., carbon RESISTOR --220,000 ohms, '4 w., carbon RESISTOR -330,000 ohms, 4 w., carbon RESISTOR ---470 ohms, 4 w.. carbon RESISTOR --1.0 meg., w., carbon 14 RESISTOR -1.5 meg., ! S w., carbon RESISTOR --2.2 meg.. (4 w., carbon 71, RESISTOR -3.3 meg., jg w., carbon RESISTOR --4.7 meg., 4 w., carbon RESISTOR- 6.8 meg., y¢ w., carbon RESISTOR -5600 ohms, w., carbon RESISTOR- 10,000 ohms, 1 w., carbon RESISTOR -47,000 ohms, w., carbon RESISTOR-- 18,000 ohms, 2 w., carbon 1 1 GE PAGE 17-9 GENERAL ELECTRIC CO. SHORTWAVE SPREAD -BANDS Band spread tuning in the shortwave bauds is obtained in the converter and oscillator circuits by inserting the guillotine tuners in series with a higher inductance so that the two inductances together form the "L" part of the shortwave tuned circuit. The small percentage change in inductance obtained in the tuner provides smooth, wide, and stable tuning. The "C" part of the tuned circuit consists primarily of a shunt trimmer. Switching from one shortwave band to the other is accomplished by selecting a different shunt trimmer. The converter grid circuit, as an example, includes L8 and L7 in series in the SW1, SW2 and SW3 bands. Tuner L7 is in the ground end of the circuit and the signal is fed into the grid end through C26. The shunt tuning capacity is C37, C39, or C40, depending upon which of the three shortwave bands is used. Additional oscillator coupling capacitors C95, C96 and C97 are also added to compensate for the lower coupling through C20 when the higher shunt capacitors are in the circuit. In the r -f stage, a section of the loop is used as the grid circuit..It is tuned for resonance by a shunt capacitor (C9, C14, or C15) and a shunt inductance (L25). Because a tuned circuit of this type is inherently broad, tuning through the relatively narrow spread -band offers little advantage and is not done. STANDARD BROADCAST BAND When manual tuning is employed (band switch in STD position ), the receiver employs an r -f stage, a converter, and an oscillator, an of which are tuned by iron slugs suspended from the tuning elevator. When push buttons are used, the r -f stage is not used. Instead, a separate antenna coil is used which couples the antenna and loop directly into the converter. A separate coil is used in order to make the toning circuit independent of the dial tuning mechanism so that it may be tuned by trimmers'in the push-button assembly. Switching from manual to push-button tuning is accomplished in the oscillator by using an oscillator coil which is tuned by a separate shunt inductance. In manual tuning, the inductance is one which is tuned by the tuning elevator. In push-button tuning, a fixed shunt capacity C22 plus one of a series of push-button selected coils tunes the oscillator. 1-F AMPLIFIER The i -f amplifier consists of a composite 455 kc and 10.7 me circuit. The electrical changes required to transfer be- tween AM and FM service are made by the band switch. When the switch is in either the FMI or FM2 position, the amplifier operates at 10.7 megacycles and delivers the i -f signal into an FM discriminator circuit. When the switch is in any of the other positions, the amplifier operates at 455 kc. Screen voltage is removed from the tube which acted as an FM limiter and this tube then acts as an AM diode detector. MODELS MUSAPHOîIIC 41, 42, 43, 44, 45 Thus, the AM audio signal appears across R24 while the FM audio signal appears across R32. A section of the band switch switches the audio input circuit from one to the other. The AVC bus is also shorted out for FM. REPLACEMENT OF DRIVE CORDS Dial Stringing Push the tuning elevator all the way down and string the dial as shown in Figure 1. This illustratio'i shows the stringing as viewed from behind the dial scale, as you would see it when working on it. The numbers and arrows indicate the progression of the dial cord from start to finish. Notice that the dial cord, in progressive steps 9, 10, 11, and 12, is made to travel behind the start and end of cord stringing, as viewed in Figure 1. The procedure will be easier if pulley C is by-passed until the rest of the work is finished after which the cord can be pulled tight over that pulley. During the procedure, locate the two brass eyelets so that they fall between pulleys A and B. When finished, crimp the eyelets on the cord in the proper positions to act as minimum and maximum stops for the tuning mechanism. Insert pins through the cord and glue to prevent eyelets from moving. Clip the pointer on the cable halfway between the eyelets. Separate detail drawings are given to show the three different methods of attaching the ends of the cord. The arrangement with the standard helical spring was used in some earlier production receivers. If the cord and spring are to be replaced, the Type 1 spring should be used. It fits the same drum and is an improved type. The Type 2 spring should be used with the later type of drum (with two tabs). When stringing the mechanism with either the Type 1 or Type 2 spring, load the spring by pulling the hook over the projection at the other end of the spring, string the dial and, as a final step, release the hook so that it pulls up the slack in the dial cord. Elevator Stringing The step-by-step procedure for stringing the elevator windlass is shown in Figure 2, a rear view of the mechanism. Start by inserting the metallic cord in slot as shown in Step 1. Observe that the cord is measured five inches from end of loop to where it enters the slot. Now bring the loop end around the pulley counterclockwise, as in Step 2. Next, thread loop through hole in elevator top plate, fastening it to the hoist cord tension spring, as viewed in Step 3. Steps 4, 5, 6, and 7 show how the free end of cord progresses on the pulley, going clockwise and that each turn is laid progressively one in back of the other and in back of the vertical section, going to the tension spring in tuner plate. In Step 6, pass the free end of cord down through the hole in chassis, grasping its end with long -nosed pliers and drawing tension on cord while running elevator completely down to the bottom. Keeping tension on cord and forcing large dial drive drum so that hoist cord 2 1 3 Figure 1-Dial Stringing Diagram Showing Spring Details Figure 2 ©John F. at Right -Elevator Windlass Stringing Procedure Rider www.americanradiohistory.com PAGE 17-10 GE GENERAL ELECTRIC CO. MUSAPHOìdIC MODELS 41, 42, 43, 44, 45 errors in final setting are not serious since leeway is provided in the location of the dial pointer itself. 3 4c> 6 5c) Figure 3-Identification of Switch Lugs -Set Inverted and Viewed from Panel spring is compressed, complete Step 7 making a one turn loop of the cord's free end around the lug shown on end of elevator shaft, and solder. Concluding Comments After replacing the dial cord or the elevator cord, it may be found that some correction in relative positioning is needed. This can be done by loosening the setscrews in the large drive pulley directly behind the dial scale and repositioning it on the shaft. The object, of course, is to permit the tuning control to drive the elevator through its full tuning range. Slight _LOCATED ON MCA CHA6616 C9 0=4-s NC IS T6 5 l 3901r y1061 NIG 410 D DISC ï 10 TIC 0.3r. HEATH (I) CHA55151 EIS N Isrlr 052 0 0y 5 -46 O0 c 9 G46 43 To. .o 023 033 034 031 561c uwc 15E1c 420. NR5 CIT D.c '39 MG STD svo 41.14 , / 56,4 3 KiptO saYc 3T :M CAO O. c 1 1c C4] s1c 66YC 0 C14 Co u 4433 RAND u TRERLE CONTROL and 1-F Stage Gains (2) Aueio Gain o .065 volts at 400 cps to V7 grid with volume control set at maximum will give approximately ,-watt output across the speaker voice coil. 0.35 volts at 400 cps at input of power amplifier chassis (V201, pin 4) will give approximately %-watt output across the speaker voice coil. Figure 9-Location of Tubes and Adjusters STAGE GAIN AND VOLTAGE CHECKS Stage gain measurements by vacuum tube voltmeter or similar measuring devices may be used to check circuit performance and isolate trouble. The gain values listed have a tolerance of 20%. AM IF measurements should be taken with low signal so that AVC is not effective. R -f measurements should be made by measuring the d -c voltage developed at the r -f tube grid (VI) or converter tube grid (V2) by rectification of the signal. F. R -F Signal applied through IRE dummy antenna: Antenna post to V1 grid 3 ® 1000 kc Antenna post to VI grid 2.5 @ 9.6 me 2.0 @ 11.8 me Antenna post to VI grid Antenna post to VI grid 2.0 @ 15.2 me Signal applied through 300 ohms, including signal generator impedance. Dipole terminals to V1 grid 1 5 @ 45 me Dipole terminals to VI grid 1 5 @ 98 me These checks made with oscillator tube (V3) removed: VI grid to V2 grid 10 @ 1000 kc VI grid to V2 grid 6 @ 9.6 me VI grid to V2 grid 7 @ 11.8 me V1 grid to V2 grid 12 @ 15.2 me VI grtid to V2 grid 7 @ 45 me VI grid to V2 grid 6 @ 98 me These checks with oscillator tube (V3) removed: V2 grid to V4 grid 24 @ 455 kc V2 grid to V4 grid 42 @ 10.7 me V4 grid to VS grid 17 @ 455 kc V4 grid to V5 grid 56 @ 10.7 me V5 grid to V6 grid 50 @ 455 kc V5 grid to V6 grid 20 @ 10.7 me 0961. U.1. BOND STC_n PO SITWIIONS ©John WIRING OF BAND SWITCH In order to facilitate repair, replacement, and circuit tracing, a table and diagrams are supplied with reference to the connections made in the band switch. If used properly, these will be of invaluable aid. The remarks which follow are intended to clarify the make-up of the tables and diagramsread them carefully before using the table. The table is broken down into seven parts, one for each switch wafer. Section 1 is nearest the front and Section 7 is the rearmost wafer. Indisidual lugs on each wafer are numbered from 1 to 12, depending upon their position on the wafer. The method of numbering is illustrated in Figure 3. In determining the number, turn the chassis upside down and look from the front toward the rear of the chassis. Thus, lugs 1 and 12 are the ones which are at the bottom when the set is in its normal position; lugs 3 and 4 are on the side with the broadcast band coils; and lugs 9 and 10 are on the side with the 6AK5 tubes. The numbering refers to lugs whether they be on the front or rear of the wafer. Figure 6 shows the physical location of various components and terminals to which reference is made in the table. In those cases where a component symbol number is given in column two, instead of a wire, that component is connected by its own lead wire directly to the switch lug and the connection of the other end of the component is given in the last cottmn. (3) Oscillator Grid Bias D -c voltage developed 12 v. @ 1000 kc 2.8 v. @ 9.6 mc 4.7 v. @ 11.8 mc (4) Socket Pin Voltages Figures 10 and 11 shgw across R9 (average): 6 5 v. @ 15.2 me 46 v. @45mc 35 v. @98mc typical tube pin voltages. All readings should be made from the pins to ground unless otherwise indicated. Rider www.americanradiohistory.com GE PAGE 17-11 GENERAL ELECTRIC CO. MODELS MUSAPHONIC 41, 42, 43, 44, 45 WIRING OF BAND SWITCH (Wire length given from end to end before stripping) SECTION At this -connect lug- - -the lhir other end of which is connected to this Insulated green wire, 133/4" 1 SECTION 4 1 1g. Antenna terminal at rear of chassis 2-3 At this -connect lug- this---the Copper strop with tubing, long 1 3" Copper strap with tubing, 21/2' 2 - --the other end of which to this Trimmer C38, lug nearer is 1.7 Coil LI, terminal 2 long 3 4 Switch section 2, lug Capacitor CS 11 Insulated brown wine, Ig. Dial switch S2A, terminal O 4 Insulated green wire, 21/2" Ig. Trimmer C39, lug nearer T3 S Insulated green wire, 2" long 6 Short copper strap 7 Short copper shop g Capacitor, C41 9 Ws with spaghetti, 5 6 a. W47 b. (Front lug) capacitor C30 (Rear lug) short copper strap Chassis Trimmer C12; lug nearer T2 CIl Tube socket VI, pin 2 Not dipole terminalatreor of chassis One side of 300-ohm transmission line e a. 9 Short bus with spaghetti, 13/4" tong b. 10 a. 11 b. c. Chassis Section Insulated white wire, 51/2" long Dial switch Insulated green wire, 33/4" Ig. Insulated orange wire. 6' Ig. Insulated green wire, 123/4" lg. Antenna transformer T2, terminal 2 Push-button transformer TI, terminal Loop socket J3, at rear of chases, terminal 1, S2 -A a. b. 11 terminal N Tuner L7, rear terminal Tube socket V2, pin 2' 2 Insulated green wire, 31/4" lg. Capacitor, CI Trimmer CIO, lug nearer T2 Section 2, lug 12 3 Insulated green wire, 21/2" Ig. Trimmer C15, lug nearer T2 4 2" long Trimmer C14, lug nearer T2 a. 2 b. Insulated green wire, S 6 Short copper strop Trimmer C13, lug nearer tube VI 7 Short copper strap Tuner L2, terminal nearer rear of S Capacitor C16 Tube socket chassis VI, pin 1 9 12 a. Insulated green wire, 254 Ig. broadcast oscillator coil L16, terminal b. Insulated blue wire, 6h" Insulated green wire, 21" Ig. Dial switch S2A, terminal Ig. Trimmer C33, lug nearer L11 long Insulated green wire, 2" Ig. Trimmer C34, lug nearer L11 Capacitor, C97 Copper strap with tubing, 2" Ig. Trimmer C37, lug nearer T3 Trimmer C31, lug nearer L16 a. b. See lug 1(a) above Capacitor, C116 Copper strap with tubing, 33/4" tong Trimmer C36, lug nearer tuner 17 Air trimmer C32, right-hand fer missal" 7 Short copper strap Tuner L9, left-hand terminal* e Resistor 134 Capaciter, Cis a. b. Short copper strap Section 6, lug Copper strap with tubing, 31/2" SW a. b. Capacitor C77 Copper strap with tubing, 3"lg. Chassis ground c. Insulated brown wire,6" lg. Dial switch 52-A, terminal 0 Loop b. Insulated yellow wire, 123/4" long Sae section 1, lug 4 a. b. Insulated blue wire, 61/2" Ig. See lug 2, oboes Dial switch 52-A, terminal M o. socket 13 terminal at rear 10 of chassis, long 11 LOOP SOCKET c. d. Capacitor, C18 Insulated red wire, Insulated red wire, Insulated green 3 3" long se" long win 21/2" long J3 Ground on bond switch shield RF transformer T3, terminal Terminal strip 1, terminal 2 1 RF transformer T3, terminal 2 4-s s 6 Shpt bus with spaghetti, 13/4' 7 Insulated yellow a. b. c. 9 Terminal strip 2, terminal 4 long a. b. 10 win, 16" Ig. PILOT HOLE Resistor R44 on terminal board on chassis rear apron Resister R1O Capacitor, C119 Insulated blue win, g'/4" Ig. Tube socket V3, pia s Ground lug on bend switch shield Push-button switch S2H,terminal A lug 2 (a), oboe. Capacitor C26 Section 4, lug I1 Resister, R26 Ground lug on terminal strip 2 See TERMINAL STRIP NO2 11-12 Figure 6 -Physical Location of Components Listed in Band Switch Wiring Table TERMINAL STRIP NOI SW ITC WAFER ©John F. oscillator coil LIO, terminal TERMINAL STRIP NO3 20 03 Switch section 3, lug 9 Choke, L6 SW 12 1 a. b. 11 oscillator coil 110, terminal 2 3 I0 8 T a. b. SECTION 3 2 Section S, lug 6 Section 6, lug 1 9 10 411 ' 2' bus with spaghetti, Capacitor C36 4 s 1 a. b. 3 6 Coil Le, terminal 1 SECTION 3 1 Ground on band switch shield Terminal strip 2, terminal 12 SECTION 2 Choke, L23 21" Ig. lug 9 Copper shop with tubing, 31/2 long 1 1 1 Ground lug on terminal strip 2 long See section 3, Sae lug 9 oboes 12 Trimmer C40, lug nearer T3 'Trimmer C37, lug nearer L7 Insulated white wire, 10 terminal 12 Short bus with spaghetti 7" 3 Rider www.americanradiohistory.com 1 PAGE 17-12 GE GENERAL ELECTRIC CO. MODELS MUSAPHONIC 41, 42, 43, 44, 45 WIRING OF BAND SWITCH (Cont'd) SECTION 6 At this lug a. See section 1 -the other end -connect this- -- 5, lug this-lug- At this of which is connected to c. this - -4he other end of which Is connected to this- 1 1 Tuner L9, right-hand terminal* Capacitor C78 Copper strap with tubing, 6" Ig. Air trimmer C32, left-hand terminal* b. -connect SECTION 7 transformer T4, terminal Shielded green wire,12t1" Ig. Discriminator audio output et R30 Insulated blue win of tuning eye cable Tuning eye tube socket V10, pin 4 6 Insulated blue win, 4" 1g. Terminal strip 3, terminal 3 7 Bus wire with spaghetti, 2 3 2 Insulated black win, 51/4" Ig. 1st 3 Insulated green win, 2t1" lg. Broadcast oscillator coil L16, terminal IF E 4 3 5 4 5 7 Short capper strap Air trimmer C24, right-hand terminal* Copper strap, 2" long Tube socked V3, pin 7 Insulated green win, 31" 9 1g. 10 Insulated yellow wire, 41/4 "19. 11 See section 5, lug 10(a) 1st IF transformer 2" lg. Trimmer C31, terminal nearer C32 s 9 T4, terminal 5 1st IF transformer T4, terminal 3 10 Shielded green wire, 83/4" Ig. hono switch 11 Insulated green wire ,101/2'18. Resistor 154 on main chassis 12 Shielded green wire, 111/4' Ig. AM audio output el R25 S2H, terminal E * Looking from front, chassis inverted. **Double lug (front and rear) soldered together. 12 ALIGNMENT 4. EQUIPMENT REQUIRED: Step Signal Generator Frequency Signal Input Point Band Switch Dial Setting Insulated hex wrench, %-inch. 5. .01 mfd. paper capacitor. 6. 400 -ohm, % watt resistor. 7. 200 mmf. mica capacitor. Test oscillator with tone modulation. (See Table.) D -c voltmeter or microammeter. (See Notes 2 and 3.) 3. A -c voltmeter, 1.41 volts. (See Note 6.) 1. 2. See Adjust Note Remarks AM 'IF ALIGNMENT 1 2 3 455 kc Cony. grid directly STD Peak C60 455 kc Cony. grid directly STD Peak C56 Cony. grid directly 455 kc & C59 6 & C55 Peak C45 STD 4, 5, 4, 5, 6 & C46 4, 5, 6 FM IF ALIGNMENT 4 2nd 6SV7 grid thru FM1 C68 for zero** 1, 2 Adjust C68 for zero meter reading. Apply 1 -volt signal input. 2nd 6SV7 grid thru .01 mf FM1 Signal Generator 1, 2 Detune signal generator to point of maximum meter reading. 2nd 6SV7 grid thru .01 mf FMI Peak C67 1, 2 10.7 mc 1st 6SV7 grid thru FM1 Peak C62 & 1, 3 6AQ7GT tube removed from socket. 10.7 mc 6SG7 grid thru .01 mf FM1 Peak C57 & 1, 3 6AQ7GT tube removed from socket. 10.7 mc Cony. grid directly Peak C47 & 1, 3, 6AQ7GT tube removed from socket. 10.7 mc .01 mf 5 6 7 8 9 As in step 5 .01 mf C134 L15 FM1 L14 4 FM RF ALIGNMENT 10 98 mc DIPOLE terminals FM2 98 mc -3.55 to 3.65 in.* Peak C28** 1, 3, 7, 10 Set dial accurately-then adjust C28. 11 98 mc DIPOLE terminals FM2 For max. out- Peak C27 1, 3, 8 Tune dial for maximum outputthen peak C27 while rocking dial. 12 98 mc DIPOLE terminals FM2 Do not change Peak C12 mc -3.25 1, 3, 7, 10 Set dial accurately-then adjust C32. Peak C38 1, 3, 8 Tune dial for maximum output then peak Cr38 while rocking dial. Important! See Note 7, I.* Use insulated hex wrench, 3- inca. DIPOLE terminals FM1 46 14 46 mc. DIPOLE terminals FM1 For max. output 15 46 mc DIPOLE terminals FM1 Do not change Peak C13 Fe to 3.35 in. 1, 3 Peak C324í 46 mc 13 ©John put 1, 3 Rider www.americanradiohistory.com E PAGE GENERAL ELECTRIC CO. SignalSee Generator Frequency Signal Input Point Swít h Adjust Dial Setting 41, 42, 43, 44, 45 Remarks Note SW SF ALIGNMENT accurately-then adjust C31. 16 15.2 me Antenna 'thru 400- SW3 15.2 me -3.7 Peak C31 5, 6, 7, 10 Set dial 17 15.2 me Antenna thru 400ohms SW3 Do not change Peak C37 5, 6, 8 Peak C37 while rocking dial. 5, 6, C9 is located on back apron of chassis ohms in. to 3.8 SW RF ALIGNMENT continued Antenna thru 400ohms SW3 11.$ me Antenna thru 400ohms SW2 20 11.8 me Antenna thru 400ohms 21 11.8 me Antenna thru 400- 18 15.2 me 19 Do not change Peak C9 11 11.8 me -3.35 Peak C34 5, 6, 7, 10 Set dial accurately-then adjust C34 SW2 Do not change Peak C40 5, 6, 8 Peak C40 while rocking dial. SW2 Do not change Peak C14 5, 6, to 3.45 in. ohms 11 9.6 me -4.0 to Peak C33 9.6 me Antenna thru 400ohms SW1 23 9.6 me Antenna thru 400- SW1 Do not change Peak C39 5, 6, 8 24 9.6 me Antenna thru 400ohms SW1 Do not change Peak C15 5, 6, 22 4.1 ohms in. 5., 6, 7, 10 Set dial accurately-then adjust C33. Peak C39 while rocking dial. 11 BROADCAST RF ALIGNMENT 25 1620 kc Antenna thru 200 mmf STD Extreme right- Peak C23 hand position 5, 6 26 1620 kc Antenna thru 200 mmf STD Extreme right- Peak C17 hand position 5, 6 27 1620 kc Antenna thru 200 mmf STD Extreme right- Peak C10 hand position 5, 6, 11 28 1500 kc Antenna thru 200 mmf STD 29 1000 kc Antenna thru 200 mmf 30 l 00 kc 580 kc 31 kc-1.35 Osc. coil L11 iron slug 5, 6, 7, 9 Lii iron slug STD For max. output R -F coil, T3 iron slug 5, 6, 9 T3 iron slug is the center one on left side. Antenna thru 200 mmf STD Do not change Ant. coil, T2 iron slug 5, 6, 9 T2 iron slug is the front one on left side. Antenna thru 200 mmf STD For max. output 5, 6, 8 1500 to 1.45 in. Peak L16 Important! See Note is the rear one on left Peak L16 while rocking dial. 7 Notes in Connection with Alignment Table:. 7. Use unmodulated signal. Connect 20,000 ohms -per -volt meter from junction of R30 and C72 to chassis. Use ten -volt scale (steps 4-6). 3. Connect 20,000 ohms -per -volt meter from grid (pin 2) of 6SV7 LIMITER to chassis with a 200,000 -ohm resistor connected in series. The resistor must be connected directly to the grid so that capacity loading will be negligible and so that the meter is isolated from the i -f signal voltage. Keep signal generator output down so that the meter indicates not more than one volt at the grid (5 microamperes through 200,000 ohms) (alignment steps 7 to 15). 4. Connect signal generator directly to the converter grid at some convenient point. The generator lead must be shielded up to this connection so that not more than 13a inch of exposed lead exists. Ground the shield solidly by clamping it firmly to the chassis or a shield as close to the connection as possible. (Steps 1-3, 9.) 5. Use 400 -cycle modulation. 1. 2. 6. side. Repeat steps 25-31. 32 Connect a standard output meter across the speaker voice coil. Turn volume control fully on. Keep signal generator output down so that the meter indicates not more than i , watt output (1.41 volts) during alignment. If dial scale is not available, index pointer as follows: Turn pointer to right-hand limit of travel. Mark the dial backplate at a reference edge of the pointer slider. Then set pointer by turning dial knob until the indicated dimension exists between the reference edge and the mark. 8. 9. "Rocking" consists of adjusting the indicated adjuster while turning the dial a small amount back -and -forth through peak output. The object is to find the maximum peak. Rocking is necessary and is permissible only when interlocking circuits are being adjusted. The main iron tuning slugs are suspended from the left side of the tuning "elevator." They are individually adjustable by loosening the locknut and turning the supporting screw into which the suspending wire is soldered. Two oscillator settings may give response. The higher frequency response point is the correct one; the other is the image. If in doubt, start with the trimmer screw loosened completely and adjust for the first response. 11. Loop antenna must be plugged in when aligning antenna trimmers C9, C10, C14, and C15. 10. ©John F. Rider www.americanradiohistory.com - MODELS MUSAPHONIC ALIGNMENT TABLE (Cont'd) Step 17 -2AGE 17-14 GE GENERAL ELECTRIC CO. MODELS rdUSAPHONIC 41, 42, 43, 44, 45 V6-6SV7 V5-6SV7 CATHODE +2.5 / ;/ ! \ O SCREEN SCREEN 4153 p 01 PLA7E +z p K3(fN8AN0ONLY) O p 76PLATE o 4111 63A.c. 6.3A C. V4-6SG7 PLATE +235 V7-6A07GT V8-6SC7 PLATE CATHODE BOTTOM VIEW OF CHASSIS SHOWN +2.5 +75 PLATE +68 ALL VOLTAGES MEASURED TO CHASSIS 20,000 31 A.0 3.1 METER. V3-6AK5 A.0 PLATE +155 USING A OHM PER VOLT SCREEN +150 PLATE +150 6.3 A.0 V9-6507 PLATE V2-6AK5 +110 SCREEN +117 VIO-6AL7GT PLATE +187 TUNING EYE 63 6340 A C. SCREEN +79 PLATE +192 6.3 A.0 Figure 10-Socket Voltage Diagram of Main Chassis CATHODE +20 CATHODE+20 CATHODE 3.IA.C. 3.1 A.C. PLATE PLATE CATHODE +20 PLATE 2121. +130 3.IA.C. PLATE CATH.2 PLATE +305 +305 +305 +20 3.IA.C. +4.6 +305 31 A.C. 3.1 A.C. GRID +27 PLATE CAT H. +192 1 +63 V206 V205 V204 5U4G 6V6GT 6V6GT V203 6V6GT V202 V201 6V6GT 6SN7GT BOTTOM VIEW OF CHASSIS SHOWN ALL VOLTAGES MEASURED CHASSIS OHM USING A TO 20,000 PER VOLT METER Figure 11-Socket Voltage Diagram of Power Chassis ©John F. Rider www.americanradiohistory.com 1 I GE PAGE 17-15 GENERAL ELECTRIC CO. Part No. Symbol Description Part No. SPECIALIZED REPLACEMENT PARTS RAB -028 LI RAB -029 LI RAB -030 LI RAB -03; LI RAB-032 LI RAB-033 LI RAB-034 LI RAB-035 LI RAB -042 LI RAB -044 RAD -018 RAD -019 RAD -020 LI RCC-038 RCE-019 ( RCE-032 RCM -001 RCM -002 RCW-024 RCW-025 RCW-1028 RCX-012 RCX-024 RCX-025 C86, 89 C201A, B, C, D C100A, C100B C127 C128 C29 C73, 114 C11, 16, 41, 113, 129, 132 TRIMMER STRIP -Push button TRIMMER STRIP -3-30 mmt., 80-130 mmf., trimmer capacitor TRIMMER STRIP -185-245 mmt., 20-55 mmf., C2, 3, 4, 5, 6 C12, 13 C23, 31, 33, 320-400 34 capacitor RCX-026 C17, 39, 40 RCX-027 C27, 37, 38 RCX-028 C10, 14, RCY-011 RCY-017 C9 C28, 32 15 Champagne KNOB- Plain; KNOB -;Arrow. Pine, Blonde Mahogany, and Champagne KNOB-(Arrow, Mahogany KNOB -(Arrow; Walnut KNOB -(Plain; for Model 45 only KNOB -(Arrow; for Model 45 only POINTER ASSEMBLY -Model 43 only POINTER ASSEMBLY -Models 41, 42, 44, 45 DIAL SCALE ASSEMBLY SCALE -Dial scale PUSH-BUTTON SWITCH ASSEMBLY S6, L17, 18, L19, 20, 21, L22 IRON CORE- -AM tuning RHN-004 RJC-001 RJJ-001 ; J3 PI JI J201 J202 RJS-012 J203 RJS-030 RJS-044 RJS-052 F. EYELET -For connecting FM coil links GROMMET -Rubber grommet for tuning eye cable GROMMET -Rubber grommet for tuner plate. GROMMET -Rubber grommet for tuner plate near tuning shaft GROMMET --For 6SC7 tube socket CUSHION -Dial scale LINK -Hoist link, holding end of hoist cord RING --Retaining ring for shaft, mounting pushbutton keys NUT -Hex nut for tuning vane adjustment CONTACT PIN --For speaker connection RECEPTACLE -Receptacle for octal plug on receiver chassis RECEPTACLE --For loop RECEPTACLE -6AL7 tuning eye socket PLUG--Male phono input, from preamplifier SHELL -For loop plug RECEPTACLE -117 V. a -c output to SPU - RHG -010 RHM-012 RHM-024 RHM-025 ©John Mahogany KNOB--; Plain Walnut RHG -008 RHG -009 RJS-017 trimmer TRIMMER STRIP- 3-30 mmf., 3.30 mmf., trimmer capacitor KEY --Push-button key ,brown KEY -Push-button key tan, CORD -Hoist cord, 6412 inches long DRIVE CORD ASSEMBLY FELT WASHER -.Dark ;, fºr control knobs FELT WASHER -,Light,. for control knobs FELT STRIP --Dial scale KNOB --,Plain; Pine, Blonde Mahogany, and RHG -007 RJJ-002 RJJ-003 RJP-004 RJP-006 RJP-007 RJP-008 RJP-009 RJP-0I5 mmf., 5-45 mmf., trimmer capacitor CAPACITOR -2-20 mmf , trimmer RDK-043 RDK -044 RDK -045 REI -006 RHE-001 165-225 TRIMMER STRIP -20-S5 mmf., 475-575 mmf., 320-400 mml., trimmer capacitor TRIMMER STRIP -2-20 mmf., 185-245 mmf-, 34-70 mmf., trimmer capacitor TRIMMER STRIP -34-70 mmf., 40-80 mmf., RDB-006 RDB-007 ROC -019 ROC -025 RDF-003 RDF-006 RDF-008 RDK- 042 RDK-046 RDK-047 RDK-092 RDK-080 RDP-025 RDP-026 RDS-023 RDS-045 RDX -020 mmf., 41, 42, 43, 44, 45 Description SPECIALIZED REPLACEMENT PARTS (Cont'd) LOOP AND BACK ASSEMBLY -Model 41, Walnut LOOP AND BACK ASSEMBLY -Model 41, Mahogany LOOP AND BACK ASSEMBLY --Model 41, Blonde Mahogany LOOP AND BACK ASSEMBLY -Model 42, Mahogany LOOP AND BACK ASSEMBLY -Model 43, Knotty Pine LOOP AND BACK ASSEMBLY --Model 44, Walnut LOOP AND BACK ASSEMBLY ---Model 44, Mahogany LOOP AND BACK ASSEMBLY -Model 44, Champagne Finish Mahogany LOOP AND BACK ASSEMBLY -Model 42, Mahogany, 50 cycles BACK AND LOOP ASSEMBLY --Model 45 BRACKET Rand switch frond BRACKET -Band switch (rear) BRACKET -For coil on rear bracket of band switch MOUNTING BRACKET --Dial scale BEZEL -Dark BEZEL -Light BRACKET AND ROLLER FORK ASSEMBLY -For tuning hoist CAPACITOR -.004 mfd., 600 v., paper CAPACITOR -30 mfd., 15 mfd., 30 mfd., 30 mfd., electrolytic CAPACITOR -30 mid., 400 v., electrolytic CAPACITOR -30 mid., 350 v., electrolytic CAPACITOR -.01 mid., metal cased CAPACITOR --.01 mid., metal cased CAPACITOR -44 mmt., ceramic CAPACITOR -4.7 mmt., ceramic CAPACITOR -100 mmt., ceramic RAD -023 RAL.001 RAL -002 RAX-014 Symbol MODELS IAUSAPHONIC R3S-065 RJS-066 RJS-073 RJS-085 RJX-003 R JX-005 J3 P202 RJX-006 RLA-006 RLA-009 RLA-012 T1 RLB-006 RLB-008 RLB-009 RLC-015 RLC-016 RLC-017 RLF-003 RLF-010 LI -005 LI -002 RLI-018 RLP-005 RLP-008 RLP-018 RLX-002 T3 T2 L4, 13, 28 L6 L3 LI0 L16 L8 L24 L201 L13 L12 L25 L14, 15 L5, 26 L5 RLX-003 RMC-012 RMC-013 RMF-003 RMM-009 RMM-010 RMM-01I RMM-034 RMM-035 RMM-036 RMMs037 RMR-002 RMS-039 RMS-040 R MS -041 RMS-042 RMS-043 RMS.044 RMS.076 RMS-078 RMU-a30 RMU.031 RMW-013 RMW-016 RMrV018 RMW-032 RMX-006 RMX-018 RMX-019 RMX-021 RMX-094 RRC-026 RRC-027 RRC-0S0 RRT-001 RRW-016 RSP-004 RSP-006 RSS-003 RSW-029 RSX-010 RTD-001 RTL -017 RTL -022 RTL -043 RTO-026 RTP-035 RTP-036 RWL-004 R45A, B R202A, B R201 S7 SI T7 T4 T5 T6 T202 T201 T201 RWM-001 P201 RWM-003 P201 RWM-004 P201 RWM-005 P201 RYC-006 RYC-007 RYC-008 chassis PLUG- -On power cable RECEPTACLE-Special power unit a -c RECEPTACLE-For pilot light and speaker cable plug MOUNTING PLATE --For mounting electrolytic on SPU chassis TUBE SOCKET -Octal base socket on SPU chassis SOCKET -For tubes V4, V5, V6, and V7 TUBE SOCKET -Tube socket for VI, V2, and V3 SOCKET -Tube socket for V9, V201. V202. V203, V204, V205, and V206 Rider www.americanradiohistory.com SOCKET -Pilot light socket and leads MOUNTING PLATE -Electrolytic mounting plate, on SPU chassis SOCKET- Phono -lite socket SOCKET--Tube socket for V8 RECEPTACLE -Phono input PLUG- 4 -pin amphenol for pilot light and speaker cable OCTAL PLUG RECEPTACLE AND LOCK RING- For power receptacle on main chassis B.C.P.B. ANTENNA TRANSFORMER COIL --Broadcast band antenna coil COIL --FM antenna choke, FMI oscillator cathode choke, oscillator cathode choke COIL -Broadcast band RF coil COIL --SW band RF plate choke coil COIL --Broadcast RF primary dummy COIL -SW oscillator loading coil COIL -Broadcast band oscillator shunt coil COIL --SW band RF loading coil CHOKE -IF filament choke CHOKE -- Filter for power supply CHOKE- FM power line choke CHOKE --FM oscillator cathode choke COIL--SW2 loop shunt coil CHOKE --IF plate choke COIL- -FM choke; RF plate and IF wavetrap COIL -FM RF plate choke COIL AND MOUNTING BRACKET ASSEMBLY --For ^os' buttons TRIMMER STRIP BRACKET AND COIL ASSEMBLY ---For push buttons CLAMP- -For holding cover on RF unit CLIP -Support for clamp, holding cover on RF unit CLIP- For tube shield on 6AQ7GT SPACER-Metal sleeve on hoist pulley shaft VANE -Tuner vane for FM coils L2 and L7 VANE -Tuner vane for FM oscillator coil L9 SHIELD -Lite shield for bezel SHIELD -Tube shield for 6AQ7GT SUPPORT -Fibre support for push-button coils DRAWER SLIDES -Cabinet drawer slides ROLLER --Presses against hoist shaft WASHER --"C" washer for idler pulley shaft SPRING -Flat spring against hoiat pulley shaft SPRING --Wire spring against hoist pulley shaft SPRING -Hoist cord tension spring SCREW -Iron core adjusting screw SPRING --Guide wire connecting tuning vines to adjustment screws SCREW --For tuning vane adjustment SPRING Type 2 dial cord spring 'late production; SHAFT ---For mounting push-button keys SHAFT -Tuning shaft FLYWHEEL -Less setscrew PULLEY -Main tuning drum PULLEY -Hoist PULLEY --Idler pulley for dial cord CABLE ASSEMBLY --For tuning eye FLYWHEEL -With setscrew PULLEY-Hoist pulley and shaft TUNER TOP PLATE AND SHAFT ASSEMBLY BRACKET AND SPRING ASSEMBLY -For push buttons TONE CONTROL ASSEMBLY --Bass TONE CONTROL ASSEMBLY -Treble RESISTOR --2 meg., dual potentiometer RESISTOR -900 ohms, 6 w., 150 ohms, 6 w.. wirewound RESISTOR -100 ohms, 2 w., variable resistor SWITCH -Push-button switch PLUG -Loop plug SWITCH -Squelch switch SWITCH -Band change switch SWITCH ASSEMBLY -Phono-lite FM DISCRIMINATOR TRANSFORMER BC 1st IF TRANSFORMER BC 2nd IF TRANSFORMER BROADCAST 3rd IF TRANSFORMER TRANSFORMER -Audio output to speakers TRANSFORMER -Power transformer, 60 cycles TRANSFORMER --Power transformer, 50 cycles CORD AND PLUG --For 117 v. a -c to main chassis CORD -Cord and plug for 117 v. a -c to special power unit, Model 41 and 42 CORD -Cord and plug for 117 v. a -c to special power unit, Model 43 CORD --Cord and plug for 117 v. a -c to special power unit, Model 44 CORD -Cord and plug for 117 v. a -c to special power unit, Model 45 TAB- --Push-button key tab phono; STATION CALL LETTERS-For push-button ; keys TAB --Push-button key tab (OFF, PAGE 17-16 GE MODELS 60, 62 GENERAL ELECTRIC CO. N 0 xv ei g o ,n C M LLao o R. 1'..r f3: --e5 0 -6-eu ÿ C u o y N 0 ÿ áO u A y ^'c,,:b1 I C O b d ti l'..1.' 120 b. a D . úT O syy O v'ó ÿ ú Q Q ii W d F W '0 ? w i-.,xq 0 b Ó Ux3A 00 W {1 u Fir _ L J > w n I Ó John F. Rider www.americanradiohistory.com u tl C 0 .,, O C ó ó v O 0 U h.bo. U. Hvo7ú R ., O z,,,`"3 0 ó V C o m.b E C m N . y p m N 8 0 vbv O,C C ti GE PAGE 17-17 GENERAL ELECTRIC CO. CLOCK SERVICE Figure 4 shows clock parts referred to in the following paragraphs and the parts list. MODELS 60, 62 ALARM AND SWITCH ADJUSTMENTS I. Turn Alarm-Radio shaft to ALARM position. 2. Slowly rotate Time Set shaft clockwise until the contacts of the Switch Assembly (B) close. CLOCK MOVEMENT DISASSEMBLY 1. Remove clock movement frjrt case. When removing knobs, note that the Alarm -Set knob is a left-hand thread, while Alarm -Radio is a pull -off knob. 2. Remove Bezel, Hands and Dial Face. 3. Remove the motor assembly by removing two screws (A) and break two soldered joints on Field. The Field and Rotor Assembly (R) can now be removed. The Rotor is held by friction only to the Field. 4. Remove Switch Assembly (B) by removing two screws from base plate. 5. Remove Switch Shaft Assembly (C) and spacer. 6. Remove Alarm -Set Shaft Assembly (D) and spacer. 7. Remove the three front plate assembly screws that are located under the Dial Face and then remove Front Plate. 8. Remove Alarm Gear Sleeve Assembly (E), Hour Gear Sleeve Assembly (F), Minute Gear Sleeve Assembly (G), and Sweep Second Gear Shaft Assembly {H). 9. Remove Alarm Cam Gear Assembly (I) and Spring Washer (J). 10. Remove Alarm -Set Gear (K). 11. Remove Time -Set Gear and Shaft Assembly (L). 12. Remove Switch Cam Lever (M). 3. Replace Dial Face, Alarm Dial, the Minute, Hour and Second Hands. Set all Hands and Dial so that they indicate 12 o'clock. Make sure all Hands and Alarm Dial are tight on their respective shafts. 4. With Alai m Set knob pulled out, continue to rotate Time Set shaft clockwise and note that the vibrator arm (N) drops against field core approximately 7-10 minutes later. 5. Set alarm at some other selected position and make sure mechanism actuates within limits (* 1 minute). 6. Check alarm tone of vibrator. This can be adjusted by either bending vibrator arm nearer or farther away from field core. Bend arm near anchor point. CLEANING AND LUBRICATION To clean, completely disassemble and clean all moving parts in carbon tetrachloride or some similar cleaner. The inside of the sleeves and shaft surfaces may be cleaned of oxidized oil by rubbing with a fine grade of steel wool dampened in carbon tetrachloride. Do not use too much oil and apply rby means of a small wire (drop oiler). Too much oil collects dust and later oxidizes. Use only recommended clock oil, such as Nye's Celebrated Oil which may be purchased from Wm. F. Nye Co., Inc., New Bedford, or equivalent. CLOCK MOVEMENT REASSEMBLY Reassemble in the reverse order of disassembly, observing the following precautions: CLOCK TROUBLES 1. The spring washer (J) should curve away from the gear when placed on the Alarm Cam Gear. Assembly (I). 1. Clock will not operate -Defective field coil, defective 2. The Switch Cam Lever (M) fork must straddle the rotor, binding of parts. base plate post as shown in the illustration. 2. Clock loses time-Binding parts, too little friction on 3. After reassembly of front plate, check the Sweep minute hand sleeve assembly, defective rotor. Clock time set Second Gear (H) through the hole in the base plate to make shaft bent and rubs against hole in clock bracket sure it is free to turn. 3. Noisy Clock --Rotor defective, alarm armature im4. Proceed with Alarm and Switch Adjustments as deproperly adjusted, loose parts. or binding of moving parts. scribed below before installing hands. RADIO REPLACEMENT PARTS LIST Cat. No. Symbol Description Cat. No. UNIVERSAL G -E REPLACEMENT PARTS UCC-623 UCC-630 UCC-635 C22 UCU-036 UCU-040 UC W -020 C19 CI, 17, 20 CS, 10, 11, 21 Cl6 C25 LS1 R15 UOP-418 URD-029 URD-081 URD-113 URD-129 URD-141 URF-051 RI R2, 13, 14 Rio R12 R16 SPECIALIZED G -E REPLACEMENT PARTS CAPACITOR- .003 mf., 600 v., paper CAPACITOR -.01 mf., 600 v., paper CAPACITOR -.05 mf., 600 v. RAU-021 CAPACITOR --220 malt., mica CAPACITOR - 330 mimt., mica CAPACITOR -47 =IL, ceramic SPEAKER-4 -inch PM speaker RESISTOR -150 ohms, (. w., carbon RESISTOR --22,000 ohms, 3 w., carbon RESISTOR 470,000 ohms, !z w., carbon RESISTOR -2.2 meg., l- w., carbon RESISTOR --6.8 meg., b4 w., carbon RESISTOR - 1200 ohms, 2 w., carbon SPECIALIZED G -E REPLACEMENT PARTS RAB -054 ! Ll RAU -020 BACK-Cabinet back cover (includes loop antenna) CABINET -Mahogany plastic cabinet 60) Description Symbol ( Model RCE-050 C23A, RCT-021 C2A, B B RDK-028 RDK-094 RDS-047 RDS-050 RJS-003 US-006 RLC-051 RRC-054 CABINET --Ivory plastic cabinet (Model 62) CAPACITOR SO mid., 150 v.; SO mid., 150 v., dry electrolytic CONDENSER -Tuning condenser, oscillator, and r -f section KNOB Volume control knob Models 60 or t 621 KNOB Tuning dial wheel Models 60 or 621 SCA LE Dial scale Model 601 SCALE Dial scale Model 621 SOCKET -Octal tube socket Type 12SA71 SOCKET -Octal tube socket COIL Oscillator coil POTENTIOMETER 0.5 megohm, volume control RESISTOR -I8 ohms, I watt, wirewound TRANSFORMER - 1st I -F transformer TRANSFORMER - 2nd I -F transformer TRANSFORMER Output transformer CORD -Power cord, brown Model 60) CORD --Power cord, white (Model 62) CLOCK -60 cycle, 105-125 v., clock assembly CLOCK -50 cycle, 105-125 v., clock assembly i t t i T4 Rll RRW-008 RTL -050 RTL -05I RTO-036 RWL-009 Rl7 RZC-005 RZC-006 M1 MI R W L-014 (Cont'd) TI T2 T3 - ( CLOCK REPLACEMENT PARTS LIST Cat. No. Symbol Description Cat. No. MISCELLANEOUS XC3X49 XC4X5 Q XC 10X 131 L XC11X11 XC31X26 XC32X167 XC34X 139 XC53X100 XC54X29 XC55X11 XC58X16 XC59X234 XC59X699 XC59X716 D O CLOCK MOVEMENT TIME SET SHAFT KNOB -Bronze ALARM SET KNOB -Ivory TIME SET GEAR AND SHAFT ASSEMBLY ALARM SET SHAFT ASSEMBLY SWEEP SECOND HAND HOUR AND MINUTE HANDS FRONTPLATE ASSEMBLY INNER BEZEL -2 s. ,,; in., round, maroon OUTER BEZEL --Brass ALARM DIAL 9 CRYSTAL is in., round -2 C XC60X7I2 NUMERAL COLOR RING -Bronze SWITCH SHAFT ASSEMBIY SWITCH KNOB -Ivory DIAL FACE -(On froatplate) CLOCK MOVEMENT XC1X1 XC1X2 XC1X6 XC1X43 XC13XI1 A F Description Symbol SCREW --Holds Field, No. 4-40X1'w in. R.H. No. 1204 LOCKWASHER SCREW No. 4-40 z % in. R.H. HEX NUT HOUR GEAR SLEEVE ASSEMBLY XC14X15 XC1SX3 XC16X14 G E H (Cont'd) MIItUTE GEAR SLEEVE ASSEMBLY ALARM GEAR SLEEVE ASSEMBLY SWEP SECOND GEAR SHAFT ASSEMBLYALARM XC17X8 XC35X39 XC40X13 XC4oX76 XC40X77 XC40X78 XC40X79 XC40X80 XC40X202 XC40X252 XC4oX260 XC40X261 XC40X262 XC40X263 XC44X38 XC45X69 XC64X1-2-3 ©John F. Rider www.americanradiohistory.com K M J R GEAR SHAFT ASSEMBLY BASEPLATE ASSEMBLY RIVET -Vibrator SWITCH ASSEMBLY -Consists of: Contact Block Contact Block Contact Spring Insulator ALARM SET GEAR ASSEMBLY SWITCH CAM LEVER ASSEMBLY UPPER CONTACT SPRING ASSEMBLY LOWER CONTACT SPRING AND TIP ASSEMBLY SPREADER POST CAM GEAR SPRING WASHER SPACER -Switch shaft TIME SET SHAFT SPACER TIME SET SHAFT SPACER ALARM SHUT-OFF SPACER ROTOR UNIT -60 cycles FIELD COIL ASSEMBLY 60 cycle FRONTPLATE SCREW - PAGE 17-18 GE ©John F. Rider www.americanradiohistory.com GE PAGE 17-19 GENERAL ELECTRIC CO. YRB It SAT 12 79-1, MlJD%I, YRB 79-2, YRB 83-1 SOLSST 5K7 71 CI? á cºAI RI _--- cl \CS \ . e C2 n-- PKR Oil --Rio\^"---R--1 GIº Re I 5 n R2 -\//N` G3e 0135 Y TGIa 3525GT IF PEAK 455 KC 15 56712557._ a 7 T Z 014 7-V Fig. 3. 2 R9 12557 7 SOUS 7 2 7 3 2 Schematic Diagram PARTS DESCRIPTION LIST MODELS YRB Description Symbol C1 C2A C2B C3 C8 C9 CIO Cil C12 C13A C13B I 83-1, C14 C15 C16 C17 L1 L2 L3 L4 Pl TI YRB 79-2 Description Symbol Antenna trimmer condenser Tuning condenser, antenna section Tuning condenser, oscillator section Oscillator trimmer condenser 220 mmfd mica capacitor .005 mfd paper capacitor 220 mmfd mica capacitor .01 mfd paper capacitor .02 mfd paper capacitor 30 mfd electrolytic capacitor 30 mfd electrolytic capacitor 79-1, YRB Symbol .05 mfd paper capacitor .05 mfd paper capacitor .05 mfd paper capacitor R1 R2 R3 R4 RS R6 R7 paper capacitor 1st I.F. transformer 2nd I.F. transformer Loop assembly .01 mfd " Oscillator coil Pilot lamp Output transformer R8 R9 RIO Description 22,000 ohm carbon resistor 2.2 megohm carbon resistor Volume control, .5 megohm 4.7 megohm carbon resistor 470,000 ohm carbon resistor 470,000 ohm carbon resistor ISO ohm carbon resistor 2700 ohm carbon resistor 18 -ohm carbon resistor 470 ohm carbon resistor REPLACEMENT PARTS LIST MODELS YRB 83-1, Description Stock No. 79-1, YRB Stock No. SPECIALIZED G-E REPLACEMENT PARTS SAB SAB SAU SAU SAV SCE 004 005 007 008 004 002 SCT 002 SDC 001 SDK 001 SDK 010 SDK 011 SDP 001 SDS 004 SDS 005 SHC 001 SJP 002 SJS 001 SJS 003 SLC 001 SLL 001 SMF 003 SM S001 SMU 001 SMF 002 Back cover, Model YRB 83-1 Back cover, Models YRB 79-1, 79-2 Cabinet, Model YRB 79-1 Cabinet, Model YRB 79-2 Cabinet, Model YRB 83-1 Capacitor, filter electrolytic, 30-30 mfd, 150 volts, SMW 001 SRC 003 STL 001 STL 002 STO 001 SWL 001 ©John F. Rider www.americanradiohistory.com 79-2 Description Pulley, dial drive wood Volume control, 0.5 megohm with power switch Transformer, 1st I.F. Transformer, 2nd I.F. Transformer, output Power cord UNIVERSAL G-E REPLACEMENT PARTS C13A, C13B Capacitor, tuning, C2A, C2B Dial drive cord Knob, Model YRB 83-1 Knob, Model YRB 79-1 Knob, Model YRB 79-2 Pointer. Dial scale Dial scale, Model YRB 83-1 Dial scale, Models YRB 79-1, 79-2 Hair pin cotter for dial drive Connector, female to speaker Pilot lamp socket Socket, octal tube Oscillator coil Antenna loop Fastener, back cover to cabinet Spring, dial drive drum Shaft. dial drive Snap button YRB UCC UCC UCC UCC UCU UDL 039 040 041 045 1036 013 UOP 526 URD 007 URD 029 URD URD URD URD URD URE 041 081 113 129 137 059 Capacitor, .005 mfd paper, C9 Capacitor, .01 mfd paper, C17 Capacitor, .02 mfd paper, C12 Capacitor, .05 mfd paper, C14, C15, C16 Capacitor, 220 mmfd mica, C8, C10 Pilot lamp, Mazda 51 Speaker, S 13 -in. PM dynamic Resistor, 18 ohm % watt carbon, R9 Resistor, 150 ohm ke watt carbon, R7 watt carbon, RIO Resistor, 470 ohm Resistor, 22,000 ohm SS watt carbon, Rl Resistor, 470,000 ohm 34 watt carbon, R5, R6 Resistor, 2.2 megohm SS watt carbon, R2 Resistor, 4.7 megohm Sii watt carbon, R4 Resistor, 2700 ohm 1 watt carbon, R8 PAGE 17-20 GE MODELS YU 79-1, YRB 79-2, YRB 83-1 Rating: GENERAL ELECTRIC CO. 105-125 volts d -c 105-125 volts 40-60 cycles a -c 28 watts at 117 volts Intermediate Frequency: V" MAGNET DYNAMIC Outside Cone Diameter Voice Coil Impedance (400 cycles) l-3t y OREGTIiI[fR 35ZSGT - M10.1FlPÉÑE/_T o_ C) I 2ND® DETECTOR B MnETAAEafeR 12501 o ( IST®I.F e 111 540-1720 KC 455 KC Tuning Frequency Range' ANTENNA LOOP UNE CORD F AAPLIFIER 125NT F I -2 o®o TUNING CAPACITOR C2A-R 3 3 5% in. 2 ohms PULLET .12:g1 TUBES Rectifier Pilot Lamp jj ® LOUDSPEAKER "ALNICO Converter and Oscillator I.F. Amplifier Det. Audio, AVC Power Output Go254)p-!L o SWITCH VMWE CWTROL SHAFT 12SA7 DIAL POINTER CORD NNW CONTROL SHAFT 12SK7 Fig. I. Tube and Trimmer Location 12SQ7 50L6GT I.F. AUGNMENT 35Z5GT Connect an output meter across the voice coil. Turn the GE 51 volume control to maximum. Set test oscillator to 455 KC and keep the oscillator output as low as a readable meter reading will permit. GENERAL INFORMATION Apply signal to the converter grid through a .05 mfd capacitor and align progressively the trimmers in the 2nd Model YRB 83-1 is a 5 -tube (including rectifier) super- and 1st I.F. transformer cans. heterodyne receiver in a distinctively styled wood cabinet; Models YRB 79-1 and YRB 79-2 are of rich brown or ivory R.F. AUGNMENT plastic cabinets. These receivers incorporate built-in antenna Apply the R.F. alignment signals through a standard automatic volume control, oversize permanent magnet I.R.E. dummy antenna to the receiver antenna post. With speaker, and beam power output. the gang condenser wide open, align the oscillator trimmer (C17B) to 1720 KC. Change the generator signal to 1500 KC, ALIGNMENT PROCEDURE tune the receiver to the signal and peak antenna trimmer (C17A) for maximum output. AUGNMENT FREQUENCIES 455 KC I.F. PRECAUTION 1720 and 1500 KC R.F If the signal generator is A -C operated, use an isolating The location of all trimmers is shown in Fig. 1. transformer between the power supply and the radio receiver power input. The use of an isolating capacitor is not recommended, as A -C through the capacitor will introduce hum modulation and/or create the possibility of a burned -out signal generator attenuator. FRONT OF CHASSIS 12S07 * A.C. VOLTS 1000 OHMS PER VOLT *300 VOLT SCALE Model YRB 83-1 50L6GT 35Z5GT/G 11113 o 0 120 114 125K7 12SA7 *2s 20 * I 17 0 -----.+R+.. BOTTOM VIEW OF CHASSIS LINE VOLTS - 117 Model YRB 79-2 ©John F. VOL. CONT. MAX. Fig. 2. NO SIGNAL Socket Vollage Diagram Rider www.americanradiohistory.com 0 0 GE PAGE 17-21 MODEL 140 GENERAL ELECTRIC CO. t« v a+ 4 ,'d A c V'cr ° ld o ' n W é I m nI H C v Çvîí°+ nv. o m%°' uluú Ó8 p v O>.,uo y-0.,5.1 L1 mv o. p G O r a v.ñ 0.1.4 u +, U>.Gcovcó AA.c I 0 i2 LL U CJa°i. 515 n cR1 8 c d" 3v'" á g« m C º':0,1 c m l0 (q Ñ Ul'N V .u, tu . b O 4: 118;.!u."y 3'ô v... N w rx æ$ TM_ °-m .0 H r Q ,y 00 ó cr co LL Úp Q u N ewin Q /VVVh f 50 nN Kp¡ tp m ^// --1Ú- U ( U z oU . Ct N§ a ,o CD a ri/VVVWr ,V ¢ó N ¢ n !I ( Túc n a P ©John F. ° WO woo crn - 1- ú ° aU Q.c. °'Rl h'ú y -VVVVti o ó u 0. 0. h Rider www.americanradiohistory.com s O .c7 m c E ttl L y0 ,ap 0 ív+ ÿ^ ., 3 PAGE 17-22 GE MODEL 140 GENERAL ELECTRIC CO. CABINET INTERLOCK Primarily as a safety device, so that contact with live wires and short circuits be avoided, the interlock provides a means by which the AC -DC power cord circuit is broken when the receiver chassis is taken out from the cabinet for battery replacement or receiver servicing. The interlock receptacle is mounted in the top of and on the right side of the cabinet, while the interlock plug is mounted in the top of the receiver chassis so that its pins align with the receptacle. BATTERY-AC OR DC SELECTOR SWITCH A selector switch S2 located on the front of the panel near the bottom selects operation from the internal battery source, in the position marked "Batt." The other position of the selector switch marked AC -DC prepares the receiver for operation from the external power outlet for which a power cord and plug is provided. DOOR SWITCH The door switch S1 -A, -B functions as the on -off switch in the receiver. Sl -A, -B operates so* that when the cabinet door is closed the "A" battery positive lead circuit is broken by contacts S1 -B, and one side of the AC -DC power cord circuit is broken by contacts S1 -A. Rather than adjust the trimmer at random, it would be helpful to learn whether more or less capacity is necessary. This can be done by wanding the radio antenna loop for an indicated gain. "Wanding" is the procedure where more or less gain will be indicated by an increase or decrease in output when a shorted one -turn loop is coupled to the radio antenna loop. If a gain is indicated the trimmer capacity must be decreased. In a similar manner, a field of powdered iron cores may be coupled to the loop. In this case a gain would indicate that capacity must be increased. When no gain is apparent with either the shorted turn wand or the iron field wand, the adjustment of the trimmer is peaked. 2ND. IST. I.F ANT. TRIMMER C-Ia / I F. T2 TI (ADJUST (-ADJUST TOP & BOTTOM TOP B BOTTOM E OSC. TRIMMER C-28 FUZ) OSC. PADDER C-3 ELECTRICAL CIRCUIT ALIGNMENT AUGNMENT FREQUENCIES R -F I -F 1620, 1500 and 580 kc 455 kc ANT. TRIMMER CIB AND OSC. TRIMMER C-28 LOCATED ON FRAME OF GANGED TUNING CAPACITOR CIA a C2A, OSCILLATOR PADDER NEAR TUNING CAPACITOR EQUIPMENT REQUIRED 1. 2. 3. 4. 5. Test oscillator with tone modulation. A -c output meter. .05 mfd. paper capacitor. Insulated screwdriver. Insulated screwdriver blade with flexible coupling. 1. The alignment procedure is given in table form. The major part of alignment will be made with the chassis removed from the cabinet. The location of i -f and r -f adjustments is shown in Figure 2. There are two adjustments for each i -f transformer, one in the top, the other in the bottom. To adjust the bottom slugs, it will be necessary to use an insulated screwdriver blade with some form of flexible coupling. 2. The output meter should be connected across the voice coil terminals on the speaker. The low side of the test oscillator output should be connected to the chassis ground; the high side of the oscillator output should be connected as indicated in the Alignment Chart. During the entire alignment procedure, the volume control should be at its maximum (clockwise) position. The test oscillator should be attenuated so that the output meter reading doesn't exceed z volt. 3. For alignment of the oscillator trimmer, oscillator pad der and converter trimmer the input signal should be inductively coupled to the radio loop antenna, Ll, by connecting a four -turn, six-inch diameter loop of bell wire across the signal generator output terminals, and then locate the loop about one foot from the radio loop antenna. To prevent possible errors in peak readings, the position of the loop with respect to the radio loop antenna should not be changed during any one set of adjustments. 4. In step 6 of the Alignment Chart, "Rocking -in" of the oscillator's padder consists of turning the dial back -and -forth through signal for maximum while peaking the oscillator padder. Since the cabinet has a definite effect upon the align5. ment because of its shielding of r -f components, it will be necessary to "touch-up" the converter trimmer after the major alignment is completed and the chassis assembled back into the cabinet. It is obvious that the adjustment must be made while the chassis is exposed and the output readings taken with the chassis and cabinet assembled. I F. Tube and Trimmer Location ALIGNMENT CHART Test Oscilla tor Test Step Connect Oscillator to AUGNMENT PROCEDURE ©John Fig. 2. Setting Radio Dial Setting Adjust for Maxi mum Output I -F ALIGNMENT 1U4 i -f grid (pin 6) in series with .05 mfd. 2 3 Cony. trimmer lug Cl -B in series with .05 mfd. Repeat steps and , 455 kc 550 kc 2nd i -f transformer (T2) cores 455 kc 550 kc 1st i -f transformer (T1) cores 1 2 R -F ALIGNMENT 4 Inductively 1620 kc Inductively 1500 kc Inductively 580 kc Inductively 1500 kc coupled 5 coupled 6 coupled 7 coupled Rider www.americanradiohistory.com Max. freq. cond. open Oscillator trimmer, C2 -B. 1500 kc ,Converter C1 -B. trimmer, For max. Rock -in oscillator padder, C3 (see General Procedure, 4). 1500 kc Converter trimmer, 1C1 -B. GE PAGE 17-23 MODEL 140 GENERAL ELECTRIC CO. VIEW FROM BOTTOM OF CHASSIS I 3S4 R5 IR5 2.65 I. 1.35 56 IU4 14 3.95 IU4 20 2.65 70 19 CONDITION OF TEST RECEIVER POWERED BY AC -DC LINE 117 V. MEASURED WITH 20,000 OHM/VOLT METER ALL VOLTAGES TAKEN BETWEEN SOCKET PIN 8 B SWITCH S-2 IN AC -DC POSITION CONDITION OF TEST RECEIVER POWERED BY BATTERY SUPPLY MEASURED WITH 20000 OHM/VOLT METER ALL VOLTAGES TAKEN BETWEEN SOCKET PIN a SWITCH S-2 IN BATTERY POSITION Fig. 3. B STAGE GAIN AND VOLTAGE CHECKS Stage gain by vacuum tube voltmeter or similar measuring devices may be used to check circuit performances and isolate trouble. The gain values listed may have tolerances of 20 per cent. Readings should be taken with low signal input so that AVC is not effective. (1) R -F STAGE GAINS. IR5 cony. grid to 1U4 i -f grid .. 1U4 i -f grid for .05 w. output Cat. No. Fig. 4. Socket Voltage Diagram Symbol 28 at 1000 kc 3600 uy at 455 kc Description AUDIO GAIN. .040 volt at 400 cycles across volume control (R6) with control set at maximum will give approximately .05 watt output across speaker voice coil. D -c voltage developed across oscillator grid resistor R1 averages 16.2 volts at 1000 kc. SOCKET PIN VOLTAGES. Figures 3 and 4 show voltages from all tube pins to B-. Voltage readings much lower than those specified may help localize defective components or tubes. Cat. No. C23 C19 C24 C4 C11 C10 R10 CAPACITOR -.05 mf., 400 v., paper CAPACITOR --.1 mf., 600 v., paper CAPACITOR -430 mmf., silver mica CAPACITOR- -100 mmf., mica CAPACITOR -220 mmf., mica CAPACITOR -330 mmf., mica RESISTOR -68 ohms, h w., carbon SPECIALIZED REPLACEMENT PARTS (Cont.) HINGE --For door to cord access SHIELD -Tube shield for 1S5 tube HANDLE ASSEMBLY -With retainers and cover BARRIER -Fibre strip insulator between switch S2 and chassis SHIELD -Fibre strip insulator between switch S2 and escutcheon STRIP -Insulating strip (insulates right side of chassis from cabinet) STRIP -Insulating strip (insulates left aide of chassis from cabinet) BARRIER Fibre insulating barrier insulating rectifier from chassis RECEPTACLE ASSEMBLY -Female interlock mounted on cabinet PLUG ASSEMBLY --Male interlock plug, fits into female interlock receptacle SOCKET --Tube socket for IR5, 1U4 and 3S4 SOCKET --Tube socket for 1S5 (rubber mounted) COIL Oscillator LOOP -Antenna loop only BATTERY CUP ASSEMBLY --"A" battery negative connector BRACKET ASSEMBLY -(With shield barrier) for mounting volume control and tuning capacitor BATTERY CONNECTOR ASSEMBLY -Consists of one copper and two fibre strips ("A" positive) RHI-004 RH S-010 RHY-006 RII -00Z RII -003 - RII -004 RII -005 SPECIALIZED REPLACEMENT PARTS RII -007 RJJ-006 RAC -046 RAD -027 RAD -028 RAT -007 RAX-016 RA X-017 ACC -075 ACC -076 ACC -077 RCC-078 RCE-051 RCE-052 RCT-023 RC W -020 RCY-030 RDE-026 RDK-098 RDK-099 REC-001 REX -004 RHC-008 RHC-013 RHF-002 RHG -014 RHH-007 RH H-008 R HI -002 R H I-003 ©John COVER- (Plastic) for cabinet door DOOR -For cabinet (with loop connecting strips only) DOOR --Door access to power cord, (less hinge) CABINET ASSEMBLY-- Complete with handle assembly, handle retainers, interlock receptacle, and trim DOOR ASSEMBLY- With loop Ll DOOR ASSEMBLY -Door access to power cord, with hinge and tab C12, 21 CAPACITOR- .01 mf., 400 v., paper C9, 13 CAPACITOR .005 mf., paper C15, 17, 18 CAPACITOR .1 mf., paper C16 CAPACITOR -.05 mf., paper C20A, B CAPACITOR 40 mf., electrolytic C14 CAPACITOR -- 90 mf., electrolytic C1, 2 CAPACITOR -Tuning capacitor C25 CAPACITOR 10 mmf., ceramic C3 CAPACITOR Oscillator padder ESCUTCHEON KNOB ASSEMBLY Door knob and lock spring KNOB ASSEMBLY -Knob with spring for volume or tuning control CONNECTOR -Contact strip for "B" battery RECTIFIER ASSEMBLY CLIP -For mounting C20A, B, 40 mf. dual electrolytic capacitor COTTER PIN -(Hair pin type) inserted in tube socket shield FELT FOOT -On bottom of receiver GROMMET Fibre grommet for power cord RETAINER -Plastic handle retainer (right) RETAINER -Plastic handle retainer (left) HINGE Cabinet door top hinge HINGE -Cabinet door bottom hinge - F. Description Symbol UNIVERSAL REPLACEMENT PARTS UCC-028 UCC-048 UCG-543 UCU-528 UCU-536 U C U-540 URD-1146 Socket Voltage Diagram RJP-017 RJS-090 RJS-091 RLC-054 RLL-024 R M C-018 L2 LI RMX-103 RMX-104 ROP-012 RRC-055 RAH -061 RRH-081 RAH -093 R R H-097 RAH -121 RRH-129 RRH-133 RRH-135 RRH-145 RRH-1046 RAH -1048 RRH-1049 R6 R15 R18 R17 RR W-019 R R W -020 RTL -052 TI, RSW-034 RSW-035 RTO-034 AWL -015 Rider www.americanradiohistory.com 5 R11 R8 R7 R12 R4 R2 R16 R14 R13 R R M-001 ) R1 R9 R3, S2 S1A, B T3 LOUDSPEAKER RESISTOR --.5 meg., volume control w., carbon RESISTOR -3300 ohms, RESISTOR --22,000 ohms, H w., carbon RESISTOR -68,000 ohms, H w., carbon RESISTOR -100,000 ohms, (-á w., carbon RESISTOR --1 meg., H w., carbon RESISTOR -2.2 meg., '3 w., carbon RESISTOR -3.3 meg., H w., carbon RESISTOR -3.9 meg., H w., carbon RESISTOR --10 meg., H w., carbon RESISTOR -750 ohms, H w., carbon RESISTOR -910 ohms, H w., carbon RESISTOR --1000 ohms, k) w., carbon RESISTOR- 33 ohms, 3 w., carbon RESISTOR -1200 ohms, w.w. RESISTOR -1320 ohms, w.w. SWITCH--AC-DC battery switch SWITCH --Power switch 3 TRANSFORMER -I-F transformer TRANSFORMER-Output transformer CORD -Power cord PAGE 17-24 GE GENERAL ELECTRIC CO. MODEL G13-400 IA7G ANT. IN5G IN5G C-8 410MMF./ t .01 ----i- MFG. IOO MMF. O GND. .01 MFO. 02 MAD - 3-30 C-3 50 ! MMF. >AME C-1 3-30 410 I MEG.1L 100 yMF R-9 67,00011 MMF 011 C> MEO.li ! MEG,1L PADDER D-10 tt 820 = R-3 1 MFD. c-9 JC-4 R-4 500 MAW T004 R-7 100 MMF. 100,000 R-1 M 2 MEG. 1L R-8 01MFD R -S L_ C-5 10 MEG1L R-6 Alignment Frequencies IF -455 kc. Broadcast -1500 kc. and 600 kc. NOTE-Do not rest the chassis on any of its sides r{8 FILAMENTS t MFD. h. when attempting to align; place in either an inverted or upright position. IIIIIIIIIII 90K.ß" 1.5K"A" BATTERY BATTERY IF Alignment To align the IF, it will be necessary to remove the chassis from the cabinet. Connect an output meter across the voice coil. Set the volume control for maximum. Adjust the test oscillator to 455 kc. and apply the signal to the control grid of the 1A7G tube through a .05 mfd. capacitor. Do not remove the grid lead from the 1A7G tube. Keep the test oscillator output as low as possible to give a readable output. Adjust all four IF trimmers for maximum output. RF Alignment The following alignment should be made with the receiver fastened in the case. Turn the receiver to its inverted position and make trimmer and padder alignments through the holes provided in the bottom of the case. Connect the ground lead of the signal generator to the receiver chassis and the other lead to the receiver antenna terminal (located underneath cabinet). A dummy antenna consisting of a 250 mmf. capacitor in series with 200 ohms should be connected in the antenna lead of the signal generator. Apply a 600 kc. modulated signal and adjust the oscillator padder for a maximum output while rocking the gang condenser in vicinity of 600 kc. mark on the dial. Using the same dummy antenna with a 1500 kc. signal generator input, adjust the oscillator trimmer for a maximum output. Now remove signal generator leads, tune in a station at approximately the 1500 kc. point on dial and then peak the RF trimmer for a maximum signal. SERVICE DATA Physical Specifications GB -400 9% inches 13 inches Model Height Width Depth 8% inches Tuning Control Drive Ratio Batteries Required -1% -volt "A" battery (Eveready No. 2 -45 -volt "B" batteries (Eveready No. 1 lent). lent). 0 Tuning Frequency Range IF 1.1 741 or equiva- 762 or equiva- 540-1600 kc. Alignment Frequency IF RF 455 kc. 600 and 1500 kc. Loud-speaker-Permanent Magnet Over-all diameter Cone Coil Impedance (400 cycles) Tuning Condenser e Dsn. Tedder Fig. ©John F. 1. Rider Trimmer Location lJ:1«1 One. MF Trimmers 5 inch 3 0 ohms Tubes Converter and Oscillator IF Amplifier Detector and 1st Audio Power Amplifier GE-1A7G GE-1N5G GE-1H5G GE-1C5G For parts list see page 17-25 www.americanradiohistory.com GE PAGE 17-25 MODEL LB -673 GENERAL ELECTRIC CO. necessary to use two "A" batteries and two "B" batteries in each receiver. To connect the batteries to the receiver, open the back and place the batteries in the proper position, as shown on the label, which is inside of the cabinet. Insert battery plugs firmly into their respective battery sockets. ANTENNA This receiver is equipped with a removable Interceptor Beam -a -Scope that has a flexible cable attached. This permits the Beam -a -Scope to be removed from the back of the cabinet and placed at a remote point, such as the window of an automobile or train, etc. The flexible cable is to extend through the opening in the top of the back cover. Two suction cups are attached to the hinges of the Beam -a-Scope which permit suitable temporary fastening to the window. The Beam -a-Scope may be set at the desired angle giving best reception. When the Beam -a -Scope is inserted into the cabinet, the two slide rails permit it to be placed on the back, and the cable of the Beam -a Scope may be wrapped around the two suction cups. LINE CORD POSITION: A small box between the batteries houses the line cord. SERVICE INFORMATION Voltages -Line 117 Volts AC and DC. Power Consumption Watts. Plate (3) 1N5GT R.F. tube to common ground 90 volts Screen (4) of 1N5GT R.F. tube to common ground .._ 90 volta Plate (3) of 1A7GT Converter tube to common ground ..- 90 volts Oscillator Plate (6) of 1A7GT Converter tube to corn gnd 90 v. Screen (4) of 1A7GT Converter tube to common ground 60 volts Plate (3) of 1N5GT LF. tube to common ground 90 volte Screen (4) of 1N5GT I.F. tube to common ground 90 volta Plate (3) of 1H5GT Detector & 1st Audio Tube (approx.) 25 v. Plate (3) of 3Q5GT Power A.F. Tube 90 volts Screen (4) of 3Q5GT Power A.F. Tube 90 volts Cathode (8) of 35Z5GT Rectifier Tube 120 volts Heater (2) & (7) of 1N5GT R. F. Tube 1.35-1.4 volte DC Heater (2) & (7) of 1A7GT Converter Tube 1.35-1..4 volts DC 1.35-1.4 volts DC Heater (2) & (7) of 1N5GT I. F. Tube Heater (2) & (7) of 1H5GT Det. & 1st Aud. 1.35-1.4 volts DC Heater (7) & (8) of 3Q5GT Power A. F. Tube 1.35-1.4 volts DC Heater (8) & (2) of 3Q5GT Power A. F. Tube 1.35-1.4 volts DC Heater (2) & (7) of 35Z5GT Rectifier Tube 36-42 volts AC 20 TYPE BATTERIES - The "A" battery recommended is the Eveready Type No. 746 or equivalent, and the type "B" battery recommended is the Eveready No. 482 or equivalent. It is MODEL LB-673 REPLACEMENT PARTS LIST G. E. Part Number G. E Part Number Description Part Name Antenna Choke 1st I. F. Transformer Transformer 2nd I. F. Transformer Transformer Beam -a -Scope Loop Antenna ' RQ-1300-W Coil RL -390-W RT -3038-W RT-3039-W RL -5006-W R L -2084-W RL -175-W RC -7078-W RC -5213-W Coil Coil Oscillator.. Condenser Condenser Tuning (3 gang) Interstage Condenser Condenser Condenser Condenser Condenser Cond Cond Cond Condenser RC -009' *RC -011 ' RC-072 'RC -146-W * RC -092 *RC -I93 ' RC -136 *RC -235 RC -259 RV -15I -W 'RQ-1263 'RQ-1253 "RQ-1314 Resistor Resistor Resistor *RQ-1331 RQ- I 343 *RQ-1355 * RQ-1303 .... _ .............._..........-........_. R. F. Coil *R9-1259 RR -368-W RR -369-W RC-8249-W RC-8250-W RD -789-W RS -1097-W RT-4034-W RC -9058-W Comb. Electrolytic 404-20 Mfd. 150V Tubular .001 mfd. 400V Tubular .002 mfd. 400V Tubular .05 mfd. 200V Tubular .25 mfd. I00V Tubular .05 mfd. 400V Tubular .008 mfd. 400V Tubular .25 mfd. 200V Mica 100 mmfd. Mica 250 mmfd. Volume Control & Switch W. (Pkg.5) Carbon 1500 Ohm W. (Pkg.5) _ Ohm " 560 W. Pkg.5) ." 200M Ohm RS -238 R4-114 * RS -3084-W RK -1076-W RK- 1077-W RP -1037-W // / Description Part Name / / // W. (Pkg.5) ... Meg. Ohm I/4 W. (Pkg.5) W. (Pkg.5) " 3 Meg. Ohm W. (Pkg.5) " 10 Meg. Ohm (Pkg.5) W. " 68,000 Ohm " 1,000 Ohm 1,6 W. (Pkg.5) Wire Wound-2100 Ohm ....-._ Wire Wound-70 Ohm ......_....__ Resistor Line Cord Battery Cable 50M Ohm " Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor " Cord Cable Speaker Tube Socket Suction Cups Switch Knob Knob Pointer I Glass Dial Scale 5" P.M. with Output Trans Output Transformer for Speaker.. .......... Speaker Cone ._ .._ 5/16" 8 Prong Octal For Beam -a -Scope (Pkge 2). _ Battery -electric switch Indicator Knob (with dot) Tuning Knob Dial Pointer ......... 1 *Used on previous receivers. REPLACEMENT PARTS LIST MODEL GB-400 Description Stock No. Description Stock No. RESISTOR -67,000 ohm, %-w. carbon (R-2) (Pkg. 5) RESISTOR -100,000 ohm, ) -w. carbon ' RC -039 RQ-1303 BOARD-Ant.-Gnd. terminal board CAPACITOR -.004 mfd. 600 V. paper RQ-1307 (C-9) CAPACITOR -.01 mfd. 600 V. paper 'RC -048 CAPACITOR -.02 mfd. 600 ' RC -216 paper 'RQ-1331 RESISTOR -200,000 ohm, %-w. carbon (R-1) (Pkg. 5) RESISTOR -1.0 megohm, %-w. carbon CAPACITOR -50 mmf., mica (C-2).... RQ-1339 CAPACITOR -100 mmf., mica (C-7) .. CAPACITOR -Dual 100 mmf., mica 'RQ-1343 RESISTOR -2.2 megohm, %-w. carbon (R-7) (Pkg. 5) .. RESISTOR -3.0 megohm, 3-w. carbon RB -1001W "RC -018 'RC -235 RC -237 \V ' RQ-1315 (C-3, 5, 8) (C-1) V. . (C-4) . RQ-1355 CONDENSER -Tuning condenser ' CAPACITOR -8 mfd. 150 V. dry elecRS -197W trolytic (C-6) RS -198W RC -6504W CAPACITOR -Oscillator padding caRS -200 pacitor. RC -6505W CAPACITOR -Dual osc. & RF trimmer RS -223 RC -8110W CABLE -Battery cable and plugs RS -241 W RC -9002W CONE -Speaker cone. RS -1003W RD -096W SCALE -Dial scale RT -299W scale.. -Volume RD -097W SCALE RT -300W COIL -Antenna -RF coil (loop) RL -076W RC -738W RC -5118 RL -280W 'RQ-1257 * COIL -Oscillator coil RESISTOR -820 ohm, (R-8) (Pkg. 5) %-w. carbon RT -455W RV -059W Used on previous production receivers. ©John F. Rider www.americanradiohistory.com (R-4) (Pkg. 5) (R-9) (Pkg. 5) (R-3) (Pkg. 5) .. . RESISTOR -10 megohm, %-w. carbon (R-6) (Pkg. 5) SHIELD -1N5 tube shield SHIELD -1A7 tube shield SOCKET -Octal base tube socket (Pkg. 5) SOCKET -1H5 tube socket (Pkg. 5) SOCKET -Speaker socket SPEAKER -5 -inch P.M. speaker TRANSFORMER -1st IF transformer TRANSFORMER -2nd IF transformer TRANSFORMER -Output transformer VOLUME CONTROL -1.0 megohm volume control (R-5) PAGE 17-26 GE GENERAL ELECTRIC CO. MODEL LB -673 1iº°° °°E+ 1!1I! ,CVe},..Op óA m._ u v ,OÑ Jq Ue K. .1MF. al ~ tiQ W ' váó °Uß¡ c> tih 0 O .a > hik di ,O jï3°bá ,,,Z..9 o E., U úY °a, Uÿ p:rá ki a>qacaa' . °c + áq W a> AdDy m Heáp F, er ti c á, u R o )57.() a E+ a'. ÿ F. a CCiZti ó caaxE o x U a> C%] 00 N--. ÿ 03 md aadibo°0.a>i o Pa N W ° Ni b0 m, d C. i10,.a m os ór, z F0.. .E+,1F x ÿ+» uÚ gO Ñ U b00 E a>b - Fi+, y i. C i, O cQ mÄ m 0. p m m ti Á,g >~ y m T. >.,>ÿ W Uo:tÿfz,ea`ai aÚN%e .- ., aj ti' uQ o N _f..Y ÿc o`~ÿ ° ey y á°i . ti p-- v,+ -d ÿ-~.ÿ.a Q < ; k,.^. g á °pU >Ú xo y á dU d WCS ac7F ,q 3 3p ÿ .0 _ á Zii)--; coi%-,p, as ó.: aa ÿ+>óó°°vla> e 'm; a ,, of Q ció óo aó ya V ,.a ro ac i.,-° 4-Vi OyQ O+' Oy- c.3 R m a6 'ChGccqo2, to a> hpÿ,-, .0 m m aK>ybo O m T.i Oo` m .4--VVVVVVV 2 cd +áa HC0 O > euw G4 ana oa Ua>x.> ..3e-19"...)-..);"')-9-4) -i->-al p cd." .04 G. méóß' Q,Nv r.a m ' reOaa 13m N p °r> a> y aO' P.- 3. O.,.bpy°yai.a II6aWl a> p a> LOE . ó>.47m a0a O V V cf) t do 9 o T. q u >, a) i0 +ae>.mF.a 4).-°i .L NVVV\/VV u,.°aL. +' a aa.-i3 u ái as :4 + ' o: O CC a3 a> as ° ó'ú j F,,,aa°a3 ca q ri. ~. Vÿ,.°>,.ay'C)RF, a>m bpo O rd o.mra aO,-o'mw t cOicap ROER U . Q00000000 JII f (3O0000000 ®® i y I aia) a>ogm aa .. Cr) p+f°,E- x -m m3 t-- , lli O 8.00 G1 Oq m P0>u2wa>p w Q a u ° ai°ÿ 60 'ceawávj. a>ao I I ,NV~ \.900000000 a) pCo3 UNO) WA I o I aa W mom >. u ;%--1:-13:0:,....2; 0_ °> . á`-Q' a :<:19 a: ,°óW O Ñ 7r-iÿ m' c.á G >ÿ .0 2> O H áO3ó+°a» i.Ú> o> ÿw,O a>.0 A bp W°°'d N fyj...O., O) a> CC O 03 r.,, p,w cl o> .a ÿ ^3a 71e. Coó a! p>u -IC' ____(COOOpppp .ñc.m°ioc`a.a>a> 1 (Die 9. M pc ñmuc) ó'ñ>CG R(.p, Opp For parts list I and www.americanradiohistory.com service notes see page 17-25 d eichenigaür \\ GE PAGE 17-31 MODEL 417A GENERAL ELECTRIC CO. oI O WÓ + aoeao Ow a `º 1. m K HII K HIP -1K,L-- .... .... N U co H HI r- v N U .9 HI' U a a0 N U > H7/1,HN m iTt Ñ + O cr, -IHI K rl e17H >(n_ e- M i 1r -m LHIP r 171711 qo m a 1lV cc HII N IHI LCI CC J_ TV OC N á Ir u w m N J -yv . . J m . Ñ ¢ J.--'4(115 .21 CC .n Ñ N °` m r ,c)Ha V J ÑiioD`--b J o- 4_ _t- ©John F. Rider www.americanradiohistory.com U m I. PAGE 17-32 GE :MODEL 417A GENERAL ELECTRIC CO. ALIGNMENT EQUPMENT REQUIRED. %-watt resistor. (See steps 16 to 21.) mmf. mica capacitor. (See steps 22 to 28.) Important detailed instructions and references in connection with the alignment table which follows are keyed in by means of column 7, headed "See Note." The notes are included in numerical order after the table. They are important -refer to them carefully. 6. 400 -ohm, 1. Test 2. D -C Oscillator with tone modulation. (See Table.) Voltmeter or Microammeter. (See notes 2 and 3.) 3. A -C Voltmeter, 2 volts. (See note 6.) 4. Insulated hex wrench, 3 '. (See steps 1, 10, 13.) 5. .01 MF Paper Capacitor. (See steps 1 to 5.) 7. 200 ALIGNMENT TABLE Step Signal Signal Generator Frequency Band Switch Input Point Dial Setting See Adjust Remarks Note FM IF ALIGNMENT 1 2 10.7 mc 6SH7 grid thru .01 mf FM1 See last column 6SH7 grid thru .01 mf FM1 3 As in step 4 10.7 mc C49 for zero** 1, 2 Adjust C49 for zero meter reading. Apply 1 -volt signal input. Signal 1, 2 Detune signal generator to point of maximum meter reading. Peak C48 1, 2 Generator 2 6SG7 grid thru .01 mf FMI 6SV7 grid thru .01 mf FM1 Peak C28 & 1, 3 6AQ7GT tube removed from its socket. Peak C26 & 1, 3 6AQ7GT tube removed from its socket. & 1,3,4 6AQ7GT tube removed from its C94 10.7 mc 5 6SG7 grid thru .01 mf FM1 C93 10.7 mc Cony. grid directly FM1 Peak C24 L-10 socket. AM IF ALIGNMENT Cony. grid directly 455 kc 7 STD Peak C86 & 5, 6 Peak C15 & 5, 6 Peak C13 & 5, 6 C61 455 kc 8 Cony. grid directly STD C23 455 kc 9 Cony. grid directly STD C14 FM RF ALIGNMENT DIPOLE terminals 88 mc 10 FM2 88 mc -6.8 to 6.9 in.* Peak C6** Peak C3 7, 10 11 98 mc DIPOLE terminals FM2 For max. output 12 98 mc DIPOLE terminals FM2 Do not change Peak C2 13 43 mc DIPOLE terminals FMI 43 mc 6.1 in.* Peak C45** For max. output Peak C63 DIPOLE terminals 46 mc 14 DIPOLE terminals 46 mc 15 FMI FM1 -6 to 1, 3, 1, 3, 8 Set dial accurately-then adjust C6. Tune dial for maximum output, then peak C3 while rocking dial. 1, 3 1, 3, Set dial accurately-then adjust C45. 7 1, 3, 8 Do not change Peak C65 Tune dial for maximum output, then peak C63 while rocking dial. 1, 3 SW RF ALIGNMENT 16 17 11.8 mc Antenna thru 400 SW2 11.8 mc -4.5 to 4.6 in.* 11.8 mc Antenna thru 400 SW2 Do not change Peak C57 ohms ohms 11.8 mc 18 19 20 21 9.6 mc 9.6 mc 9.6 mc Antenna thru 400 ohms SW2 Do not change Peak C54 Set dial 5, 6, Peak C57 while rocking dial. 5, 6 SW1 9.6 mc -4.5 to 4.6 in.* Antenna thru 400 SW1 Antenna thru 400 SW1 ohms ohms Peak C59 F. accurately-then adjust C59. 5, 6, 7, 10 Set dial Do not change Peak C56 5, 6, 8 Peak C56 while rocking dial. Do not change Peak C55 5, 6 7. )**Use insulated hex wrench, W. ©John C54 is located on back apron of chassis. Antenna thru 400 Important! See Note accurately-then adjust C58. 5, 6, 7, 10 8 ohms * Peak C58 Rider www.americanradiohistory.com GE PAGE 17-33 MODEL 417A GENERAL ELECTRIC CO. ALIGNMENT TABLE (Cont'd) Signal Signal Input Point Band Switch Step Generator Frequency 22 1620 kc Antenna via 200 mmf STD 23 1620 kc Antenna via 200 mmf STD 24 1620 kc Antenna via 200 mmf STD 25 1500 kc Antenna via 200 mmf STD 26 1000 kc Antenna via 200 mmf STD 27 1000 kc Antenna via 200 mmf STD Dial Setting See Adjust Remarks Note BROADCAST RF ALIGNMENT 28 580 kc Antenna via 200 mmf STD Extreme right- Peak C5 hand position Extreme right- Peak C4 hand position Extreme right- Peak Cl hand position 1500 kc-1.4 5, 6 5, 6 5, 6 Osc. Coil T3 to 1.5 in.* For max. output iron slug Cony. coil T6 iron slug Do .not change R-F coil Ti iron slug For max. out- Peak L8 T3 iron slug is the rear one on the left side. Adjust for peak. T6 iron slug is the center one on the left side. Adjust for peak. T1 iron slug is the front one on the left side. Adjust for peak. Peak L8 while rocking dial. 5, 6, 7, 9 5, 6, 9 5, 6, 9 5, 6, 8 put Repeat steps 29 * Important? See Note 2. 3. 4. 5. 6. Use unmodulated signal. Connect 20,000 -ohm -per -volt meter frcm junction of R21 and C29 to chassis. Use ten -volt scale. (Steps 1-3.) Connect 20,000 -ohm -per -volt meter from grid pin 4 of 6SH7 to chassis with a 200,000 -ohm resistor in series. The resistor must be connected directly to the grid so that capacity loading will be negligible and so that the meter is isolated from the i -f signal voltage. Keep signal generator output down so that the meter indicates not more than one volt at the grid (5 micro -amperes through 200,000 ohms). (Alignment steps 4 to 6, 10, to 15). Connect signal generator directly to the converter grid at some convenient point. The generator lead must be shielded up to this connection so that not more than Tle inch of exposed lead exists. Ground the shield solidly by clamping it firmly to the chassis or a shield as close to the connection as possible. (Steps 6-9 ) Use 400 -cycle modulation. (Steps 7 to 9, 16 to 28.) Connect a standard output meter across speaker voice coil. Turn volume control fully on. Keep signal gener- to 9, 16 to 28.) If dial scale is not available, index pointer as follows: Turn pointer to right-hand limit of travel. Mark the dial back plate at a reference edge of the pointer slider. Then set pointer by turning dial knob until the indicated dimension exists ,between the reference edge and the 7 7. mark. "Rocking" consists of adjusting the indicated adjuster while turning the dial a small amount back and forth through peak output. The object is to find the maximum peak. Rocking is necessary and is permissible only when interlocking circuits are being adjusted. 9. The main tuning iron slugs are suspended from the left side of the tuning "elevator." They are individually adjustable by loosening the locknut and turning the supporting screw into which the suspending wire is soldered. 10. Two oscillator settings will give response. The higher frequency response point is the correct one; the other is the image. If in doubt, start with the trimmer screw loosened completely and adjust for the first response. 8. LOCATED APRON OF ON C54 BACK ,=, CHASSIS 11BML C26 a G93 6L7 MC C23B GIS 013 e C14 45566 7 4556G c45 O4]MC c61 B C24 107MG C86 4556C c4e 10 71/C. CS0Q y 1e 62 6C O965MC G6 BBMC C C49 LID 010.7 MC 0SBO6C 10 714C e C4 16206c0 C57 G56 96MC . 0 Cl ® 9eML C63 IIBMC 46 MC CSS 9 661 e206G® 16CI ur0 STD rat 09eML BAND SWITCH POSITIONS 065 46MC u VOLUME u u BASS BAND SwrTCH Figure ©John F. to 28. ator output down sa that the meter indicates not more than 2 -watt output (2 volts) during alignment. (Steps Notes in Connection with Alignment Table 1. 22 7. 7-Location of Tubes and Acquitters Rider www.americanradiohistory.com TUNING PAGE 17-34 GE GENERAL ELECTRIC CO. MODEL 417A WIRING OF BAND SWITCH SECTION 4 (Wire length given from end to end before stripping) -connected At this SECTION - At this lug - connect lug 1 - -the other end of which is connected to this this- 1 -connect a. b. 2 5 Insulated wire, S54" Insulated wire, 7%" 1g. 1g. Antenna transformer T13, terminal Push-button socket, terminal F Insulated wire, 254" 1g. Trimmer C4, lug nearer T6 See Section 3, lug Antenna terminal at rear of chassis Switch Section 1, lug 6 Switch Section 2, lug 1 4 See Switch Section 2, lug 5s Short bare bus 6 Capacitor C88 Tuner T5, left-hand terminals 7 Short bare bus Tuner TS, left-hand terminal Capacitor C11 Tube socket V2, pin Capacitor C52 Antenna transformer TI, terminal Beam -a -scope plug, terminal A Antenna transformer T13, terminal Short bare bus b. Resistor R15 Ground lug on C65 Switch Section 1, lug a. Insulated wire, 11" ig. Terminal strip Capacitor C31 Front terminal of T2 Insulated wire, 9" lg. b. Insulated wire, 7" lg. See 1 2 8 11 lug 513, 1, lug 4 Short bus with spaghetti Coil L7, terminal 2 (toward front) Short jumper Switch Section 4, lug 4 (adjacent) Section 5, lug 12 Trimmer C57, front terminal Bua with spaghetti, 254" lg. Coil L7, terminal a. 12 above -connect this a. lug - - -the other end - 2yr b. See Section 1, lug 3 connect this a. of which is connected to this b. a. b. Section 1, lug 2c Insulated wire, lg. Trimmer CI, lug nearer Tl 4 Insulated wire, 154" Ig. Trimmer C55, lug nearer T1 - end of which is connected to this Bus with spaghetti, 1iesistor g. R33 1 1 lb See Bus with spaghetti, 3' Ig. Coil Ll, terminal 2 Bus with spaghetti, 3' lg. Capacitor C45, left-hand terminals b. Bus with spaghetti, 154 Section 5, lug 10 a. Coil L20 Ground lug on trimmer C2 Short bare bus Trimmer C65, left-hand terminals Ics Short bare bus 7 Short bare bus Trimmer C2, left-hand terminals 8 Capacitor C12 8 Capacitor C7 Tube socket VI, pin 9 Insulated wire, 4' 1g. 9 Insulated wire, 4' 1g. Antenna transformer T13, terminal I See Section 5, 613 Insulated wire, 354" lg. Antenna transformer T1, terminal Insulated wire, 1134" lg. 1 4 Section 6, lug 4 S 5 11 terminal Coil L8, terminal 4 6 Li, Coil Section 5, lug Insulated wire, 3" if Insulated wire, 1 j4 lg Section 5, lug - -the other 6 10 1 SECTION 5 2 See 1 Capacitor C73 Insulated wire, 254" Ig. 10 At this lug- Trimmer C63, lug nearer front Section 5, lug 11 Trimmer C56, front terminal a. b. SECTION 2 At this lug 3c, directly above Capacitor C72 b. Insulated wire, 254" ig. 9 Terminal strip 2, lug 5 Filter capacitor, C46C a. 11 3 lug 2b, above See 8 4 3 Insulated wire, 15j" 1g. b. Insulated wire, 14" 1g. c. Insulated wire, 554" lg. a. 7 3 l 1 Insulated wire, 11W Ig. b. Insulated wire, f" lg. c. Capacitor CSO a. 6 9 is Antenna transformer T13, terminal 3 4 to this Insulated wire, 5" lg. 1 2 a. b. c. - -the other end of which this- 1g. 1 Beam -a -scope plug, terminal C 10 a. b. Capacitor C41 Tuner T4, left-hand terminal* Tube socket V3, pin lug Section 6, lug 2 1 Trimmer C5, lug nearer T3 6 Insulated wire, 35-j" 1g. b. See Section 4, lug 9a Trimmer C59, lug nearer front Insulated wire, 354" Ig. Trimmer C58, lug nearer front 11 a. 12 a. b. See Section 4, lug 10a SECTION 3 At this -connect lug- SECTION 6 - -the other end of which is this- connected to this 1 Shielded wire, 8e/j" lg. Terminal strip 2 Insulated wire, 1.4" lg. Switch Section 3, lug Insulated wire, 254" 1g. b. Capacitor C16 2, At this 4 Insulated wire, 754" Ig. Terminal strip 5 Insulated wire, Converter coil T6, terminal 6 Short bus with spaghetti Chamois 7 Short bare bus Terminal strip 3, lug Shielded wire, 1054" lg. Terminal strip c. 10 1 554" 1g. See lug 3c, above b. Capacitor CIO 11 a. 12 a. See lug 2, above b. Shielded wire, 7%' lg. 2, 1 Insulated wire, 454" lg. I -F transformer T7, terminal Bus with spaghetti, 134" Coil L1, terminal lug 3 Ig. F. u See 5 Insulated wire, 12" lg. 6 2 8 2 Section 5, lug 2b 4 Push-button socket, terminal A Bus with spaghetti, 2".1g. Trimmer C45, center terminal b. Capacitor C75 Ground at C59 c. See Section 5, lug 10b a. 4 7 Short bare bus 2, lug 2 8 Bare bus, 9 Insulated wire, 2W 1g. I -F transformer T7, terminal S 10 Insulated wire, 2%' lg. I -F transformer T7, terminal 3 12 Insulated wire, 334" lg. Coil 1.8, terminal Switch Section 4, lug 3 Push-button socket, terminal B * Looking from front, chassis inverted. * Double lug (front and rear) soldered together. ©John end of which connected to this 2 12 Choke L3 a. - -the other lug 6 Converter coil T6, terminal 1 Ground lug on terminal strip 3 Switch Section 3, lug 11 3 -connect this- lug- Rider www.americanradiohistory.com I" lg. Trimmer C6, center terminal Tube socket V3, pin 3 7 GE PAGE 17-35 GENERAL ELECTRIC CO. GRID MODEL 417A GRID GRID PLATE GRID ANT TAP LOOP PRI DOTTED CIRCLES ARE DUMMY TERMINALS FM GRID DIODE PILOT HOLE GRID 4M -ID PLATE HOLE B. 6SV7 AM 6SH7 B+ AUDIO CATHODE 640761 FM PILOT HOLE PILOT HOLE PLATE 6SG7 PLATE CONV AUDIO DIODE Br GRID PLATE 6SV7 6SV7 DIODE 13) I 6A07GT 6A07GT BOTTOM VIEW OF COILS LOOKING FROM FRONT OF CHASSIS 3-Terminal Identification of Coil Assemblies Figure (Numbers correspond with schematic) SOCKET FOR LOOP OR ANT. TRACKING COIL 5-Identification of Switch Figure -Set TERMINAL STRIP NO.I I 2 4 Lugs Inverted and Viewed from Panel 4 TERMINAL STRIP NO,.22 PILOT HOLE TUBE COMPLEMENT: 2 Converter Oscillator 1st I -F Amplifier.. 5 PUSH-BUTTON SOCKET e TERM NAL STRIP NO.3 CII 2nd I -F Amplifier . . ....... 6SG7 6SV7 . FM Limiter-AM Detector Discriminator -1st A -F Amplifier 7 Power Amplifier Phono Pre -Amplifier.. Rectifier Dial Lamp (2) 5 °co .. 6AG5 6AK5 6AK5 R -F Amplifier .. 3 B ..6SH7 ............. 6AQ7-GT 6V6GT 6SC7 5Y3GT GE No. 44 GE No. 47 . Pilot Lamp (bottom of cabinet). . . SWITCH WAFER Figure 4-Physical Location of Components Listed in Band Switch Wiring Table VIO -6S67 V4-6SG7 8 Io 1 I \ CATHODE PLATE+9O SCREEN +125 V6-6SH7 PLATE + 216 30/ p / PLATE V5-6SV7 +23 PLATE +239 + 70 6.3 A.C. 3.1 A C. - SCREEN+57 (F.M. BAND ONLY) 6.3 A.C. PLATE +114 3.I A.C. THIS TUBE ON V3-6AK5 PRE -AMP CHASSIS BOTTOM VIEW OF CHASSIS SHOWN PLATE +140 V9- 5Y3GT O 07 6 O +140 6.3 A.G. 8 IO I O O +310 ALL VOLTAGES MEASURED TO CHASSIS USING A 20,000 OHM PER VOLT METER SCREEN V7-6AQ7GT 1.3 A. i0 C. V2 -6AK5 PLATE +78 7 Figure 8-Socket Voltage Diagram PLATE +168 V8-6V6GT 6.3 A.C. VI - 6AG 5 SCREEN SCREEN +247 +87 PLATE +29 PLATE +142 6.3 ©John F. 30 \ 40 6 5 o REEN C8 B` 7 A.C. Rider www.americanradiohistory.com CAT 14ODE+13 6.3 A.C. PAGE 17-36 GE MODEL GENERAL ELECTRIC CO. 417A GENERAL INFORMATION INTRODUCTION The information contained in this service note covers the Model 417A completely except for the record player. THE TUNING SYSTEM The "r -f end" of the receiver is unusual in a number of respects. Variable inductance tuning is employed instead of using a conventional tuning capacitor. This design makes possible two distinct advantages. First, it provides a high efficiency FM circuit in the 88 to 108 megacycle range which would not be possible with the more conventional methods of tuning. Second, it provides stable short-wave spread -bands which tune as easily as the broadcast band. Other advantages are also obtained but the two mentioned above are the most important. Tuning is accomplished by an "elevator" which consists of a rigid plastic horizontal plate raised and lowered by means of a windlass controlled by the tuning knob at the panel. From this plate are suspended three powdered iron cores which tune the broadcast r -f, converter, and oscillator coils; and three tuning "vanes" which tune three low -inductance circuits. These latter circuits are employed in both FM bands and both short-wave bands with the exception of the antenna circuit for the short-wave spread -bands when a broad tuned antenna coil is used and the r -f guillotine tuner is switched out. They are called "guillotine" tuners because of their appearance. FACTS ABOUT "GUILLOTINE" TUNING The "guillotine" tuners are designed primarily for the 88-108 megacycle FM band where special technique is needed to realize high gain and circuit stability. Ordinary coils, tuned by a variable capacitor, are inefficient at these frequencies, first, because of the low inductances required to reach these frequencies when a variable tuning capacitor is employed and, second, because shunt capacity reduces the gain of the amplifier circuit; shunt capacity must be kept very low. Another disadvantage of standard tuning arrangements at these frequencies is that common coupling is obtained through the shaft of a ganged tuning capacitor unless insulated single sections are used (cumbersome and costly). Common coupling of this type tends to cause oscillation or general instability and precludes high gain per stage. The guillotines make possible short leads, completely isolated sections, stable tuning, high Q circuits, low shunt capacity, and location of each tuner in the best physical and electrical position in the assembly. Furthermore, since the shunt capacity is small and the inductance is consequently at its highest corresponding value, the additional unavoidable inductance introduced in the wiring, band switch, etc., produces a minimum of circuit losses and unbalance. The guillotine tuner consists of a heavy, silver-plated, two turn square coil, rigidly supported between two plastic posts. A flat, solid vane slides up and down between the two turns. It is guided in grooves in the plastic posts so that it passes between the two sections of the Coil without touching them. The posts are so moulded and the coil so constructed that the whole assembly is held rigidly at a predetermined spacing. The tuning vane is raised and lowered by the tuning elevator. When the elevator is all the way up (set tuned to lowest frequency), the vane is completely above the coil which then acts as a simple two -turn coil. As the set is tuned toward the higher frequencies, the vane moves downward into the field of the coil until, finally, it is all the way in. The vane reduces the inductance of the coil through two principles. First, it acts as a shorted turn, and thus reduces inductance directly; second, it provides a barrier between the two turns of the coil which reduces the mutual coupling and thus also reduces inductance. The tuners described above are identified as T2, T4, and T5, on the schematic diagram. tuning. The "C" part of the tuned circuit consists primarily of a shunt trimmer. Switching from one short-wave band to the other is accomplished by selecting a different shunt trimmer. The converter grid circuit, as an example, includes L7 and T5 in series in both the SW1 and SW2 bands. Tuner T5 is in the ground end of the circuit and the signal is fed into the grid and through C10. The shunt tuning capacity is either C56 or C57, depending upon which of the two short-wave bands is used. Additional oscillator coupling capacitors, C72 or C73, are also added to compensate for the lower coupling through C67 when the higher shunt capacitors are 'in the circuit. In the r -f stage, a section of the loop is used as the grid circuit. It is tuned for resonance by a shunt capacitor (C54 and C55) and a shunt inductance (L20). Beciuse a tuned circuit of this type is inherently broad, tuning through the relatively narrow spread -band offers little advantage and is not done. STANDARD BROADCAST BAND When manual tuning is employed (Band Switch in STD position), the receiver employs an r -f stage, a converter, and an oscillator, all of which are tuned by iron slugs suspended from the tuning elevator. In the automatic position (Band Switch in the AUTO position), the r -f stage is not used. Instead, a separate antenna coil is used which couples the antenna and loop directly into the converter. A separate coil is used in order to make the tuning circuit independent of the dial tuning mechanism so that it may be tuned by trimmers in the push-button assembly. Switching from manual to automatic tuning is accomplished in the oscillator by using an oscillator coil which is tuned by a separate shunt inductance. In manual tuning, the inductance is one which is tuned by the tuning elevator. In automatic tuning, a fixed shunt capacity (C-76) plus one of a series of push-button selected coils tunes the oscillator, I-F Stage gain measurements by vacuum tube voltmeter or similar measuring devices may be used to check circuit performance and isolate trouble. The gain values listed may have tolerances of 20'.x. Readings taken with low signal so that AVC is not effective. R-F (1) ( Bandspread tuning in the short-wave bands is obtained in the converter and oscillator circuits by inserting the guillotine tuners in series with a higher inductance so that the two inductances together form the "L" part of the short-wave tuned circuit. The small percentage change in inductance obtained in the tuner provides smooth, wide, and stable F. (2) Audio Gain .07 volts at 400 cps across volume control with control set at maximum will give approximately 2 watt output across the speaker voice coil. SHORT-WAVE SPREAD-BANDS ©John and I -F Stag. Gains Signal applied through IRE dummy antenna: Antenna post to V1 grid 4 (a- 1000 kc Antenna post to VI grid2 (d; 9.6 me Antenna post to V1 grid. 2 (à 11.8 me Signal applied through 300 ohms, including signal generator impedance: Dipole terminals to VI grid 1.5 @ 45 me Dipole terminals to V1 grid 2 @ 98 me These checks with oscillator tube (V3) removed: VI grid to V2 grid 13 1000 kc V1 grid to V2 grid 6 (a 9.6 me V1 grid to V2 grid 9 (à, 11.8 me VI grid to V2 grid 13 (a, 45 me V1 grid to V2 grid 10 @ 98 me These checks with oscillator tube (V3) removed: V2 grid to V4 grid 23 (a 455 kc V2 grid to V4 grid 37 (a, 10.7 me V4 grid to V5 grid 23 (a 455 kc V4 grid to VS grid ... 60 a 10.7 me V5 grid to V6 grid 40 e 455 kc VS grid to V6 grid.. 25 (a 10.7 me FM BANDS Guillotine tuners T2, T5, and T4 are used as the tuned circuits for the r -f amplifier, converter, and local oscillator respectively, in both FM bands. In the higher frequency band, the tuner is used with only a small shunt trimmer for adjusting distributed capacity. In the lower band, a higher value shunt trimmer is used to reduce the frequency. The layout of band switch, tuners, and tube sockets is arranged to give the shortest possible leads when the FM bands are in use. The lead length in the other bands is not nearly so critical. AMPLJFWR The i -f amplifier consists of a composite 455 kc and 10.7 me circuit. The.electrical changes required to transfer between AM and FM service are made by the Band Switch. When the switch is in either the FMI or FM2 position, the amplifier operates at 10.7 megacycles and delivers the i -f signal into an FM discriminator circuit. When the switch is in any of the other positions, the amplifier operates at 455 kc. Screen voltage is removed from the tube which acted as an FM limiter and this tube then acts as an AM diode detector. Thus, the AM audio signal appears across R16 while the FM audio signal appears across R22. A section of the Band Switch switches the audio input circuit from one to the other. The AVC bus is also shorted out for FM. STAGE GAIN AND VOLTAGE CHECKS (3) Oscillator Grid Bias D -c voltage developed across R5 (average): 13 v. (q. 1000 kc 2.7 v. (a 11.8 me 2.7 v. (a 9.6 me 5.5 v. (a 45 me 7 v. (a 98 me (4) Socket Pin Voltages Fig. 8 shows typical tube pin voltages. All readings should be made from the pins to ground unless otherwise indicated. Rider www.americanradiohistory.com GE PAGE 17-37 GENERAL ELECTRIC CO. REPLACEMENT OF DRIVE CORDS DIAL STRINGING: Push the tuning elevator all the way down and string the dial as shown in Figure 1. This illustration shows the stringing as viewed from behind the dial scale, as you would see it when working on it. The numbers and arrows indicate the progression of the dial cord from start to finish. Notice that the dial cord, in progressive steps 9, 10, 11, and 12, is made to travel behind the start and end of cord stringing, as viewed in Figure 1. The procedure will be easier if pulley C is bypassed until the rest of the work is finished after which the cord can be pulled tight over that pulley. During the procedure, locate the two brass eyelets so that they fall between pulleys A and B. When finished, crimp the eyelets on the cord in the proper positions to act as minimum and maximum stops for the tuning mechanism and clip the pointer on the cable half-way between the eyelets. Separate detail drawings are given to show the three different methods of attaching the ends of the cord. The arrangement with the standard helical spring was used in some earlier production receivers. If the cord and spring are to be replaced, the Type 1 spring should be used. It fits the same drum and is an improved type. The Type 2 spring should be used with the later type of drum (with two tabs). When stringing the mechanism with either the Type 1 or Type 2 spring, load the spring by pulling the hook over the projection at the other end of the spring, string the dial and, as á final step, release the hook so that it pull& up the slack in the dial cord. Elevator Stringing The step-by-step procedure for stringing the elevator windlass is shown in Figure 2, a rear view of the mechanism. Start by inserting the metallic cord in slot as shown in Step 1. Observe that the cord is measured five inches from end of loop to where it enters the slot. Now bring the loop end around the pulley counterclockwise, as in Step 2. Next, thread loop through hole in elevator top plate, fastening it to the hoist cord tension spring, as viewed in Step 3. Steps 4, 5, 6, and 7 show how the free end of cord progresses on the pulley, going clockwise and that each turn is laid progressively one in back of the other and in back of the vertical section, going to the tension spring in tuner plate. In Step 6, pass the free end of cord down through the hole in chassis, grasping its Figure ©John F. end with long -nosed pliers and drawing tension on cord while running elevator completely down to the bottom. Keeping tension on cord and forcing large dial drive drum so that hoist cord spring is compressed, complete Step 7 making a one turn loop of the cord's free end around the lug shown on end of elevator shaft and solder. Concluding Comment After replacing the dial cord or the elevator cord, it may be found that some correction in relative positioning is needed. This can be done by loosening the set screws in the large drive pulley directly behind the dial scale and re -positioning it on the shaft. The object, of course, is to permit the tuning control to drive the elevator through its full tuning range. Slight errors in final setting are not serious since leeway is provided in the location of the dial pointer itself. WIRING OF BAND SWITCH In order to facilitate repair, replacement, and circuit tracing, a table and diagrams are supplied with reference to the connections made in the band switch. If used properly, these will be of invaluable aid. The remarks which follow are intended to clarify the make-up of the tables and diagramsread'them carefully before using the table. The table is broken down into six parts, one for each switch wafer. Section 1 is nearest the front and section 6 is the rearmost wafer. Individual lugs on each wafer are numbered from 1 to 12, depending upon their position on the wafer. The method of numbering is illustrated in Figure 5. In determining the number, turn the chassis upside down and look from the front toward the rear of the chassis. Thus, lugs 1 and 12 are the ones which are at the bottom when the set is in its normal position; lugs 3 and 4 are on the side with the broadcast band coils; and lugs 9 and 10 are on the side with the 6AK5 tubes. The numbering refers to lugs whether they be on the front or rear of the wafer. Figure 4 shows the physical location of various components and terminals to which reference is made in the table. In those cases where a component symbol number is given in column two, instead of a wire, that component is connected by its own lead wire directly to the switch lug and the connection of the other end of the component is given in the last column. 1-Dial Stringing Diagram Showing Figure MODEL 417A Later Production Springs 2-Elevator Windlass Stringing Procedure Rider www.americanradiohistory.com PAGE 11-38 MODEL GE 417A GENERAL ELECTRIC CO. REPLACEMENT PARTS LIST Part No. Symbol Part No. Description UNIVERSAL REPLACEMENT !'ARTS motive UNIVERSAL «PLACEMENT PARTS UCC-039 UCC-040 UCC-041 UCC-042 UCC-045 UCG-2048 UCN-506 UCU-020 UCU-028 UCU-048 UCU-520 UCU-528 UCU-536 UCU-1042 UCU-1504 UCU-1512 UCU-1544 UCW-1004 UCW-1014 UCW-1020 UCW-1028 UCW-2022 UIC -001 UJB-014 UJB-0l8 UOP-1230 UOX-002 URD-007 URD-009 URD-017 URD-025 URD-033 URD-041 URD-049 URD-057 URD-061 URD-065 URD-077 URD-083 URD-085 URD-089 VRD-091 URD-093 URD-095 URD-097 URD-099 URD-103 URD-105 URD-113 URD-121 URD-125 URD-129 URD-133 URD-145 URD-1079 URD-1104 URE -035 URE -073 URE -083 URE -085 RAB -021 RAD -016 RAX-007 RAX-008 RCC-001 RCC-035 RCC-040 RCC-041 RCC-056 RCE-029 RCE-030 RCW-001 RCW -013 RCW -014 RCW-015 RCW-017 RCW-060 RCW-1028 RCX-011 RCX-016 RCX-022 RCX-023 RCX-024 RCY-011 OJohn F. C43 C17, 30, 64, 69, 89, 91, 103 C9, 18. 74, 104 C37 C47, 66, 77, 101, 102 C76 C52 C21, 53 Description Symbol CAPACITOR -.005 mfd., 600 v., paper CAPACITOR -.01 mfd., 600 v., paper RCY-017 RDB-001 C6, 45 RDB-004 CAPACITOR -.02 mfd., 600 v., paper CAPACITOR -.03 mfd., 600 v., paper CAPACITOR -.0S mfd., 600 v., paper CAPACITOR -680 mmfd., 500 v., silver mica CAPACITOR -6.8 mmf., ceramic CAPACITOR -47 mml., 500 v., mica CAPACITOR -100 mmf., 500 v., mica C68 CAPACITOR -680 mmf., 500 v., mica C38 CAPACITOR --47 mml., mica C30 C70,79,31 CAPACITOR -100 mmf., 500 v., mica CAPACITOR -220 mmf., 500 v., mica C85 CAPACITOR -390 mmfd., 500 v., mica C29 CAPACITOR -30 mmfd., mica C73 CAPACITOR -22 mmfd., 500 v., mica C72, 90 CAPACITOR -470 mmfd., mica C8 CAPACITOR -10 mmf., ceramic C50 CAPACITOR -27 mmt., ceramic C22 CAPACITOR -47 mmf., ceramic C41 CAPACITOR-100 mmf., ceramic C34 CAPACITOR -56 mmf., ceramic C75 CEMENT -Speaker cone replacement cement TERMINALS -4 lug terminal strip TERMINALS -2 lug terminal strip SPEAKER-12 -in. permanent magnet speaker CONE -Loudspeaker replacement cone assembly R30 RESISTOR -18 ohms, 4 w., carbon R26 RESISTOR -22 ohms, 34 w., carbon RESISTOR -47 ohms, 34 w., carbon R2 RESISTOR -100 ohms, 4 w., carbon R33 RESISTOR -220 ohms, 34 w, carbon R29 RESISTOR -470 ohms, 34 w., carbon R12 RESISTOR -1000 ohms, 34 w., carbon R34 RESISTOR -2200 ohms, 34 w., carbon R38, 46 RESISTOR -3300 ohms, 34 w., carbon R101 RESISTOR -4700 ohms, 34 w., carbon R20, 45 w., carbon RESISTOR -15,000 ohms, 34 RIO RESISTOR -27,000 ohms, 34 w., carbon R104 RESISTOR -33,000 ohms, 34 w., carbon R19, 44 RESISTOR -47,000 ohms, 34 w., carbon R24 RESISTOR -56,000 ohms, 34 w., carbon R7 RESISTOR -68,000 ohms, 4 w., carbon R13, 21 RESISTOR -82,000 ohms, 34 w., carbon R28, 39 R9, 40 RESISTOR-100,000 ohms. 34 w., carbon RESISTOR-120,000 ohms, S4 w., carbon R22, 23 R6 RESISTOR-180,000 ohms, 34-w., carbon R16,27,41 RESISTOR-220,000 ohms, 34 w., carbon RESISTOR -470,000 ohms, 34 w., carbon R32 RESISTOR-1.0 meg., 34 w., carbon R37 RESISTOR-1.5 meg., 34 w., carbon RI, 4, 8 RESISTOR-2.2 meg., 34 w., carbon R14, 18 R47, 102, RESISTOR-3.3 meg., 34 w.. carbon RDC-019 RDC-021 RDE-016 RDG-003 RDK-004 RDK-032 RDO-001 RDP-016 RDP-022 RDS-018 REX -002 RHC-007 RHC-009 RHC-010 RHE-001 RHM-016 RHM-024 RHM-025 RHM-026 RHM-027 RII -001 RJC-001 RJJ-004 RJP-002 RJP-003 R JP -004 RJP-005 RJP-010 RJP-011 R S-003 RJJS-012 RJS-027 RJS-030 R JS -044 RJS-049 RJS-051 RJX-009 RLA-009 RLA-011 RLA-016 RLB-005 RLB-006 RLB-007 RLB-008 RLB-009 103 RESISTOR-10.0 meg., 34 w., carbon R42 RLB-010 RESISTOR -18,000 ohms, 34 w., carbon RLC-013 R5 w., carbon RESISTOR-200,000 ohms, 34 R105 RLC-014 RESISTOR -270 ohms, 1 w., carbon R31 RLC-015 RESISTOR-10.000 ohms, 1 w., carbon R3 RLC-016 w., carbon RESISTOR -27,000 ohms, I R15 RLC-017 RESISTOR -33,000 ohms. 1 w., carbon R17 RLF-003 RLI-002 RLP-004 SPECIALIZED REPLACEMENT PARTS RLP-006 RMC-012 BEAM -A -SCOPE -Cabinet back and loop assem- RMC-013 L17 bly RMC-014 BRACKET -For band switch mounting at front RMM-009 L12, 13, COIL -Pushbutton coils mounted on bracket RMM-010 14, 15. 16 RMM-011 BRACKET -Bracket and roller fork for elevator RMM-015 shaft RMR-002 v., paper CAPACITOR -.007 mfd., 600 C40 RMS-032 C32, 36 CAPACITOR -.001 mfd., 600 v., paper RMS-039 600 v., paper mfd., --.01 CAPACITOR C20 RMS-040 v., paper CAPACITOR -.02 mfd., 600 C16, 19, RMS-041 60, 62 RMS-042 CAPACITOR -.002 mfd., 1000 v., paper C5I RMS-043 electrolytic v., dry CAPACITOR -30 mfd., 400 C46A RMS-044 CAPACITOR -30 mfd., 400 v., dry electrolytic C46B RMS-072 dry electrolytic 400 v., mfd., -15 CAPACITOR C46C dry electrolytic CAPACITOR -20 mfd., 25 v., C46D RMS-078 CAPACITOR -I5 mfd., 350 v., dry electrolytic C105A CAPACITOR -I5 mfd., 350 v., dry electrolytic C105B RMU-016 CAPACITOR -47 mid., ceramic C12 RMW-016 CAPACITOR -10 mmf., ceramic C67, 88 RMW-017 ceramic mmf., -I5 CAPACITOR C25,27,44 RMX-018 ceramic CAPACITOR -3.3 mmf., C87 RMX-019 CAPACITOR -1.5 mmf., ceramic C92 RMX-021 ceramic mmf., -5.6 CAPACITOR C71 CAPACITOR -100 mmf., ceramic C7, 11 RRC-014 CAPACITOR -5-80 mmf., pushbutton antenna C80 trimmer RRC-031 antenna mmf., pushbutton -9-180 CAPACITOR C81 RRW-010 trimmer CAPACITOR-45-380 mmf., pushbutton antenna RSP-002 C82 RSW-023 trimmer CAPACITOR-45-380 mml., pushbutton antenna RSX-003 C83 RTD-001 trimmer RTL -017 CAPACITOR-45-380 mmf., pushbutton antenna RTL -044 C84 trimmer RTL -045 CAPACITOR-200-250 mmf., trimmer capacitor RTO-012 C5 CAPACITOR-280-360 mmf., trimmer capacitor RTP-020 C58 CAPACITOR-475-575 mint., trimmer capacitor RWL-004 C59 CAPACITOR-2-20 mmf., trimmer capacitor C3 RWX-004 CAPACITOR-34-70 mint., trimmer capacitor C4 RYC-003 CAPACITOR -475-575 mmf., trimmer capacitor C56 CAPACITOR -280-380 mmf., trimmer capacitor C57 capacitor trimmer -45-80 mmf., CAPACITOR C63 CAPACITOR -34-70 mmf., trimmer capacitor C1 CAPACITOR -4-50 mmf., trimmer capacitor C55 CAPACITOR -3-30 mmf., trimmer capacitor C2 CAPACITOR -80-130 mmf., trimmer capacitor C65 CAPACITOR -3-30 mmf., trimmer for loop C54 CAPACITOR-3-30 mint., air trimmer PUSHBUTTON-Black pushbutton used at bot tom of strip only PUSHBUTTON-Black pushbutton used in upper five positions only CORD-Hoist cord 634' long CORD -Drive cord 40W ESCUTCHEON -For dial scale and pushbuttons BACK PLATE -Large metal panel plate KNOB -Black knob, plain KNOB -Black control knob with pointer ESCUTCHEON ORNAMENT -Left-hand plastic escutcheon ornament POINTER-Dial pointer and slide POINTER -Dial pointer SCALE-Tuning dial scale CORE -Iron core with glass tubing for broadcast antenna, r -f, and oscillator coils PIN-Hairpin cotter for securing shaft through pushbuttons PIN-Hairpin cotter for idler wheel SPRING CLIP-Holds FM coil assembly EYELET -For connecting FM coil links CLIP-Mounting clip for LI and L7 LINK -Hoist link holding end of hoist cord RING-Retaining ring for flywheel COIL LINK -Rectangular coil link for assembling FM coils T2 and TS COIL LINIÇ-Rectangular coil link for assembling FM coil, T4 POST-Mycalex posts for assembling all FM coils CONTACT PIN-For speaker connection RECEPTACLE-Pre -amp. and pushbutton receptacle PLUG -Sia -prong pre -amp. power plug PLUG-Phono power male plug PLUG-Male phono plug from pre -amplifier PLUG-Plug and cover for pushbutton cable SOCKET -Phono input socket PLUG-Shipping screw bole plug SOCKET -Octal socket for VS, V6, and V7 PLATE -For mounting electrolytic SOCKET -Dial light socket SOCKET -Octal socket for V4, V8, and V9 TUBE SOCKET-Tube socket for VI, V2, and V3 SOCKET -Phono power female socket RECEPTACLE-3 pin receptacle for Beam -a ac T1 L6 1,19 1,20 T13 T2, 5 T6 L5 L3 L2 L4 T4 T3 LI L8 L7 L9 L11 LLO L18 R25 S2 R35, 36 SS SI S3 TIO T7 T8 T9 Tll T12 PLU -Plug attached to Beam-a -scope COIL -Broadcast band antenna coil COIL-FM antenna choke coil COIL-FM oscillator cathode choke coil COIL-SW loop shunt coil COIL-Pushbutton antenna coil COILS -FM antenna coil and FM RF coil COIL-Broadcast band RF coil COIL-FM oscillator cathode choke coil COIL-SW band RF plate choke coil COIL-Broadcast band plate choke dummy COIL-FM RF plate choke coil COIL -FM band oscillator coil COIL-Broadcast band oscillator coil COIL-SW oscillator loading coil COIL-Broadcast band oscillator shunt coil COIL-SW band RF loading coil COIL-Filament choke coil CHOKE-Power line choke COIL-FM IF plate coil COIL-Oscillator plate choke coil CLAMP -For holding cover on RF unit CLIP -Support for clamp RMC-012 CLIP-For holding shielded phono cable SPACER-Metal sleeve on hoist pulley shaft VANE-Tuner vane for FM coils T2 and T5 VANE -Tuner vane for FM oscillator coil, T4 SUPPORT -Cabinet drop -lead support ROLLER-Presses against hoist shaft SPRING-Maintains pushbutton tension WASHER -"C" washer on idler pulley SPRING-Flat spring against hoist pulley shaft SPRING -Wire spring against hoist pulley shaft SPRING-Hoist cord tension spring SCREW -Iron core adjusting screw SPRING--Guide wire spring in elevator plate SPRING-Type 1 dial cord spring (earlier pro on SPRINGducti-)Type 2 dial cord spring (later production) SHAFT -Manual tuning shaft PULLEY -Main tuning drum PULLEY -Small idler pulley FLYWHEEL -Flywheel with setscrew PULLEY -Hoist pulley and shaft PLATE AND SHAFT -Elevator top plate and vertical shaft VOLUME CONTROL -2 meg. potentiometer tapped at I meg. SWITCH -Bap tone switch RESISTOR -1150 and 5000 ohm, w.w. SWITCH -Pushbutton switch SWITCH -Band change switch SWITCH -Treble tone and power switch TRANSFORMER -Discriminator TRANSFORMER -1st I-F transformer TRANSFORMER -2nd I -F transformer TRANSFORMER -3rd I -F transformer TRANSFORMER -Output transformer TRANSFORMER -Power transformer CORD -Power cord WIRE-Guide wire for pointer. STATION LIST -Call letter cards Rider www.americanradiohistory.com GE PAGE GENERAL ELECTRIC CO. CABINET: Color Height Width Depth STD 8 33 CONNECT S.W. ANTENNA JUMPER WHEN NO DIPOLE IS USED \ 300^ CONNECT JUMPER WHEN NO ANTENNA IS USED Wattage Radio only) (With phono) in. 7 I; v\ LINE r --- BLACKrO L- O ANT. VDIPOLE -J 6134 - - 2 L26 FM.AÉ 'SOMME SI SI - I q _ + 9 1x68 2 i°so5 IDD 1 GR. 6AG5 3 0F1 R2 2F C21 R65 820 15K LOOP PRI 2 SEC. 1.s - MEG R3 6 2` I I 2-20# 4 R23 100K 280- K L -350 BLACK = 82K4 0 I R2579 2200 R64 2.2 MEG 2200 I 064 27 -f\AA-- AVG R34 v 74 Sr 48 - OK AM AUDIO 47 0131 33 $I 3 22 6 -a K_ Y P N DIAL SI OR p L7 I g 1C27 e t20 1 COILRF 4B GI22 1.5 SIO MEG Ç 1.6 MEG 4.7 SI t, G = 1 N e ó RF ÌGOIL = R4I I)e O-4 0274 :I O-FI R26 ° G125 2,7 SW 5-80 C3 : PLATE 1000-1600 KG 8 D21MF 9-180 a L3 HOKE'. -T I Qñ : STD R -F ¡ I .C17 R4 ^ OFI OF2 G20 I R GII4 4.7 OK S2C 850-152ÔKG CI13 .-. 10- 8+260V I 9-180 B_ 850-1520KG ji G6 45-380 B+ 160V C136 22 GORE S2E 540-IO50KG LII x023 185-245 `2 STD 3 OSG COIL 12 FIV5 L9 G28 F.M. 3-30 3-30 2,1C J2 FM STO.BAND -÷050. SHUNT TUNING COIL (DIAL) S2F 540-1050KG 2 V3 C118 G119 L28 FM. SI O -S3 CHOKEI 68 OSC COIL F20 O 2F R9 18 Z2K .129 22 52G ' ? oF2 F1 20-55 - =22- PHONO MOTOR O PHONO F DIAGRAM FOR ACTUAL WIRING OF PHONO SWITCH SECTION S2H -SI 5 B -STD F2-FM2 I S2J -FMI -0 NINE SECTION SELF -CANCELLING PUSH BUTTON SWITCH. SECTION 52G ALTHOUGH NOT WIRED OPERATES THROUGH CANCELLING ACTION SWITCH SHOWN IN DIAL POSITION ()John F. Rider 117 VOLTS ; A-C, POWER CORD 1 MF MF 3.3 I 081 02 MF BASS TONE CONTROL C49 MEG. - 6I 7 J2 V V7 13/.7 V2 V3 V4 V8 V9 VII VIO VI4 8/\7 RED L24 P2 PLUG INTO J2 OFF 0102 100 = .02 G84 (MAO BASS POSITION) SWI 0-53-SW3 100K _ OF 3 R37 G83 R16 33 0-52-9112F O 680K RI5 6 R18 Vn5 POSITION SHOWN IS FOR STANDARD BROADCAST POSITIONS, DESIGNATIONS FOLLOW: oE 330K $WITOGH ALL FIVE POLE SWITCHES, SI, REPRESENT THE EQUIVALENT SWITCHING OF THE BAND SWITCH, SEE RIGHT CENTER OF I 22K 82 R38 MEG. 58 t 15MF 47K XX R73 R36 CONTROL 02 MF 6800 55 TREBLE TONE (MAX TREBLE G51 7_T l'1033 320-400 CONTROL 22K RI7 68K .02 MF S ck41.oe 41 O 4- PICKUP L22 540-1-1050 KG S2H JI 051 LK) SW C120 B,i S3 G12(7251182 V13-6SG7 PI =- \\\ PHONO PREAMP. C43 27 47 F20 of -10 15MF MF 2 MEG R39 47K A 6AK5 VOWME TiG0817MF 1004 .002101. .002 MF 012_ &Eel - C85 - RII 68K OSCILLATOR 4.7 R66 33 3f TIME 33 O G7 45-380 PART OF PUSH BUTTON SWITCH AT LOWER LEFT 0112 G35 TUNING VANE TUNING C5 SWITCH SECTION 18K E20 6Fl IRON 45-380 0124 OIMF RED L19 S2Q 12 -89 C121 G4 R42 22 R75 GI15-O NIF GI33 100 _ TRANS. 02 MEG 475575 3 -F G92 47 S C39 1.5 10 i R69 220 33MÉG 1 T3 STO _G128 20-50 é 6.15 RED 320400 IB5245 PHASE INVERTER ve I G40 4F I - VI4 -6AL7GT SWITCHING TAKES PLACE. NUMBER IS CLOSEST TO PANEL .E ANO A DESIGNATE FRONT AM) REAR SURFACES 1470105 MF G37 SI 0 AUDIO AMPLI DIMFI TUNING INDICATOR RIO z .L6 e7F QSI F LOCATE SWITCH WAFER WHERE G42 S3 S28 FI S3 680K 078 111A. Fl `THESE SYMBOLS ) G26 47 T S R7 IOOK DIAL TUNING CORE -r cm 05MF Ett 160V 47K 4F 6V6GT T0514F 2200 SI 1 SI AUDIO OUTP- UT VII eMBISIMMB LSFIOF2 34C70I23 1000 nVVN V2-6AK5 5 11 OF2 o S2A 4F O1Si -0...OB R6 R70 052 R49 1000 075 2.2 Á1EG AVG CONVERTER 530 - in f 002 MF 10K R28 MEG 094 .05 MF e 22K R79 35 I 82e GIOOD 470K R78 1000 02MF PRI 1, 013 -. 071 F.M R R59 IOOK - 8t 260 WHITE 531 220 R48 3p 4702 ~1 OIMF R27 22K F RED R50 33 1070 F2 SI F2 S30, 8+ 260V 274 R33 120K _ - - - -- 1- 32 920 858 120K IDOK 217 R56 4704 R32 0.7 R24 063 02MF C97 R47 20$ r S7 OIMF 1 NÉ6 = I 5 1 MG 350 47 05MF 3-30 AUDIO OUTPUT VIO FOLLOWER _ G67 -4 NGE 455KG MC 3 SOUELCH 470 C53 47 3 5 I R20 10109 102MF DIME f-1 2 ¡' DIMFI 10.7 220 6 C73 I T FM. DISCRIMINATOR AUDIO CAT V7 6A07GT GREEN G ON REAR APRON ANT TRANS. .05MF R61 IFI- 048 1.OSMF SHUNT `4 PB 10.7MG 455 kc 10.7 mc FM Intermediate Frequency V6 6SV7 T6 3RD IF OWE IC105 WHITE 1001 LOOP 3-30 r--- VS 11.5-12.0 mc 14.8-15.5 mc 2 3 AM Intermediate Frequency A.M.DEI. 8 F.M. LIMITER AM IF AMPLIFIER 65V7 1 R21 0F2 SI 1 Shortwave Shortwave Shortwave 42-49 mc 88-108 mc 540-1600 kc 9 4-9.8 mc 1 2 Broadcast... 2.7 B G9 o IMC 470 R67 33K L25 Ie L C56 C106_ C16 1.5 3 #s4ó 3 100 BOTTOM TI F -M CHOKE IB I B I4055. 27 025 220 15 ¡ Al- VI J3 LI AMPLIFIER R.F. SI O IRON TUNING GORE -~ LOOP ANT. 1 T Q2 CS' ' osl Flq O F2 G30 II 27 KG 4 . OFI AF2 154á 5 (-LTS-2N0IF_I 455 4 65G7 046 0 X06 Lit B zI SI F.M. GIiOKE V4 _- 0S2 OS L15 455K0 TI I FM I 51 1 VANE ANT. COIL RED 6'1-'0130 RI TUMNG ,E -U T4_15T IF_ 1 L2 SI L13 I.0 MEG J (n . IF AMPLIFIER Frequency Modulation Frequency Modulation 60 cycles 110 watts 135 watts watts watts 110 135 I 18!.i in. Rating A6 105-125 AS 105-125 50 cycles Voltage. Frequency Mahogany 34% in. . . Rating 502 Wood MODEL 502 OPERATING FREQUENCIES: ELECTRICAL RATING: Model... Material 17-39,40 C103 - RED R52 1260 R53 4900 013 TOO TOO PILOT LAMP I BLI.C.X RED 60x. RED L23 Nets F.M. FOR 50 CYCLE OPERATIQN LINE CHOKE Ng. 8. Schematic Maltreat for model 302. BREAK CONNECTION AT X. AND CONNECT TO TAP AS SHOWN BY DASH LINE For similar circuit and tuner notes sea Mödels 41 to 45, RECORD CHANGER: pages 17-4 through 17-8 www.americanradiohistory.com 79 POWER TRANS, GE Model P4, RCD. CH. 17-5 GE PAGE GENERAL ELECTRIC 17-41 MODEL 502 CO. PAGE 17-42 GE GENERAL ELECTRIC MOD L 502 CO. ALIGNMENT TABLE (Cont'd) ALIGNMENT. 1. 2. 3. 4. Test oscillator with tone modulation. íSee Table.) D -c voltmeter or microammeter. (See Notes 2 and 3.) A -c voltmeter, 2.0 volts. (See Note 6.) Insulated hex wrench, 3. -inch. 5. 6. 7. Step mfd. paper capacitor. 400 -ohm, % watt resistor. 200 mmf. mica capacitor. .01 Signal Signal Generator Frequency Band Switch Input Point Dial Setting See Adjust . - Peak C60 A: C59 4, 5, 6 STD Peak C56 8s C55 4, 5, 6 STD Peak C45 8s C46 4, 5. 6 455 kc Cony. grid directly STD 2 455 kc Cony. grid directly 3 455 kc Cony. grid directly Point 10.7 me - 5 6' As in step 7 10.7 me 8 10.7 me 10.7 me 9 5 2nd 6SV7 grid thru .01 mf FM1 2nd 6SV7 grid thru .01 mf FM1 2nd 65V7 grid thru .01 mf FM1 1st 6SV7 grid thru FM1 6SG7 grid thru .01 FM1 .01 mf mf Cony. grid directly - FM1 zero" Signal Generator Peak C67 SW2 Do not change Peak C40 5, 6, 8 11.8 me Antenna thru 400 SW2 Do not change Peak C14 5, 6, 11 22 9.6 me Antenna thru 400 SW1 9.6 me -4.0 to Peak C33 5, 6, 7, 10 23 9.6 me Antenna thru 400 SW1 Do not change Peak C39 5, 6, 8 24 9.6 me Antenna thru ohms SW1 Do not change Peak C13 5, 6, 11 21 ohms ohms ohms ohms 4.1 1, 2 Adjust C68 for zero meter reading. Apply 1 volt signal input. 400 1, Detune signal generator to point of maximum meter reading. 1, 2- 2 8s L14 1, 3, 4 Set dial accurately-then adjust C28. Peak C27 1, 3, 8 Tune dial for maximum output-then peak C27 while rocking dial. Peak C12 1, 3 DIPOLE terminals FM1 46 14 46 me DIPOLE terminals FM1 For max. output 15 46 me DIPOLE terminals FM1 Do not change C28" C118' 1, 3, 7, 10 Set dial accurately --then adjust C118. Peak C123 1, 3, 8 Tune dial for maximum output-then peak C123 while rocking dial. Peak C15 1, 3 Peak ohms 'Important! See Note 7, **Use insulated hex wrench, ©John SW3 15.2 me -3.7 Peak C31 5, 6, 7, 10 Set dial accurately-then 400 SW3 Do not change Peak C37 5, 6, 8 Peak C37 400 SW3 Do not change Peak C9 5, 6, 11 C9 is located on back apron thru 400 SW2 11.8 me -3.35 Peak C34 5, 6, 7, 10 Antenna F. Rider 1'. to 3.45 in. Extreme right- Peak C10 hand position 5, 6, 11 28 1500 kc Antenna thru mmf STD 1500 kc-1.35 to 1.45 in. Osc. 200 Peak C40 while rocking dial. Set dial accurately-then adjust C33. Peak C39 while rocking dial. STD For max. output Antenna mmf thru 200 STD Do not change Antenna mmf thru 200 STD For max. output while Use unmodulated signal. Connect 20,000 ohms -per -volt meter from junction of R30 and C72 to chassis. Use ten volt scale (steps 4-6). 3. Connect 20,000 ohms -per -volt meter from grid (pin 2) of 6SV7 LIMITER to chassis with a 200,000 -ohm resistor connected in series. The resistor must be connected directly to the grid so that capacity loading will be negligible and so that the meter is isolated from the i -f signal voltage. Keep signal generator output down so that the meter indicates not more than one volt at the grid (5 microamperes through 200,000 ohms) (alignment steps 7 to 15). 4. Connect signal generator directly to the converter grid at some convenient point. The generator lead must be shielded up to this connection so that not more than 1/16 inch of 2. dial. exposed lead exists. Ground the shield solidly by clamping it firmly to the chassis or a shield as close to the connection as possible. (Steps 1-3, 9.) 5. Use 400 -cycle modulation. 6. Connect a standard output meter across the speaker voice coil. Turn volume control fully on. Keep signal generator of chassis. Set dial accurately-then adjust C34 R -F coil, T3 iron slug 5, 6, 9 T3 iron slug is the center one on left side. Ant. coil, T2 iron 5, 6, 9 T2 iron slug is the front one on left side. 5, 6, 8 Peak L16 while dial. slug Peak L16 on left side. rocking 34'. 1. rocking L11 iron slug is the rear one Repeat steps 25-31. Notes in Connection with Alignment Table adjust C31. Lii 5, 6, 7, 9 coil iron slug 200 Important! See Note 7, Use insulated hex wrench, SW-IF ALIGNMENT 11.8 me STD 32 1, 3, 7, 10 46 me 19 thru 200 580 kc 13 ohms Antenna mmf 31 Do not change Antenna thru 1620 kc 6AQ7GT tube removed from socket. FM2 15.2 me 27 1000 kc DIPOLE terminals 18 5, 6 30 98 me thru Extreme right- Peak C17 hand position 6AQ7GT tube removed from socket 12 Antenna ohms STD 1, 3 For max. output 15.2 me thru 200 L15 FM2 17 Antenna mmf 8s DIPOLE terminals in. 1620 kc Peak C57 in. to 3.8 26 Antenna thru mmf 98 me ohms 5, 6 1000 kc 11 Antenna thru 400 Extreme right- Peak C23 hand position 29 98 me -3.55 to Peak 15.2 me STD 6AQ7GT tube removed from socket. FM2 16 thru 200 1, 3 Peak C47 me -3.25 to 3.35 in. Antenna mmf C73 FM -RF ALIGNMENT 3.65 1620 kc 8s DIPOLE terminals in. 25 Peak C62 98 me Remarks Note BROADCAST RF ALIGNMENT C68 for 10 See Adjust thru 400 11.8 me FM -IF ALIGNMENT 4 Dial Setting Antenna 20 Remarks Note AM -IF ALIGNMENT 1 Band Switch Input SW-RF ALIGNMENT (Cont'd) ALIGNMENT TABLE Step Signal Signal Generator Frequency EQUIPMENT REQUIRED: output down so that the meter indicates not more than watt output (2.0 volts) during alignment. 7. If dial scale is not available, index pointer as follows: Turn pointer to right-hand limit of travel. Mark the dial backplate at a reference edge of the pointer slider. Then set pointer by turning dial knob until the indicated dimension exists between the reference edge and the mark. 8. "Rocking" consists of adjusting the indicated adjuster while turning the dial a small amount back -and -forth through peak output. The object is to find the maximum peak. Rocking is necessary and is permissible only when interlocking circuits are being adjusted. 9. The main iron tuning slugs are suspended from the left side of the tuning "elevator." They are individually adjust - able by loosening the locknut and turning the supporting screw into which the suspending wire is soldered. 10. Two oscillator settings may give response. The higher frequency response point is the correct one; the other is the image. If in doubt, start with the trimmer screw loosened completely and adjust for the first response. 11. Loop antenna must be plugged in when aligning antenna trimmers C9, C10, 13, and C14. 1 ©John F. Rider For trimmer locations see page 17-45 GE PAGE 17-43 MODEL 502 GENERAL ELECTRIC CO. 2 1 Ng. 1. Olas stringing diagram showing spring details of right. POWER OUTPUT (117 volts line): Undistorted Maximum 10 12 watts watts LOUDSPEAKER: Alnico PM 12 inches 8 ohms Type Size. Voice Coil Impedance. ANTENNA INPUTS: Conventional antenna Broadcast and Shortwave 300 -ohm input for folded dipole FM Identification of switch lugs set inverted and viewed from panel. Ng. 3. Ng. 2. levator windless stringing prosedere. PHONOGRAPH PICK-UP: Variable reluctance 250 ohms Type. D -c Resistance 4+d0 .Il[ lf0 CMCUS OO.Yv TEMMILL5 LOOP DO, FRONT OF CHASSIS FRONT OF CHASSIS ;p TRTO TEM.2_ 0-1 IOU KAU c0wv aOi O1OOE 14[ DeDr6.01411 .ld wa0 á547E Of C0K3 lil 6.0741 LOOK1M4 FROM moo Of Cw.55.5 I K- -- N IA TO t -11 BOTTOM Ng. 4. ®John Terminal Identifkatlon of coil assemblies (Numbers correspond with schematic). F. Rider www.americanradiohistory.com TERMINALS REFER SCHEMATIC DIAGRAM LETTERS ON S2A VIEW Ng. 7. Wiring of push-button switch. PAGE 17-44 GE MODEL GENERAL ELECTRIC CO. 502 WIRING OF BAND SWITCH SECTION St this _connect lug- Wire length given from end to end before stripping 1 connected to this Antenna terminal at rear of chas- Insulated green wire, 1334" long 1 - -M e other end of which is title- -c U this lug- t SECTION 4 -the this- 1 Copper strap with tubing, 3" long Trimmer C123, lug nearer L7 2 Copper strap with tubing, 21/2", long Coil L8, terminal 2 3 Insulated brown 4 Insulated green wire, 21/4" long Trimmer C39, lug nearer T3 5 Insulated green wire, 2" long Trimmer C40, lug nearer T3 6 Shod copper strap Trimmer C37, lug nearer 1.7 7 Shod copper strap Tuner 8 Capacitor, C41 Tube socket, V2, pin 9 Bus with spaghetti, sis 2-3 win, 7" Dial switch 52A, terminal O long 3 Switch section 2, lug Capacitor C8 4 11 5 (Front lug) capacitor C30 (Rear lug) short copper strap 6 ea7 e. C11 b. One side of 300 -ohm transmission line Chassis Trimmer C12, lug nearer T2 Tube socket VI, pin 2 Hot dipole terminal at rear of chassis I 9 a. Short bus with spaghetti, 134" long b. Shod bus with spaghetti 10 Insulated white wire, 51/2" long 11 a. Insulated green wire, 334" long b. Insulated orange wire, 6" long c. Insulated green wire, 1234" long 12 See 2" long Insulated white wire, 21/2" long 11 o. See section 3, lug 9 b. Copper shoe with tubing, 31/2" long Dial switch S2 -A terminal N 12 lug 9 above SECTION 2' SECTION 2 I a. Bars with spaghetti, b. Capacitor, C119 Ground on band switch shield Choke, 1.23 2 a. Insulated green wire, 2%" long 2 a. Insulated green wire, 31/4" long b. Capacitor, Cl Trimmer CIO, lug nearer T2 Section 2, lug 12 3 Insulated green wire, 21/4" long Trimmer C13, lug nearer 12 4 Insulated green wire, 2" long Trimmer C14, lug nearer T2 Short copper strap Tuner L2, terminal nearer rear of chassis 8 Capacitor C16 Tuba socket Vl, pin Insulated brown wire, 6" long '*11 12 a. Insulated yellow wire, 12%" long Dial switch S2 -A, terminal 0 L16, Trimmer C39, lug nearer L11 Trimmer C34, lug nearer L11 Trimmer C37, lug nearer T3 Trimmer C31, lug nearer L16 Trimmer C123, lug nearer tuner L7 C118, right-hand terminals 3N" long Air trimmer Shod copper step Tuner L9, left-hand terminal* B Resistor, R66 Capacitor, C35 9 10 a. Shod copper strap b. Copper strap with tubing, 314" long Section 6, lug 11 11 a. Capacitor, C129 b. Copper strap with tubing, 3" long Chassis ground oscillator coil SW 1.10, terminal 2 oscillator coil L10, terminal SW 1 12 Loop socket J3 at rear of chassis, b. See section 1, lug 4 terminal a. Insulated blue wire, 61/2" long See lua 2, above Dial switch S2 -A, terminal M b. Broadcast oscillator coil, terminal 1 Dial switch S2A, terminal T 7 1 9 10 Copper strap with tubing, 2" long 1 (a) above Capacitor, C128 Copper strap with tubing, 1 a. Sae lug c. 7 long a. Candler, C114 b. Trimmer C1S, lug nearer tube VI Short copper strap Insulated green wire, 2" long 6 5 6 Insulated green wire, 4 b. Coil L8, terminal 1 Section 3, lug 6 Section 6, lug 1 3 5 1 S long 2A" rear terminal Terminal strip 2, terminal 10 Chassis Section 1, terminal 12 Antenna transformer T2, terminal 2 Push-button transformer T1, terminal 2 Loop socket J3, at rear of chassis, terminal 1 1.7, Ground lug on terminal strip 2 b. Insulated blite wire, 61/2" long 1 - other end of which is connected to this *Looking from front, chassis inverted. **Double lug (front and rear) soldered together. 3 SECTION 6 At this -connect Ibis- lug- SECTION 3 -the - other end of which is connected to this I 1 2 a. Choke, L6 b. Capacitor, C18 Insulated red wire, 3" long d. Insulated red wire, 534" long c. Insulated green wire, 21/4" long 3 Switch section 3, lug 9 Ground on bond switch shield RF transformer T3, terminal 1 Terminal strip 1, terminal 2 RF transformer T3, terminal a. See section 5, lug b. c. 1 Capacitor C120 Copper strap with tubing, 6" long Insulated block wire, 53/4" long 1st IF transformer T4, terminal 8 3 Insulated green wire, 2'/4" tong Broadcast oscillator coil minal 3 7 Shod copper strap Air trimmer C28, right-hand ter- 8 Copper strap, 2" long 9 Insulated orange wire, 2 1.16, ter- 4 5 6 Short bus with spaghetti, 134" long Terminal strip 2, terminal 4 5 7 Insulated yellow wire, 16" long Resistor R60 on terminal board on chassis rear apron 6 a. Resistor, RIO b. Capacitor, C124 c. Insulated blue wire, 81/4" long Tube socket V3, pin 5 Ground lug on band switch shield Push-button switch S2H, terminal A 9 minal* 2 4 8 Tuner L9, right-hand terminal* Air trimmer C118, left-hand ter- a. See lug 2 (a), above b. Capacitor, C26 10 Resistor, R26 F. Tube socket V3, pin 7 3'h" long 4W long 11 10 Insulated green wire, Ground lug on terminal strip 2 11 See section 5, lug 10(a) Section 4, lug 12 11-12 ©John minal* Rider www.americanradiohistory.com 1st IF transformer T4, terminal 5 1st IF transformer T4, terminal 3 GE PAGE 17-45 GENERAL ELECTRIC CO. MODEL 502 o o óú a 0 O U P M U o v U U N U £ Y o o cv 0 N el f 1-- 4.1 S= ®John F. Rider www.americanradiohistory.com - N M v PAGE 17-46 GE MODEL 502 GENERAL ELECTRIC CO. VI grid V1 grid V2 grid V2 grid V4 grid V4 grid V5 grid V5 grid STAGE GAIN AND VOLTAGE CHECKS Stage gain measurements by vacuum tube voltmeter or similar measuring devices may be used to check circuit performance and isolate trouble. The gain values listed have a tolerance of *20%. AM i -f measurements should be taken with low signal so that AVC is not effective. R -f measurements should be made by measuring the d -c voltage developed at the r -f tube grid (V1) or converter tube grid (V2) by rectification of the signal. (I) R to to to to to to to to V2 V2 V4 V4 VS V5 grid grid.......... grid grid.. .... grid grid. V6 grid V6 grid. ... _ .. . .... ® 45 me ® 98 me 7 ............ 6 24 (i) 455 kc ..30 d 10.7 me ® 455 kc 17 56 ® 10.7 me 50 ® 455 kc ... ... _ .....20 ® 10.7 me (2) AUDIO GAIN .12 volts at 400 cps to V7 grid with volume control set at maximum will give approximately % watt output across the speaker voice coil. .10 volts at 400 cps at grid of V8 will give approximately watt output across the speaker voice coil. -F AND I -F STAGE GAINS Signal applied through IRE dummy antenna: Antenna post to V1 grid 3 (o'. 1000 kc 1 5 L> 9.6 me Antenna post to VI grid 1.3 (a: 11.8 me Antenna post to VI grid ? 15.2 me 1 2 Antenna post to VI grid Signal applied through 300 ohms, including signal generator (3) OSCILLATOR GRID BIAS D -c voltage developed 12 v. (d 1000 kc impedance: 1.5 O 45 me Dipole terminals to VI grid 1.0 (0 98 me Dipole terminals to VI grid.. .. These checks made with oscillator tube (V3) removed: 10 LS 1000 kc V1 grid to V2 grid ....6 (q) 9.6 me V1 grid to V2 grid. ... 7 4i 11.8 me VI grid to V2 grid .. .... V1 grid to V2 grid .11 (g? 15.2 me ....... 2.8 v. (a) 4.7 v. ® 9.6 me ..... across R9 (average): .. . 11.8mc...... 6.5 ® 15.2 me 4 6 ®45 me 3.0 (q` 98 mc (4) SOCI(ET PIN VOLTAGES ... ............ Figure 6 shows typical tube pin voltages. All readings should be made from the pins to ground unless otherwise indicated. V5-6SV7 SCREEN CATHODE +2.9 +180 PLATE +891F.M.BAND) +160(A.M. BAND) PLATE + 260 6.3 AL. 3 A.C. V7-6AQ7GT V13-6SC7 V4 3.15 A.C. 3.15 AC. -65G7 PLATE +250 SCREEN +175 PLATE' +80 O 3 A.G. PLATE AT O V8 -65Q7 +2.8 6.3 &C. BOTTOM VIEW OF CHASSIS SHOWN J V3-6AK5 ALL VOLTAGES MEASURED TO CHASSIS USING A +160 20,000 PLATE OHM PER VOLT 6.3 AC. PLATE +45 VIO-6V6GT V2-6AK5 SCREE 6.3 A.C. +260 SCREE + 130 PLATE PLATE THODE +330 +205 6.3 CATHODE + 125 METER +160 A.C. VI-6AG5 SCREE +150 PLATE +215 6.3 A.G. F. +I60 PUTE Qss CATHODE SCREEN ©John PLATE C+T6`;NODE 95 AT +60 VI2-5U46 + 3ao V 6.3 AL. VII-6V6GT PLATE + +16 330 SCREE 6.3 A.G. CATHODE +0.9 Rider www.americanradiohistory.com +260 PLATE +330 63 A.G. CATHODE +16 GE PAGE 17-47 GENERAL ELECTRIC CO. M011EL MODEL 502 -REPLACEMENT PARTS LIST CAT- NO. ( DESCRIPTION SYMBOL CAT. NO. UNIVERSAL REPLACEMENT PARTS CAPACITOR-.002 mid., 600 v.. paper CAPACITOR -.003 mfd., 600 v., paper CAPACITOR ---.005 mid.. 600 v.. paper CAPACITOR -.01 mfd., 600 v., paper UCC-036 UCC-037 UCC-039 UCC-040 C85, 88 C49 UCC-041 C18, 50, 51, CAPACITOR --.02 mid.. 600 v., paper UCC-042 C79, 81, 82, CAPACITOR -.03 mfd., 600 v., paper C91 C52, 65, 74, 78,87,90, 103, 116, 124 63, 71, 75, 80, 83, 93, 108. 109 84 UCC-045 UCG-3034 UCN-502 UCN-505 UCN-506 UCN-1550 UCU-020 UCU-028 UCU-516 UCU-520 UCU-528 UCU-536 UCU-544 UCU-1014 UCU-1504 UCU-1512 UCU-1532 UCW-012 UCW-1004 UCW-1014 UC W -1024 UC W -1028 UCW-1504 UDL-005 UDL-008 UOP-1230 URD-009 URD-013 URD-033 URD-041 URD-049 URD-057 URD-059 URD-061 URD-069 URD-073 URD-077 URD-081 URD-085 URD-089 URD-093 URD -095 URD-097 URD-099 URD-103 URD-109 URD-113 URD-117 URD-121 URD-123 URD-125 URD-129 URD-133 URD-141 URD-1086 URE -071 URE -073 URE -089 URF-035 URF-075' RAB -02a RAB -025 RAD -011 RAD -015 RAD -02t C48, 53, 76. 105, 107, 110, 58, 19. 42 C129 C20 C114 Cl, 8 C21 C92 C77, 102 C131, 132, 136 C26, 70 C72 C25 C43, 125 CAPACITOR -.05 mfd., 600 v., paper CAPACITOR -180 mmf., mica CAPACITOR --1.5 mmf., ceramic CAPACITOR --4.7 mmf, ceramic CAPACITOR -6.8 mmf, ceramic CAPACITOR -820 mmf., ceramic CAPACITOR -47 mmt., mica CAPACITOR -100 mmf, mica CAPACITOR -33 mmt., mica CAPACITOR --47 mmf., mica CAPACITOR --100 mmf, mica CAPACITOR --220 mmf., mica CAPACITOR --470 mmf, mica C64, 101 CAPACITOR -27 mmf., mica C113, 115 CAPACITOR ---I0 mmf., mica C112 CAPACITOR -22 mmf., mica C134 CAPACITOR-150 mmf., mica C24 CAPACITOR -22 mmf, ceramic CI19, 128 CAPACITOR -10 mmf., ceramic C44, 54 CAPACITOR -27 mmf, ceramic" C120 CAPACITOR -fib mmf., ceramic C69 CAPACITOR-100 mmf., ceramic C117 CAPACITOR-3.3 mint., ceramic Il, 2 PILOT LIGHT -Mazda No. 44 I3 BEZEL LIGHT -Mazda No. 47 SPEAKER -12 -inch speaker R69 RESISTOR --22 ohms, 54 w-, carbon R66 RESISTOR -33 ohms. Si w.', carbon R10, 61 RESISTOR -220 ohfrro, 54 w.. carbon R20 RESISTOR -470 ohms, 54 w., carbon R46, 49, 68, RESISTOR=1000 ohms, 54 w., carbon 71, 77 R21, 28, 56 RESISTOR-2200 ohms, 4 w., carbon R43, 58 RESISTOR-2700 ohms, 54 w., carbon R62 RESISTOR -3300 ohms, St w., carbon R73 RESISTOR -6800 ohms, 54 w.. carbon R31, 79 RESISTOR -10,000 ohms, 54 w., carbon R65 RESISTOR -15,000 ohms, 54 w.. carbon RO. 27, 36, RESISTOR-22.000 ohms, 54 w., carbon 39, 78 R44, 67 RESISTOR -33,000 ohms, 34 w., carbon R11, 13, 25 RESISTOR -47,000 ohms, 54 w., carbon R17, 19, 72 RESISTOR-68,000 ohms, 54 w., carbon R60 RESISTOR -82,000 ohms, 54 w., carbon R3, 7. 15, RESISTOR -100,000 ohms, 54 w., carbon 23, 24, 59 R32, 33 RESISTOR -120.000 ohms, 54 w., carbon R8 RESISTOR-180,000 ohms, 34 w., carbon R37, 38 RESISTOR -330.000 ohms, 54 w., carbon R30, 47, 48 RESISTOR -470,000 ohms, 34 w., carbon R14, 41, 74 RESISTOR -680,000 ohms, 54 w., carbon RI, 34, 63 RESISTOR -1 meg., w., carbon R42, 57 RESISTOR -1.2 meg., 3.4 w.. carbon R2, 6, 70 RESISTOR -1.5 meg., 54 w., carbon R22, 35, 64 RESISTOR -2.2 meg., 54 w., carbon R16, 18, 80 RESISTOR -3.3 meg., 54 w., carbon R40 RESISTOR -6.8 meg., 54 w., carbon R45 RESISTOR --36,000 ohms, 54 w., carbon R51 RESISTOR -8200 ohms, 1 w., carbon R4 RESISTOR -10,000 ohms, 1 w., carbon R26 RESISTOR -47,000 ohms. 1 w., carbon R50 RESISTOR- -220 ohms, 2 w., carbon )00 ohms, 2 w.. carbon back assembly. 50 cycle back assembly, 60 cycle Z d switch front O L7 kl RAL-001 RAX-01t o RCC-038 RCC-044 RCC -045 RCC-056 RCS -002 a RCE-014 O RCW-001 RCW-024 RCW-025 RCW-102 7 W d switch rear coil on rear bracket of band ht bezel W ROLLER -Fork assembly for 54 mfd., 600 v., paper .0 mmf., mica 5 mfd., 600 v., paper )2 mid., 1000 v., paper mfd., dual electrolytic ectrolytic mmf., ceramic mmf., ceramic ' mmf., ceramic mmf, ceramic UNIVERSAL REPLACEMENT PARTS RCX-028 TRIMMER STRIP -Push button TRIMMER STRIP AND COIL ASSEMBLY Push button TRIMMER STRIP ASSEMBLY -3.30 mmf., C12, 15 80-130 mmf., trimmer capacitor C23, 31. 33, TRIMMER STRIP -185-245 mmf., 20-55 mmf., 34 320-400 mmf., 165-225 mmf., trimmer capacitor C17, 39, 40 TRIMMER STRIP -20-55 mmf., 475-575 mmf., 320-400 mmf., trimmer capacitor C27.37. 123 TRIMMER STRIP -2-20 mmf., 185-245 mmf., 34-70 mmf., trimmer capacitor TRIMMER STRIP -34-70 mmf., 40-80 mmf., CIO, 13, 14 RCY-011 RCY-017 C9 C28, 118 RDB-008 RDC-025 RDF-003 RDK-036 RDK-039 RDP-026 RDS-021 RDS-028 RDX-019 S2 RCX-012 RCX-021 RCX-024 RCX-025 RCX-026 RCX-027 REI -006 RHE-001 RHM-024 RHN-004 RJP-004 R JP -006 RJP-007 RJP-008 RJS-012 RJS-034 RJS-037 RJS-044 RJS-051 RJS-053 RJS-054 R JS -065 RJX-003 RLA-006 RLA-009 RLA-012 ©John F. C2, 3, 4, 5, 6, PI 72 JI TI T2 L26,28 L17, 18, 19 L20, 21, 22 T3 L6 L3 RLC-015 RLC-016 RLC-017 RLF-007 RLI-002 RLI-005 RLI-018 RLP-005 RLP-008 L10 L16 L8 L24 L23 L12 L25 L14, 15 L5, 13 L11 RMM-010 RMM-011 RMN -016 RMR-002 RMS-040 RMS-04 I RMS-042 RMS-043 RMS-044 RMS-076 RMS-078 RMW-013 RMW-0t8 RMX-019 RMX-021 RPX-010 RRC-019 RR W -004 RSS-003 RSW-016 RSW-017 RTD-001 RTL -017 RTL -019 RTL -022 RTO-014 RTP-023 RTP-032 RWL-004 RTC -002 RYC-006 RTC -007 R54, 55 R52, 53 S7 S5 S4 T7 T4 T6 T5 T8 T9 T70 - 7 RLA-025 RLA-026 RLB-006 RLB-008 RLB-009 RLC-014 RYC-008 O I DESCRIPTION SYMBOL 5-45 mmf., trimmer capacitor CAPACITOR-3-30 trimmer TRIMMER STRIP -3-30 mmf., 3-30 mmf., trimmer capacitor PUSH BUTTON -Mahogany DRIVE CORD ASSEMBLY WASHER -Felt for control knobs KNOB -Mahogany (plain) KNOB --Mahogany (arrow) POINTER -Assembly SCALE-Dial scale SCALE ASSEMBLY-Dial SWITCH ASSEMBLY-Push button IRON CORE -AM tuning EYELET-For connecting FM links LINK --Hoist link, holding end of hoist cord NUT -Hex nut for tuning vane adjustment PLUG --Phono, male PLUG -Three -prong loop plug RECEPTACLE-I10 v. SOCKET -Tuning eye MOUNTING PLATE -For C99 SOCKET -Pilot light MOUNTING PLATE -For C100 TUBE SOCKET -For Vl, V2, and V3 SOCKET -Three prong at rear of chassis SOCKET -Tube for V13 SOCKET -Tube SOCKET -Dial light socket and leads JACK -Phono TRANSFORMER-B.C.P.B. antenna TRANSFORMER-B.C. antenna transformer CHOKE -FM antenna choke, FM oscillator cathode choke COILS -Push-button oscillator tuning coils COILS -Push-button oscillator tuning coils COIL -Broadcast band r -f coil COIL -SW band r-f plate choke coil COIL -Broadcast r -f primary dummy COIL -Broadcast band oscillator shunt tuning coil COIL -SW oscillator coil COIL -Broadcast band oscillator coil COIL -SW r -f coil -f filament choke COIL COIL -FM power line choke COIL -FM oscillator cathode choke COIL --SW loop shunt coil -f plate choke COIL COIL -FM r -f plate choke and i -f wavetrap inductance VANE -Tuner vane for coils L2 and L7 VANE -Tuner vane for oscillator coil L9 PULLEY -Drive pulley ROLLER -Presses against hoist shaft SPRING -Flat spring against hoist pulley shaft SPRING -Wire spring against hoist pulley shaft SPRING --Hoist cord tension spring SCREW -Iron core adjusting screw SPRING -Guide wire connecting runing vanes to adjustment screws SCREW --For tuning vane adjustment SPRING -Type 2 dial cord spring FLYWHEEL -Less setscrew PULLEY -Hoist pulley PULLEY -Hoist pulley and shaft TUNER -Top plate and shaft assembly PHONO PICK -UP-Less tone arm VOLUME CONTROL -2 meg., dual RESISTOR--Wirewound SWITCH -Squelch switch SWITCH -Treble wafer switch SWITCH --Bass wafer switch TRANSFORMER ---FM discriminator transformer TRANSFORMER -1st i -f transformer TRANSFORMER -3rd i -f transformer TRANSFORMER -2nd i -f transformer TRANSFORMER --Output transformer TRANSFORMER -Power transformer, 60 cycle TRANSFORMER -Power transformer, 50 cycle CORD AND PLUG --For 117 v. a -c to main -I -I chassis MANUAL LIST TAB -Push-button key tab (phono) STATION CALL LETTERS -For push-button keys TAB -Push-button key tab (OFF) 502 ..«...S.,... GEN IMP. PAGE GENERAL IMPLEMENT CORP. CONVERTER T2 I. F. 12567 14, 12SK7 COIL F 1 2nd 1On DETECTOR-AVCrlST. AU010. A.F. OUTPUT Pm SOLS 12507 F COIL 1 óid 6 0 b a 0 a L4 3 '10 411 3 1 T3 MEG Illw 10 I) (8 216 R2 Shin ._..7 Ci 40.20 0001 600,, ISO M.V. C6 -- SPKR 2An. /4011 ion 2 17-1 MODLL 1A5 r ELECT. C C10 SEE GAIN DATA .00c1 R 600 c: 1 b \O v 3525 RECTIFIER sn 3 G G 4 TUNING SHAFT FILAMENT 12507 TWO TURNS 400V 50L6 SWITCH ON V C VOLUME 2 CONTROL T4 LINE 4 O 7 (8 OSC COIL GANG CONO 125117 CIRCUIT 12SA7 0 47 MAZDA CHASSIS NLOTTIGHT GROUND LOOP ANTENNA C4 1.2.0 1 R GANG C3 AC 60 CYCLE OR DC - io COND. C1 R.F. r L. DRIVE ASSEMBLY (TUNING CONDENSER MAX. CAPACITY CZ OSC. 110-120 VOLTS IN Iti POSIT! ON.) ----a 12 S57 I.F T1 2nd 12SK7 LOOP TWO TVRNS IF T2 I \2SQ7 35Z5 IF PEAK 456 ANTENNA KC SPRING ALIGNMENT The chassis must be removed from the cabinet in order to align this receiver. Connect the output meter across the voice coil. Connect the signal generator to the standard Hazeltine Loop Model 1150, and couple loosely to the receiver loop. Set the receiver volume control at maximum. The tuning condenser plates should be fully meshed when the dial pointer is at the index mark at the low frequency end of the dial. The signal generator.output should at all times be just sufficient to obtain a minimum deflection on the output meter. Set the signal generator to 456 Kc and adjust the i -f trimmers for maximum meter deflection in the following sequence: L4, L3, L2, L1. Set the generator and receiver to 1600 Kc and adjust the oscillator trimmer C4 for maximum output. Set the generator and receiver to 1400 Kc and adjust the loop trimmer C3 for maximum output. D -C VOLTAGE TUBE PIN VTVa 20,000 nh21R PLR VOLT D -C VOLTAGE RESISTANCE 1000 ONNS PER VOLT TUBE PIN 4 12SA7 1 2 3 4 5 5 6 e 8 7 8 1 2 3 4 125(37 ©John +80 +80 -6 0 0 -1 0 0 0 -1 0 6 1:.SC:' 0 0 0 0 +80 +80 -5.6 0 0 +80 +80 -2.6 0 0 0 -0.4 -0.4 0 0 0 0 0 0 0 -U.4 -0.4 n 0 .80 .80 +78 o 0 0 +80 +80 +78 0 0 0 2 -1.2 -0.8 -0.5 3 0 0 0 1 F. 0 E 29 6 5,000,000 5,000,000 19,000 7 8 50L6 1 VTV1( -1 -0.7 +54 20,000 01459 PER VOLT -0.45 -0.5 +48 1000 0N1í3 PER VOLT -0.4 5,000,000 -0.2 500,00L +42 5,000,UOC 0 0 0 0 0 0 15 0 0 0 0 0 40 0 2 0 0 0 40 3 5,000.000 4 +125 +80 +120 .80 +120 +80 0 5 0 U 0 16 6 7 0 8 +5.2 0 0 .5 0 0 .5 0 5,000,000 0 5,000,000 3525 26 5,000,000 0 1 0 0 0 2 0 0 3 4 0 0 0 0 U 0 0 0 0 1(J,Ú00,000 5 0 7 C 3 130 Rider www.americanradiohistory.com 13 RESISTANCE 0 n G 0 125 0 0 o 1.^fi 5,000,000 5,000,000 450,000 INFINITE 90 140 INFINIT.^. 120 120 INFINITE 120 120 90 5,000.000 PAGE 17-2 GEN IMP MODI. ]A5 GENERAL IMPLEM 2ND. I.F CONVERTER L2 C7 1ST. I.F. -R9 R8 50L6 A.F. OUTPUT I. F. T1 R2 RECTIFIER iST.AUD10. TDETECTOR-AVC. RS 12 SK7 SEC_ 3525 12507 T2 R3 12SA7 RP. R.10 C11 FRONT TUNING SHAFT C9 ON-OFF SWITCH R1 C12 R7 VOLUME CS R4 C6 C10 CHASSIS BOTTOM VIEW T4 --X4ySKC 100 AT R6 CONTROL X 0.6 AT 455 AC X 100 X AT 455 AC AT 40 400 125K7 C13 X AT 400, APPROLn7AIR GAIR PER STAGE DATA SOL6 n ]OOdaC INPUT ecru'. 3 VAXIRO GAIN PER STAGE GEA3URENENT3, CIRCUIT RAS OPENED AT POINT X TO 3TOP AYC ACTIN, AND A 0 -VOLT BATTERY COIIRECTSD BITREER THIS POINT AND GROOM. ©John F. Rider www.americanradiohistory.com GEN TELEV PAGE 17-1 GENERAL TELEV. RADIO CORP. & MODELS 20A3A21! ?0A3P r 0-Z2f0M-P o o - o d o ó0 -1 u* O > i U O O h N N J LIVM Z/i WHO o 09, î¢ 004 WHO 000 '00 £00' i 0 No E 0414093Yi 2i1 To o wNo93w Z/i o o WH093Y1 9 ¢ o O á \;;'ha bo O -/ww. WH0931I 2/1 b-01'ON löVd $NVdl d3MOd 0 ---11(O O a ©John F. Rider RECORD CHANGLR: www.americanradiohistory.com _ U U '3 Q N O > O N J= o Ceeïitmg Modal KJ RCD. H. 15-2 PAGE MODEL GEN TELEV 26B5 GENERAL 17-2 TELEV. AND RADIO CORP. > h a0 ÑZ a` M 1 m Ó > z W) WWI 1 ^2 á m o o 1 u xd-r In8 o o o2 o o da xg g 'T N § o r311-41 ® No 4 Ñ i ñJ0 HHHHm O º Ñ s n MIL) r. 1. _. ell: o n tJ' ó M N. J N K g 1 Xp- I 1 1 8 ©John F. Rider www.americanradiohistory.com GEN TELEV PAGE GENERAL TELEV. AND RADIO CORP. 17-3 MODEL 2635 LOOP '_ CS I R2 R3 R4 OSC. C01 L C6 R5 R6 C7 d,2><52\ R7 C15 'i R9RIO C14- ON-OFF SW. YOL.CONT. RI R8 \J C16 RII CII (E SPEAKER ALIGNìrïENT The chassis is removed from the cabinet in order to align this receiver. Connect the output meter across the voice coil. Connect the signal generator to the standard Hazeltine loop, Model 1150, and couple loosely to the receiver The tuning condenser plates loop. Set the receiver volume control to maximum. should be fully meshed when the dial pointer is at the index mark at the low frequency end of the dial. The signal generator output should be sufficient to give a readable deflection on the output meter. Adjust the I.F. tuning slugs, L4, L3, L2, Set the signal generator to 455 kc. Set the signal generator and L1, for maximum output on the output meter. receiver to 1600 kc and adjust the oscillator trimmer C4 for maximum output. Set the signal generator and receiver to 1400 kc and adjust R.F. trimmer C3 for maximum output. John F. Rider www.americanradiohistory.com PAGE 17-4 GEN TELEV MODEL 26B5 GENERAL TELEV. AND RADIO CORP. GENERAL TELEVISION 20,000 TUBE PIN IR5 1 Cony 2 3 VTVM 0 105 44 P.V. MODEL 26B5 1,000 P.V. RESISTANCE 0 0 0 105 44 105 Over Over 0 0 0 1.7 1.7 3.3 105 105 0.1 3.6 3.3 3.3 105 105 3.6 3.3 22n... 6 3.3 105 105 0.6 3.6 3.3 7 5 5 5 34_rt.. IS5 Dot. AVC 1 1.7 1.7 1.7 2 0 0 0 Audio Amp 3 1.2 23 0.2 20 0 46 1.1 3.3 42 0 12 0 3.3 3.3 4 5 6 7 -5 0 0 1.7 -2.6 megs megs 5 42 0 0 5 100 K 0 5.5 megs 12 -nL IU4 I.?. Amp l 1 2 3 4 5 4 5 6 7 22 ri - Over Over megs megs 5.5 mega 0 12 12_ 0 1.7 megs 5.5 megs 3 Over 22 1l_ 1 5 5 5 32 2 4 100 105 105 100 105 105 100 105 105 Over Over Over 5 - - - 0 0 0 7 8 8 8 1 0 0 0 2 AC AC 135 AC 105 AC AC 135 AC 105 AC AC 135 AC 105 4 5 -1-2-- megs megs megs 5 5 5 - 6 3 megs 5 8 melts 3V4 117Z6 Rect 5 34-n- Audio Output 3 5 meg 1 52 -/1_ 0 235_n_ 240_n_. Over 5 megs 240 _-Over 5 megs 7 0 0 0 0 8 120 120 120 Over 5 megs All values are positive unless indicated otherwise. ©John F. Rider www.americanradiohistory.com GILFILLAN PAGE GILFILLAN BROS., INC. O. O 'MODEL yQOWlI Z r J XaZâppWQ¢= Vr00rOJ1pN 7J,1 7=Z,..' -p78 W OO W O 8._.!_,,i ((WW.ii g W _W 2 G W a W W J~7 8m n p x .>E. x< 1 J 7 z W a:-rsW7W << < Z W W8 Q u. 8 Áj O V W 0 S O 0 -0>i W> + Y U1yI a W W 3 U W a tou X N X a 3 , . "a2'8:. pp OO O a 0 - < r X u . z w W m -< z 7 a r Z< LL 3 W00 ¢00.n7 <'. = 2 -«2Ö -8=..:2.--'-'2-u° 07íu `Le/!laliCíSK °r GILFILLAN 17-2 GILFILLAN BROS., INC. 1i011r;L 68F DET. AVC 1 CI I .F. CONV. EPEEN 128E6 AN T LEAD . AUDIO 124T6 C3 RI W 46 128 22. C2-'1 13T 50 C` 100 =20i ÌGc CT 00 L 3.30C¡ 171., ICO MM{ 48 8 200v L- MME V500K vOL.CONT. r Co .05 AM 143 2.24 T700v Z Cf. 8+ C15 RIO BAND-SWITCH SHOWN 220. 25 -.2 POSITION. ST BROADCAST BAND AT 1 141 AUDIO 12416 SUPERREGENERATOR }12417 KIT 214 D BAND -SWITCH SHOWN AT 2ND POSITION. F-M BAND 150K M c 2a SV1TCM .0015 TO FILAMENT RII' 1001( STRING C25 10444 C27 N` 05 rC25 x -.12477 c IF--+ 02 soo A ©John F. rL CfvICN SI RED ANT LEAD C 15 .25 200v RIO 2 20 .iF w Rider www.americanradiohistory.com 500K vol K 00141 GILFILLAN PAGE GILFILLAN BROS., INC. 17-3r4 0:C- MODEL KT BUILT IN ANO ONNNEC CO T OUSIDDE n FM ANT FOI IMPROVED FM RECEPTION. INPUT IMPEDANCE 300 HMS. 27K FM PLATE .03 COIL SUET IN i-^ 6SF7 T2 -T3 455RC 470K 2311LSTSL II AM 613E6 rim I I _if Z bcD r],'-/I TI I 1 , I 714 31( TOS a al I -O g a ¡. .2 I2"PM SPEAKER i I .02 OOI I 47K T00 L-- - J r 2.2 AM ANC MEG 22K 220R TEST POINT 22K MOb I SEMI- F br il005 500M TOME CONTROL. LTA G L T-t-VC Y20M 66.6 240 230 470K 001 6AL5 66.61___ FN SISAL MAN .ALAI 30 MONO. ^ce I 666 SL3 L 1000 AM PAO -VVVV\F-- 206670 90á ON '5 ,95 _/ 220 ÓMIDU. 100 .._9 _._.'FY 1215 90 22Ó 65X111/,19 48 PHONO FIP Y0 e5 /5165- 6C4 712V ] ING S ME TEST Fr AVC 1.05 POINT b R Y'-XEENFM_AA ~ IF 6+YN161 625e25 F D[T iota. lo,) 2102401235 105.10 1MR.AMP. AfICVE VOLTAGES MEASURED MTN D CNN PEN VOLT VO TINE TER, CHASSIS 6NOURD. 1C,00C IO.7YC TC ,00/ 10.7 MC AM - TRANSFORMER HIGH VOLTAGE SECONDAIT IS 540 VA .C. CENTER TAPPED MEASURED UNDER LOAD WITH IOC[ OGA PER VOLT, AC VOL, NE TOR POWER SL SEL.TIEO2 ASST. TEILBAND SPE MEASURED AT MECUM) 47M 110 MILLIAMPERES ,CwEP PANSFOPMEP SECGNOAPT LOACEC AC 6'LTAGE, S APPRO. UN- 620 VOLTS 56 MEBSTER RATIO OCT T(!T POINT -001 CIYNGER. F-117 V.A.C. SO CYCLES. "m46r.sE SWITCH ON VOL.COITIOL - .0e MOMO MOTOR PUYS. o E011O OE ASPS TS -47 40 -L FIL. T 4 rRTEIOCÑ. 1, rt`;ii7n ALIGNMENT 1A6 CHOKE. IN FM LP ST SEL. FIL. CHORE 16-47 `f K7 O G.3 VJAG 0 324110/ :I AIOO P VlA1/TF VLT` [/2N PM 6C4 OSCILLATOR TS -47 -SAM AVM Li NId10 ``E`OET/I E NOTE NOTE;C6= 3 GANG VAHABLE CA. 3 ALL CONDENSERS UNLESS NOTED STPASSES ARE 005 UFO TOP -PROSY 15 THAN 001 MED mmfd AR SE SA ED AN LJI MI/ 7; WITH per section SHOWN IN A fY FY POSITION I NC REAL INTO 66E6 GRID OSC.LLATON CURE MANNED VOLTAGE 4 SL .2 3,4,5 ION MAXIMUM NEGATIVE AT TEST POINT T GATED OUTPUT OF SIGNAL GERM SIIOJL2 GE SET, FOR FINAL PLASMA, SO THAT An v0. TAGE DUES NOT EXCEED -1. 5 VOLTS FOG 0 DC VOLTAGE MALANG( AT TEST POINT 3,A0JUST Z SWITCH VOLTMETER FROM RUS TO MINUS VOLTS AND CHECK FOP 0 VOLTAGE IN EACH POSITION 485mmfd per section " SMALLER ,ALL FILAMENT PROCEDURE. MODULATED 455 MC SIGNAL INTO AM LOOP PLUG TERMINALS ALIGN FIRST 6 SECOND AE IF TRANSFORMERS, Y ADJUST INS CO, CIO, CII,AND C12, FOR MAXIMUM, NEGATIVE, AVC VOLTAGE AS INDCA TEL ON A VACUUM TUSE VOLTMETER (VOLTOHMYDT)CONNECTED AT TEST POINT X ADJUST TRAP TRIMMER CS FOR MINIMUM VOLTAGE MAKE CERTAIN POINTER IS LINED UP WITH TRIANGLE ON DAL AT LEFT END OF POINTEN TRAVEL 4 SET POINTEN AT 1500MC. CONNECT OUTPUT OF SIGNAL GEN TO A TWO T,;RN LOOP AND RADIATE A MODULATED 15000C SIGNAL 1OTO 111E AN LOOP FROM A DISTANCE Of AT LEAST 12' TRIMMER ADJUST OSCILLATOR CT UNTIL SIGNAL IS NEARO AOJUSr RF AND ANT TRIMMERS C2 AND C4 FOR NAAIMIM AVC VOLTAGE SET POINTER AND GENERATOR AT SOOKC AND ADJUST CS AM OSCILLATOR PAO, UNTIL SIGNAL IS MEARO AND ADJUST CN FOR MAX AVC VOLTAGE. GANG E ROCS AT RECHECK OSC TRIMMER CT 150040 ED MNPD - SL 4:REPLACE A 10rC CIISSIS, Z ADJUST G TUSE AND SET POINTER' TO 101 IC FEED Fr ANT TERMINALS ON SACK OF S'GNAL INTO SERIES WITH A 270 OHI RESISTOR YAMMER UNTIL SIGNAL IS HEARD. ANT- RF TRIMMERS CI. CS FOR MAXIMUM AVG OSC IN OSC ADJUST C VOLTAS(. 7;R(CN(CK ©John F. RECORD Rider www.americanradiohistory.com C6,CI,CS FOR WAX. CNAS,GEtt: AVG VOLTAGE. ,abster Model 56, RCD. CR. 15-10 I% GILFILLAN PAGE 17-516 GILFILLAN BROS., INC. MODEL 108CLM s á ©John F. Rider ecltenatird GILFILLAN PAGE GILFILLAN BROS., INC. »LT OFXONNECT AND FOR »VT IN FY ANT COMECT OUTfOE FY MT INPIIWEO FN RECEPTION MTENRA FN IN I1 S00SINR IMPEDANCE »LT 17-7,8 MODEL 118C 2,4 V II - " ^" ^t^T^R v if, ^..., --- r__ra n.« T3 .DE NG STS« St 00 ONO OC. E PSI SPSYIER. O W AVC TEST POSET. r 6B A6 - IN , _6AL5 !TOM MOTOR ST. SS1. TERIQ NOW. SS NOR. «LEM» SaPE (SPECIAL) RATEO TWIT PLUS IMPORTANT ; FOR 50 CYCLE USE, REPLACE MOTOR DRIVE SWIFT MITN GEN. INDUSTRIES. 50 CYCLE BUSDNG. «T. PONT. 4TR C'o 117 VOLTS CYCLES VO. . 001 ... It......AM»OR 1p To.r TS 17 "not AN b4-3 V. A .C. 0 3.0 SSF7 ANPS FS r T 0I00I00 00 AY 4SSRC »M IC I NOTE /MAI« READINGS VOLTAGE COMIC OUTPUT OF GENENATON TO 1300 R C. 1900 LC LOOP AND RADAR A MMODILATIO LEAST AM LOOP PROS A ON TACE OF AT TUN ML M OM AL INTO 12' DART OSCILLATOR DIUST 1700 111357 FILAMENT REPASS« AME. 000 SI MEAL NI TO AM LOOP PLUS IL PEED ONO M LE TNMSPMMENS, TERMINALS. ALIGN FREEST N ST ADJUSTINS C11,C0,CII MO Cit. POR MARCMIM, (LSAT IVO TILE VOLTMETER VC VOLTAI M NIDIC AMC M O VACUUM CONNECTED AT TEST POINT ADJUST TRY TISIMES C3 FOR MINIMUM VOLTAI. ON RITH NADE CERTAIN POINTER IS LINED DP OAl 1y LEFT END OF POINTER TRAVEL TOSO v PROCEDURE. ALIGNMENT A ó FEE ALL T'CANTER V ST.S«. -e 0 IONPD 001 LAMPS (f)_ l o. T TRAMER CT MOL NMAL LOOP AND DI TRIMMER CO D C1 FOR VOLTAGE SET PUNTER N CS 3 GANG VARIABLE CA 3 GANG camellias VARIABLE 485 mold IS mote SOLLLG MAN 001 MO AI SHOWN per section per 'action. IS NODO. UNLESS NOTED INN. «OMNI , -ATISOVVY 00110 J1 o SEASIDE NO`E NEC POWER NISFIPUS 6210, UNLOADED SEC OMOARY IS. 64C VAC NM IME)ATOE AT 5000 C MD ADMIT AM »MAL N REMA LLATON IRO C' SAIN MD ADJUST CS FOR MAXIM« ATt VOLTANE. LI RECHECK OSC IT UN »NM CT AT 15000C. FN MNDSMERN TO PO ED POSITION. TIM OSCLLATOR )INNND7) WITHMEKO1 AT L-1,2,3,,50 POP IIITO «ROVEED TUNENAL «X *mad MC VOLTAI ADJUST MDCATI0 T 4 MONK ATOR OUTPUT, FOR ANAL PONT Y APRIL SHOULD St SET s0 THAT AVC VOLTOSI 00E1 1.6 VOLTS NESATIVE NOT ESC110 T TE S7 IL FOIL 0 DC VOLTAI «LANCE AT TEST ADJUST PONT 2 SMT CH YTAO MON PLUS TO INN« VOLTS AIM CMG« PON 0 VOLTAGE N ROCH ONITI ON. PONTER TO IOSSO. AND OSCILLATOR RIM REPLACE TIRNIIALS,M FRED A MOD ION NC MORAL INTD PN MT 070 DM IEESISTOR. MUM. IN SCANS *TO ADJUST 011C TONNER CS woe »NM IS MIAMI. EOM EWLM« INC T111NNEMS CI,CS -RF ANT ADJUST IT PONES TOANRCRITEU NISH VOLTANE SECONDARY IS 000 VAC CEARA TYRO REASONED IAIISCR LOAD0/ONLLS) VIT.. FOR MAI AVC VOLTAI. 1000 DIM MOR Ac VOLTASE FORMER - NO 621 O -ITS MLL VOLTAI REOEOL CI, CS, AND CS MOVEOC VOLTAIS MEASURED TON TO 20,000 OW RA VOLT CIEMSM «ONO HAIR« WAVE 3 TO RP - VOLT METED Is FOR TRANS- POWER TRAME NUI 105 VOLTASES OM TO AT RIO MILL LOAD LOOSER 3/00 AC D3 SAC TOP- MONT ©John F. RECORD ChAÑGER: Rider www.americanradiohistory.com GEN. IIdD. Model 130, RCD. CH. 17-1 xx GILFILLAN PAGE 17-9,10 MODEL 118C -M sc`lPAflaticA, ir GILFILLAN BROS., INC. o Q99 0 -Trör I 1 L - m --J' a --ANA/NA tr co ©John F. Rider GOODRICH PAGE TH1 B. F. GOODRICH COMPANY IA7 IST. DET OSC i R743-W MODEL 305 IH5 1N5 AMP 17-1 2NDDETAVC d 1ST. AUD. POWER OUTPUT F. 2 LI C14 "--i C3 i C2 CI T CC 4 LS a13o63 RFC On Ct3 -+ RI2 JV-+ ONO. LEAD NEW BATTEN+ 8W2 e-' OLD BATTERY RII 1F.455 \SWI KC RANGE535 TO 1630 \ KC- \ 8B+90 VOLTS BATTERY PLUG (Top View) ALIGNMENT PROCEDURE TUNING CONTROL IMPORTANT-Check to see that dial pointer reaches each end of dial scale when Station Selector Control is turned from one end to the other. Volume control --Maximum for all adjustments. Connect radio chassis to ground post of signal generator with a short heavy lead. Connect dummy antenna value in series with generator output lead, when needed (see below). Connect output meter across voice coil of speaker. Allow chassis and signal generator to warm up for several minutes. Band Signal Generatorr VOLUME CONTROL 80N n E SPEAKER OO IA7 GT ) ECONOMIZER SW.TGM SOCKET, INS\ C((ì D7 A(1°(I115 B I 305 USEU GT N II/2 V ANTENNA BATTERY CABLE A. BATTERY 90 VB BATTERY BLACK -GROUND Use lowest Output setting of Signal Generator capable of producing adequate Output Meter indication and then proceed as indicated in the chart below. Connecticut to Radio Receiver Dial Setting Trimmers Adjusted (In Order Shown) Trimmer Function Type of Adjustment 455 KC. .1 MFD. Grid of IA7 (Cap) High frequency end of dial A -B-2nd I.F. Output 455 KC. .1 MFD. Grid of 1A7 (Cap) High frequency end of dial C-D--lst I.F. Input Adjust to maximum output Adjust to maximum output .0002 Antenna F I. F. 1630 KC. BROAD- CAST 1300 SC. MFD lead High frequency end of dial .0002 MFD. Antenna Lead 1300 KC. E--(See note below) F-(See note below) G H I.F. Oscillator Antenna Oscillator Antenna NOTE: Before adjusting trimmers "E" and "F", make sure that each iron core is 11.4e" or mare outside of its coil form. If necessary, turn adjustments "G" and "H" to accomplish this. F. ` G° Dummy Antenna F ©John OFF SWITCH F Rider www.americanradiohistory.com Adjust to maximum output Adjust to maximum output PAGE 17-2 GOODRICH 8743-W MODEL THE B. F. GOODRICH COMPANY the antenna to the "colored" lead and the ground to the POWER SUPPLY This receiver is designed to operate on a single unit Ensign AB48, Ray -O -Vac No. AB -82, Burgess 17G -D60, Eveready 748, Bond 0528 or General 60DL-11L Battery. No other batteries are required as this battery is a combination 90 volt "B" battery and a I1/2 volt "A" battery. The life of this battery is approximately 750 hours. The "A" and "B" sections are so proportioned that equal life may be expected from both. The "A" section will give satisfactory performance as low as 1.2 volts and the "B" section as low as 68 volts. This battery life may be expected with an average usage of several hours daily. If the reception becomes weak when the Economizer Switch is in the "USED" position, a new battery should be installed. A battery compartment is provided in the rear of the cabinet, and the battery cable simply plugs into the battery. ANTENNA Use a standard outside antenna whose length, including the lead-in, is at least 50 feet. There are two leads extending from the rear of the chassis at the left hand side. Connect VOLTAGE DATA "black" lead. GROUND IT IS NECESARY THAT A GOOD GROUND BE EMPLOYED WITH THIS TYPE OF RECEIVER. Water pipes make a very desirable ground connection. The ground wire is to be connected to the "black" lead at the rear of the chassis. All connections must be tight and clean. ECONOMIZER SWITCH The battery Economizer Switch is located on the top of the chassis, right side (see figure on last page of this instruction folder or model label on chassis). ALWAYS HAVE THIS ECONOMIZER SWITCH IN THE "NEW" BATTERY POSITION WHEN THE RADIO IS NEW OR AFTER A NEW BATTERY HAS BEEN INSTALLED. When the volume or tone of stations decreases noticeably (after 200 or 300 hours of actual use), this switch should be pushed forward to the "USED" battery position. POINTER SETTINGS AND DIAL CORD STRINGING All readings made between tube socket terminals and chassis. Voltages indicated have been obtained using a Vacuum Tube Voltmeter. A second voltage reading is shown made with a 1000 ohm -per -volt meter, when use of this instrument would result in appreciably lower readings. The voltages were measured using a fresh battery, volume control full on, dial at the high frequency end, and no signal. VOLTAGE CHART BOTTOM VIEW IATOT IN60T s0v 600 KG. SETTING INDICATED ST MARKING ON POINTER SLIDE SCALE 1300 KG. SETTING INDICATED ST MARKING ON POINTER SLIDE 1000Nv POINTER EXTREMES INDICATED NY MARKINGS ON POINTER SLIDE NOTE:BACK DIAL AT LOW FREQUENCY ENO (IRON CORES FULLY IN COILS) 63"OF DIAL CORD REQUIRED CHASSIS OF REPLACEMENT PARTS CONDENSERS Description Part No. Pape:, .01 mid., 400 V 64B1-25 C2 ........ ...... ..... Mica, .0008 mid. ±10%n 65B5-31 C3 Trimmer, Antenna j 66A10.1 C4 Trimmer, Oscillator J -"" C5 _.. Mica, .0001 mfd. ±20% 65B7-17 C6 Mica, .0008 mfd. -}10% 65B5-31 C7 Paper, .01 mfd.. 400 V 64B1-25 C8 Paper, .002 mfd.. 600 V 64B1.14 C9 .... Elect., 4 mfd., 150 V 67A4-2 CIO Paper, .05 mfd., 200 V 64B1.32 C11 Mica, .00025 mfd. ±20Ví 65137.22 C12..._ __ .. Mica, .00025 mfd. ±20% 65B7-22 C13 Paper, .01 mid., 400 V 64B1-25 C14 _ Paper, .01 mid., 400 V.___ ..... ............ .64131-25 C 15 Paper, .005 mid., 600 V 64B1-12 Symbol CI . _ C16_ C17 . . .. _ Paper, Paper, .01 mfd., 400 V .01 mid., 400 V 64B1.25 64ßl-25 RESISTORS RI R2 R3 _ 114 . R5 .. R6.. _ R7. R8.... .. R9. R1 ...... . RIC... 1 . ..15,000 ohm ±10%, '/zW 60B8.153 470,000 ohm ±10%, 1/4W.......... .. 60B2-474 ....220,000 ohm ±10%, 1/2W 60B8-224 33,000 ohm ±10%, 1W â0B8-333 ..4,700.000 ohm ±10%, 1W 60132-475 ..2,200,000 ohm ±10%, 'hW 60B2-225 megohm Volume Control & Switch....75B1-1 1 4,700,000 ohm ±10%, r/aW 60B2á75 1,000,000 ohm ±10%, t/aW 60B2-105 _1,000,000 ohm ±10%, t/aW 60ß2-105 ._ __ .390 ohm ±10';6, _ 1112 1,'4W ..._0.75 ohm ±1070, 1/2W. (Wire) 2200 ohm ±10%, t/aW _ R13 60B2-391 61A2.1 60B2-222 TRANSFORMERS AND COILS Antenna Coil ...Oscillator Coil .....1st I.F. Transformer ..2nd I.F. Transformer LI L2 L3 _ 1.4 1.5 _. Ti ©John F. . Choke Coil (RF) Output Transformer _. _..AC105-1 A1020 72B5 72B6 AB103-1 98A5 MISCELLANEOUS Description Background, Dial Part No. X22C5-1 Cabinet, R743 -W.. Cable, Battery (complete with plug) Cap, Grid ..34D10 Clip, Baffle Mounting... Clip, Dial Glass Cord, Dial (5" on tuner and 63" on dial drive) Dial Scale, glass Drum and Hub, Tuning .A1026 .90A1.2 2B10-21-68 18A2 _50A1-3 21B25-2 . ...... ...A1035 Escutcheon 23A8-1 71B1.3 7181-4 33A7-2 88A4-4 25A9-1 17A1-3 27A4 28A1-1 A1040 .._87A8 87A5.1 87A4-3 Iron Slug, with wire (Oscillator). Iron Slug, with wire (Antenna) Knob Plug, Battery, 5 Prong Pointer, Dial Pulley, Fibre Dial .. ...._ .. __ Screw Studs (for iron cores), Shaft, Tuning Shaft and Pulley (Tuner). _. Shield, Tube Socket, Octal Tube Socket, Speaker Speaker and Output Transformer Spring, Spring. Spring, Spring, Spring. Spring, Switch. ..............78815-2 Dial Drum Cord Tension. Hairpin (To hold Ant. or Osc. coin__ Tuner Slide Cord Tension Tuner, back bearing takeup Tuner, front bearing takeup Tuner Slide Pressure ...... .. . _. __..__ 19B1.7 19A3-1 19B1.8 19A6 19A5 1ßA9 _ . . SPST (Economizer) SW2 Washer, C Washer, spring (coils) Washer, spring (shaft) ... Rider www.americanradiohistory.com 77131-6 : . 4A4-1 4A6-12-0 _.4A6.3.0 GOODRICH PAGE THE MODEL R75152 GOODRICH COMPANY B. F. 17-3 -U-A00.9 01-d 6-d 'lJOSi LdwNI ;2 N LL VWOZZ 1 +rWo0I 6-a L -!I _ ó1+- UNT b 02 U 93WA 8'9 9-8_ A A > T"- 1 \ ó ci u93W £'£ b vw r Oos s -a Hv)e1 zl Iw UWLb LL N F-r,.QQ4 4 mr o ' KO çl ml rn cN O O O O ol L----- ----- 1 M > z _z¿ LL O .1 172101e44OQQr+ (04.J I ) - o IH z U i I n W ©John F. Rider RECOli.D CÜFHdGER: www.americanradiohistory.com Detrola Model 7000, ROD. CH. 17-14 PAGE 17-4 GOODRICH 1T_ODEL R75152 THE B. F. GOODRICH COMPANY N.co+,c, aOi'áó IJMO Eboo í, O .1:1 E .0 . s°,y gg ó g41/0 S. o °. :' rzn a 0 a ºeH vg p= 4; r MS 10 U p d .e , ° 4-0 °1 C/) MM OF C> IO Ó Úd ^o O,t J] rowN O m. y rn .-. .>~ c ÿ. . a) O F, CU +, O N a/ E M° E .b i, .-i F. W rA Nw-1 al ,) s0, F+ Ú n. O 03 a a v1 O ^C i á R. t0 W Ú + o O '-; Cd ó' s`d. 5.., I, ai 50 s~ Z w Áz a oo N dV +, F. 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MMeNC+MMNONO4eMMerOON:J 000000.-.N00OONNM00OO O. -I .r N O M c.." a d a W N N W W....-1.r...-Id000ONNNNt-ICCO00O^' ., O.1,-, B k z pO 7 CD 3 3 3 E Ép 1..1 7>> o á óóóóóóócov éO .ig.c O 4 .. N ÿ e er á. a7 .Q v e .-. D --ci wv.ti .dTj vtiw 'CS b0 er, er eM eM d. O O O- N N N N CO 00 00 000000M000000 L CO N00 00 O NNNNO nt` NNNNNN !A n If e Ii Ib (j Ci eN eM eN O Y+1 .-I 0 00 00 888888 Nd' 0 o G '3 o 1-1 i- D D ce m w .. eM COCO icaa,aa1ßiaaU1 +, A. Z CO ..r..I.N.er .1,-1.11 wd H F. ,+ o4=owaaoaoqwoomxPaaaa R U b0 ©John N e1'et'ONy eN[ U1 R. E Ó 4-1 R W CC ócaU io ai R ~cd óó'óº.'ó.,Caa'óc^ycaaó C +a R C7 tti b0 i+ Z7 tw _N A PZ ú yab aAv óvO N.1.-1O.. ¿ íYi zO ,Z 1-,p2 ir 76 O0 0N + E ^ ... ,.i T. mm w z R. ..ci C/a1OLI FF âÿ ó áaa °Aá .. F.ºÄ t°.r°.3º.órc°.s`°. + v I s CI) a bay C7C7v1v10.1UFF0UUv1n1ß.v1UUWÛUUU * t. C,Ñ-i* ,, i, e'sCsCó°a°a.;aüa .n b..°a d . o w N N E FA A + ,c2=ü O ..,°.0 N aiayi.w°Op.ÑUHÑ d z S óc. 0o ó? ô a o A o -e c tn Q a) m.0 v Ñ e = E. c., 4-1 a> C°j ' ÿ i o z O GN , m WMd E r °'páC) VE p C Ú .. ' N +.F" bDFKe zW Z 1 3oW º a F M o o E+ w G. G. t- GOODRICH PAGE MODEL THE B. F: 17-5 R75152 GOODRICH COMPANY SOCKET VOLTAGES POSITION TUBE 12BA6 Converter I.F. Amplifier 12AT6 2nd 12BE6 DET.-1st AF-AVC 1 2 3 4 5 6 7 -5 0 24 AC 12 AC 88 88 0 0 0 24 AC 35 AC 88 88 0.7 0 0 12 AC 0 0 0 12 50B5 Power Output 0 5 85 AC 35 AC 115 88 0 35W4 Rectifier 0 0 85 AC 117 AC 112 AC 112 AC 122 NOTE: All DC voltages measured with a 1000 ohm -per -volt meter from ON-OFF switch (-B) to socket contact indicated. All AC voltages are measured from ON-OFF switch (-B) to socket contact indicated. All voltages are positive DC unless otherwise marked. Volume Control full on. No signal input. Line voltage 117 volts AC. . . RED MID. o AR f)óó) . l»_ r`JKV BLUE BLALK ,i . N ' ->e et %' n '_'``1 u: CAP 02 pO Ora ID ID ge sze Parts Layout-Factory Model 7156-15 LOOP ANTENNA TRIMMER C-2 (LOCATED IN BACK OF CABINET) AC LINE CORD PHONO POWER CORO 2mIF TRANS. wes¡ I. I F TRANS. ems RADIO -PHONO SWITCH STATION Dial Mechanism T..as2 ©John F. Rider www.americanradiohistory.com SELECTOR ON-OFF SWITCH 1 TONE CONTROL VOLUME CONTROL Layout PAGE 17-6 GOODRICH MODEL 75434 THE s§ § GOODRICH COMPANY B. F. e e § §§¢ $ H O O01! em OÑiO.O~fSO..OSOpH(.,N0.08000(.a., - :S NL1 t f 1? O O mtD m O O N O O O N O O §E .- 0 Z H O0 O m 0 t H H M O á :g Q O O u` 1 ..N0*N O O a a No O I to v1 OS 000 cO i 1 K ZO70 N O, Z Y~Z f.. ~i~~ I 'iÌ 000N$OOO v>OOO h. v, O 1n we Va O O 0 1 1 1 O oO o) +: 0000 N00000U] 00 00 000 ftCC H 1-0O.-1NH? W 01t`gHN19 <,1010t m.-1N17<,N10 t` m. -1N r M 000 e : N 00 e 'Z'SOHOO C1 1g f. N IV ±¡ O i 1 ZUOÑÑ O N O N N 0 0 0 0 0 Oro O O O N 0 0 0 0 0 0 0 0 N 0 00 M 0oSO0Omo0O000$O< O OfJ M; a' lli 0n z C o ;b O .-1 7 +) O s ò á o e a) E>2 a r -I r -I r'4 O > r--1 U a) Qr .-4 {J V Q7 a) F. Qf a) .`-¡ ,--+ cÒ 1 U ri00 O ,-4 tfl ri r'+ csi N+ >ä A, O D r 2 [ fÑ ru a) F. 0 F. O Cri .-1 E 4-. 13 a) 4-+ .Z Ori O E U Q) m+-) G) r1 g F. Cr. CO + r+Eg 0 -i 4-,-1 C) ¡! Ña)Óa)paa '00Z> E F. 27 4 P O+-1 n Y-'(1) 0 o +-1 a) Q) 4. ri +) .+)a)+ ti°a > C U C slot - t tº m VWA.w> w1/Olwce, d) "- tr. R o0 ¡ x< N 3s" Ergy y - Y" -A4..i-. ~< M : R óVU 'e. $M2 . 1000 o< m w +) F. a) W° £ y F F. -/ E i-' e é E Q1 P. k a) vUi CrIa ° ° ' m Q) .[ i- CO) e a) U C Q) C a) 1-+ FO.I v C C O r-1 + ß W O .[ 00 0 F. rl-x+O a) C E...1 c ¡ F. O i e u 3 O a) y a) U O O C a) F. O Q) -x cd Fy Q! a) 4)Q E 1)4 e O O (' VD r-+ OC +-1 (fl O Q) E4- 4-1 a)1 41 Q> o a) ,-1 ,-+ ..-1 O in F. cò O () g3 Q) 00 4-) Q) +i ñ .L¡ O+) Cd 4.)y.) E O F. a) a) A, m i< E ór r u)U +-i 03 C GO KM áa u )Ó a) .r.. Oñ E >}< , Rider www.americanradiohistory.com '° a) --4E Ue C). Q) F. +) a) 4-) 'U OC a) r-1 +x O Qi Y) a Q.R7 > 4-. a) -I Op m ,-1 v) F, a) C +-i apOF.Ca) ÚÚ E1 >t o C t~ P. mEC O mC00+) ,-i +) F. ú F.+) a..C .rF.a)F. 4-)Qi C te C i-' a) O 1000 ©John F. Q) F.Ca)Cv'vF.+ O O o OG b (Ai r-1 t-1 r., +1 +) at 4a) 4-) Or 0) Q>O OO 1) a)U.-+C ri Q ó cd 4-) co +) e v) V i 1.4002 a) .0 Px i< G ái U a) Q) c.> ""ml A + .0 0 :Ñ o > w < 3qp$ W m ,--+ el, a) Cd Or'r{ O a) +-1 hC 1-1 N W 4-1 +) t -i U O a ° .-I VCº> oov . a Q) cdo 3 ov41 C cd 4-b Z Q) F. G-1 . a) O o3 +) C r O-1 (D (D F.+.) 0UF.4>0 m0 a)EOCOC) ,o-ICm'v+)1m Ce .t~ -7 v .Z O C O +)U Q! U a) p Q) U"-D cr) E+-)U 41 GOODRICH PAGE 17-7 MODEL 75434 THE GOODRICH COMPANY B. F. 12SQ7GT L3 12SA7GT DETECTOR -AVC. 1ST. AUDIO. SECONDARY CONVERTER RI c8 R4 L4 SECONDARY I. F. AMP. TI R5 C10 35Z5GT RECTIFIER R6 2ND. I.F. 12SK7GT 1ST. I.F. TRANSFORMER - -Cil TRANSFORMER - T2 LOOP ANTENNA SPEAKER OSCILLATOR TRANSFORMER OFF T4 C7 TUNING SHAFT FILTER -ON VOLUME CONTROL R3 C6 - R2 CHASSI S BOTTOM VIEW ©John F. C13 CONDENSER CS SWITCH Rider www.americanradiohistory.com C9 R750L6GT 2ND. AUDIO. OUTPUT R 9- PAGE 17-8 GOODRICH MODEL 76143 ©John F. THE B. F. GOODRICH COMPANY Rider www.americanradiohistory.com THE 4 B. F. GOODRICH COMPANY o «4 HU 1-1 la [7 FA . (¡cc P.U. U m e FW A hW52HIN CD F Z O OGZ E-It UN -,' OiH :F H5o 5 pol O O CD OaA Ñ W.- tn U ,. P.á >1 u) GOODRICH PAGE 17-9 MODEL 76143 . ~ CD E. m i äo> 0 áv) ów5zaiáw. ` waW á21ó OnE*. Z V-(r p3 E4 02 = F Err cu .aF CD E4 IM C NFO O d CO2 h~,ßt)Ug W H O P,-12 wv)wt44°4ár1: -á ¡¡ G >1 yefl: CD O F ZSCCx 12 P.FC.]2tZ aFU i. W2tix ) r- Nm O z W F Ú 2 HE. OCL'ó WÓ P J au F Úr-.0 F XaCO Ft to7 E. O -Z< g -1 2 i700 x0 '' ..4 H Z N F O O ffiU H WOIY. 0 v. I-.dCWWÿx n ó `D CG zeA OUxe FnV)WOu)V H E. Ch z U .4 Q [g un Z F N OC A ]a7W(h ña4 áH z Ó7 Z W WdM HFxO F wz rnn U ee gi s PC [il i [' 44'tä J a (il O OO O .+.--.-1 ÿ < > a. 8 U e e Ó0 «IO Ó 3 O U ó 060 x I `j O O MN 1 HN il O rn 000 O c U CO < m h U < 0 .. O U OIOÓ N N O O 7 1 a, I 1) 0 e 0<.-90 UN U I U O O 0 0 0 .-.4 4 1 I I 4 l O O u) 6 i 1 I ee I .i O N 0 f/ g µ1 CO e 000000 U<6U 1 O U"J J N N I O 0 0 1 0 O Ó I N F > ÓÓ e .... U 060OOID O'+ -+w0 U U U U U U O 6.=6 ti a<.-. 17 WW a u s a H -. ºe tG W. -I 3-+ ó W 1`Fá e O ce U S O )U O F U F . O S.. N V 7 0 0 0 1n 6 0 0 U < I CO U O I< e II .a0 U) CJ a W: U N Q o U U U U U U.M-. 1<<< I K 6< 1 I O Q u,O I I<.. I U s 6<« U U U U V U M 1 6 a-4. W S U z nC H F.. H 4 2O Y. O ¡2: 6 O ox 6U W F am o.. > i-4 .. N Ih e U) CO eäFr< CD m ©John .~.o F. N CO .. N Y) a r Q In t0 Na) H CM CO ec rCl ..N..: .N.O< c In t0 t--00 .. N Ih Q d-u t [W U CA U) ID ..i ICJ .N.6 Rider www.americanradiohistory.com !` CO .. ì N to e U) IO t` CO .+ N to Q U) tp N CO V) Nsi < U PAGE 17-10 GOODRICH MODEL R76162 THE B. F. GOODRICH COMPANY Ñ e 1)o eº r/VVV-, - ï NOLb ïl-a )I51 £1-a I 0 - T af LL O )IOLb Sla o93W8'9 II -8 á©9 u 00©< oY cr.O 2 N N o w > Q z W 93W8'9 8-a UU I- W Q x o 931N £'£ b -a (/) r- 4-8 MOOG d,e t_ --:Z-,-1 M) ó z o_ I- N O a o Q Q J Z z 3 o _ N 2 e z U I_ 3 cs) O z o2 m nf0 úO K N l , , --.i``i !` l 8b-O ó Q J(XXXXJÑ 41t, N - O 1 -- I 3 áW - -lf O ,ron oO p NOïZ LI -a I( ó ¢ X Z W ©John F. Rider www.americanradiohistory.com o z N THE B. F. GOODRICH COMPANY maeo+,> -4. 0.., Ñ c,a,.tyzbmo s. o O .Ly 2-Ow °,o'y..+r0+,0 a a 690 Ñ O F, F. Y cQa,á ba 0 vH ó U N > n, <1aoa:I H NoC9w C .cd..d CO 0 .b u2 Ñ ~ o. óóó O0 ^ N .. U OEHba 70i«QÿTaá . G O Q, Q) CR , QU w Orÿyr, z` o°qÿ. ',..)x ..o F.,...ó >, o-óó 2 yw.r e.G im W u d O o Ñ Á^ EE- .a © Á e z ó X T. O 7.4 4-> ,7a m - CO U 5 ä íor ÿ óZ O zÑ e 1i Fi y ae i m °v bD- ©John ~ I ed 2 ó ó F. - C, i p4 Q L).< d io o m co ,--i ,-i Q e\i ei x D, có <2< <Á 4 í7. E .1..> ó ó N Q -ci I ce ..e ó x f:4 +.) b x ., 03.e. ó R, Gz., A "ci Ú ? , -v ci.) t>0 W H N « w d oW.a, OAÿb 11ieóº Z E Er- :ñoa,°° ce r_ w -A CO 1-I ó "mt. ,~ F mtl Rider www.americanradiohistory.com GOODRICH PAGE 17-11 MODEL R76162 PAGE 17-12 GOODRICH MODEL R76162 THE LOCATED B. F. GOODRICH COMPANY IN RECORD CHANGER COMPARTMENT Parts Layout TUBE COMPLEMENT 1-12BE6 Converter tube 1-12BA6 IF Amplifier tube 1-12AT6 Detector-AVC--First Audio tube Symbol C-4 C-8 C-15 C-3 C-10, 11, Part No. E59413 -Y C57859-1 A2163 B55487-1 BC31B103 BD210503 BD41013 13 C-7 C-16, 17 C-1, 9 C-14 C-5 C-12 CH -1 L-2 L-1 R-5 R-14 BD410104 BD410203 BD410503 BD610302 BM74A101 BM74A471 B55823 B58635-1 B57842 C59420 B54466-2 B57841-1 C-59414 B57262-8 B58069-3 C59416-1 A55431 ©John F. 1-12AT6 Phase Inverter 2-35B5 Power Output tubes SERVICE PARTS LIST Symbol Part No. Cabinet B51524-5 Capacitor, Variable A58723 Cable, Dial B57857-1 Cap., Elect. 40-20-20 mfd., 150v. A9027 Cap., Mold. Paper .01 mfd., 400v. A58612 Cap., Paper .05 mfd., 200v. A58700 Cap., Paper .01 mfd., 400v. R-2 BR16B101 R-16 BRR16E101 Cap., Paper 0.1 mfd., 400v. R-13 BR16B153 Cap., Paper .02 mfd., 400v. R-12, 18 BR16B474 Cap., Paper .05 mfd., 400v. R-1 BR17B223 Cap., Paper .003 mfd., 600v. R-7, 9, BR17B224 Cap. Mica 100 mmf. 10, 17 C'ap., Mica 470 mmf. R-4 BR17B335 Garton, Complete R-15 BR17B474 Choke, Filter R-8, 11 BR17B685 Coil Assy., Osc. R-6 BR17E152 Coil Assy., Loop R-3 BR17E220 Control, Pot. 500 000 ohm, (V.C.) B57848-1 Control, Pot. & Sw. 500,000 ohm, B55440-1 (T.C.) SO -1 B59417-1 Crystal & Indicator, Dial SP -1 C59415 Cord, (A.C. Phono) C58711-1 Cord, Power SW -3 B51576-2 Knob, Magnifying Insert T-2 B56718-2 Lamp, Pilot, 7w., 120v. T-1 B56722-2 Description Rider www.americanradiohistory.com Description Lead Shielded Needle, Osmium Point Pointer, Dial Pulley, Idler Rectifier, Selenium Retainer, Dial Crystal Resistor, 100 ohm, Yaw. Resistor, 100 ohm, lw. Resistor, 15.000 ohm, Yaw. Resistor, 470,000 ohm, 1/3w. Resistor, 22,000 ohm, 1/aw. Resistor, 220,000 ohm, Yaw. Resistor, 3.3 megohm, 1/3w. Resistor, 470,000 ohm, 1/aw. Resistor, 6.8 megohm, Yaw. Resistor, 1,500 ohm, 1w. Resistor, 22 ohm, 1w. Shaft, Drive Socket, Dial Light Socket & Cable Assy. Speaker, 10 -inch PM Strip, Light Diffusing Switch, (Radio -Phono) Transformer Assy., 2nd IF Transformer Assy., 1st IF GOODRICH PAGE 17-13 THE B. F. GOODRICH COMPANY MODEL R76262 o Qª 4rAAA/Y ere e,o0 v ( )IOLb 31 -LI I )1S1 £1-23 93W,8'9 I I-21 UO 93wß 8-ii I( -ó oa U_00 93W £ i b -ö mg) )iOOs Ú Ó s -N V r- _ J \ -1\\ w o vi I Z i w r Z W_ U It Y P w O LL _ / I V V V o áLº'_ V á2 I J r1 1 I I O '9° 1 mN ñ > o m á M o p O K Ó g.") ;v o z 3 = S W Q á W F- aZ JQ J J W O H O O >O J V) Z 0 w f- O ui F oU)P"' U) Z U) JZ = O w W d Z M Z J O Q Q O E a O U) Q G O? Z U) !Y J I-X 3 m 3 Q 0 V) en 2U) á m W ZO a U ge f- O > N Z OW W W m F ~O > U 2O 2 Z Z Z 2 O O Q w w O wOc' Ir W CL U Q / l n) U ù U U XZ wa ©John F. Rider 2 JJ =Q(r)4 U)U 3 O N W Z O H F O O C I- F- w W OFZ Z O 00014"j ct U 2 Y W O4_1 JJ G Oo = (.13 i O W (f) Jo <:( U) W O> J > O O=a mQ J} a J O> O U U) U) O LLJZ O O cc< F-- J U) Qcr: Q d U RECORD CH W GER: Detrola Yodel 7000, RCD. CH. 17-14 www.americanradiohistory.com PAGE 17-14 GOODRICH MODEL R76262 THE B. F. GOODRICH COMPANY ALIGNMENT PROCEDURE The following equipment is necessary to properly align A signal generator which will provide an accu-NOTE: rately calibrated signal at the frequencies listed. An output meter. A non-metallic screwdriver. Dummy antenna: .1 mfd. RMA loop. 1. 2. - 3. 1. CONNECTION AT RADIO IF 455 kc. 12BE6 grid 1620 kc. 12BE6 grid 1400 kc. Through loop* : Intermediate Frequency and Oscillator adjustments may be made with the loop disconnected provided a resistor of 10,000 to 50,000 ohms is substituted to close the 12BE6 grid circuit. The loop alignment must be done with the loop and chassis mounted in operating position in the cabinet A single turn loosely coupled to loop may be substituted for RMA loop. TO TUNE DIAL REMARKS TRIMMERS - GENERATOR this chassis DUMMY ANTENNA mfd. HF end IF trimmers Tune to max. RMA loop HF end Osc. trimmer B Set limit of band RMA loop 1400 kc. Ant. trimmer C-2 Tune to max. .1 CDEF Loop trimmer accessible through back of cabinet drawer * Electrical and Mechanical Specifications Frequency Range 540-1600 kc. Intermediate Frequency 455 kc. Power Supply 105 to 125 yolts AC, 60 cycle Loudspeaker 5x7 elliptical type PM V.C. Impedance 3.2 ohms Power Output (Undistorted) Power Output (Maximum) Tuning Drive Ratio at 400 cycles 2 watts 3.2 watts 7 TUBE COMPLEMENT 1-12BE6 Converter tube 1-12BA6 IF Amplifier tube 1-12AT6 Detector-AVC-First Audio tube et) ID ID 1-12AT6 Phase Inverter 2-35B5 Power Output tubes 1-35W4 Rectifier tube 3 o SW -1 (ID CD R -I4 CID (*le T _ IEWMIM C*. [ Sc. 00 0 OCÀ 00 . WED 0o w o. 30HE0 150 w *EllOw mMEO. 150 wv HELPiir[ eggialf ill E u III acto III OE 1,1cu oc l 0wo0 I c r 06 o0w 00 e. cie) are cti LOCATED /N RECORD CHANGER COMPARTMENT Parts Layout ©John F. Rider www.americanradiohistory.com 0 to 1 GOODRICH PAGE 17-15 THE B. F. GOODRICH COMPANY MODEL SERVICE PARTS LI. Symbol Part No. C-2 C-3 C-4 C-5 C-7 C-8 E58626-1 B-57879-1 BD210503 C-57859-1 BM74A101 BD410104 B-55487-1 Description Cabinet Cap., Assy. Trimmer Cap., Paper, .05 mfd., 200 v. Cap., Var., 2 Sec. Tuning... Cap., Mica, 100 mmf Cap., Paper, 0.1 mfd., 400 v. Cap., Electro., 40-20-20 mfd., BD410503 C-1, 9 BM74A471 C-12 C-10, 11, BD410103 Cap., Paper, .05 mfd., 400 v. Cap., Mica, 470 mmf Cap., Paper, .01 mfd., 400 v. 150 v 13 BD610302 BC31B103 C-14 C-15 Cap., Paper, .003 mfd., 600 v. Cap., Molded Paper, .01 mfd., 400 v C-16, 17 CH -1 L-1 L-2 R-5 BD410203 B-58635-1 D-57870 B-57842 B-57262-6 B-58069 B-54466-2 C-59414 C-59416-1 Cap., Paper, .02 mfd., 400 v. Choke, Filter Coil Assy., Loop Coil Assy., Oscillator Cord, A.C. Phono Cord, Power, 8 ft Control, Pot., 500,000 ohm (V.C.) Crystal and Indicator Dial.. Knob, Magnifying Insert A-58612 B-57857-1 A-9027 A-55431 BR17B223 BR16B101 BR17E220 BR17B335 BR17E152 BR17B685 BR16B474 BR16B153 B-57841-1 Description Rectifier, Selenium Pointer, Dial Pulley Idler Lamp, Pilot, 7 w., 120 v. Resistor, 22,000 ohm, 1/2 w... Resistor, 100 ohm, 1 w Resistor, 22 ohm, 1 w Resistor, 3.3 megohm, 1 w. Resistor, 1500 ohm, 1 w....... Resistor, 6.8 megohm, 1/2 w. Resistor, 470,000 ohm, ifs w. Resistor, 15,000 ohm, l w... Control, Pot. and Sw. BR16E101 BR17B224 Resistor, 100 ohm, 1 w Resistor, 220,000 ohm, 1 w. R-15, 18 BR17B474 C-58621 SP -1 B-57848-1 A-50147 C-58711-1 B-51576-2 SW -3 B-56722-2 T-1 B-56718-2 T-2 Resistor, 470,000 ohm, lfs w. Speaker, 5x7 -inch, P.M Shaft, Drive Spring, Conical Strip, Light Diffusing Switch (Radio -Phono.) Transformer Assy., 1st I.F Transformer Assy., 2nd I.F. Part No. Symbol R-1 R-2 R-3 R-4 R-6 R-8, 11 R-12 R-13 R-14 500,000 ohm (T.C.) R-16 R-7, 9, 10, 17 _ LOOP ANTENNA TRIMMER C-2 (LOCATED IN BACK OF CABINET) PHONO POWER CORD A C PHONO. PICIFUP CABLE TO LINE CORD SELENIUM RECTIFIER OSC TRIMMER B Tube Layout 2FA1F TRANS I"LE TRANS RADIOPNONO SWITCH VOLUME CONTROL STATION SELECTOR ON-OFF SWITCH l TONE CONTROL PILOT LAMP Dial Mechanism ©John F. Rider www.americanradiohistory.com 8762621 0 ---.. , ', www.americanradiohistory.com GRANT PAGE W. T. GRANT COMPANY 12 I OUTPUT AUDIO / 330,000 PIC PUP uOTOR 32 AC RI .5 11/C 00 v0luut CO.I+310L PHONO UOTOR ON -OPE SWITCH E 50 L6 GT SQ7 ST R IO CRYSTAL PHONO MODEL 3004 Series 17-1 S2 C2 ot Mr soo , R?1 100,000 . R2 sec R5 2 R7 470,000 130 INPUT AC In. in Ca VOLTS 03 MP ON-OFF SWITCH s003 51 IO0 VOLUME CO.RROL NOTES VOLTAGES SiASURED NITR 5000 ONUS -PER -VOLT OC Ut -TER AND 1000 OHMS -P[R-VOLT AC UIT(R 5(TWEEN PINS DESIGNATED LIN( VOLTAGE III AND 112 VLutt11 voltt CDA C CO' t t OMMt 1oMr 30 3 AC R9 - 4-17-46 3300 5-. V A.C. 35Z5GT RECTIFIER VOLTAGES DC UNLESS OTNERWISI INDICATED. ALL RESISTORS ARE 1/t WATT UNLESS OTHERWISE SHOWN. TI( POINT. Volume Control and Power Supply Power Output Speaker Part No. Ref. No. On- Off Switch 105 to 125 volts AC, 60 cycles, 50 watts. 35Z5 0.75 watt undistorted (0.6 volt input). 1.8 watts maximum. 5 -inch (or 4 -inch x 6 -inch oval), P. M., oice coil impedance 3.2 ohms. GT 12507 50L6 Description t C2 C3 -A, -B C-81)-10761 C-80-10774 A -8C-11415-1 or .01 mf, 400 volts, 20% .02 mf, 400 volts, 20% Electrolytic; 40 mf x 150 volts, 40 mf x 150 volts R1, Si R2 R3 R4 R5 RG R7 R8 R9 R10 ©John C-80-10813 .05 mf, 400 volts, 20% RESISTORS* Volume control (500,000 ohms) and A -10A-11377 on -off switch 560 ohms, 1/2 watt, 10% C -9B1-59 100,000 ohms, 1/2 watt, 10% C -9B1-86 100,000 ohms, t/ watt, 20% C -9B1-25 470,000 ohms, 1/2 watt, 20% C -9B1-29 160 ohms, 5 watts, 10%, wirewound A -9C-11355 150 ohms, 1/2 watt, 20% C -9B1-8 22 ohms, 1/2 watt, 20% C -9B1-3 C -9B1-16 3300 ohms, /'2 watt, 20% C-9B1-28 330,000 ohms, 1/2 watt, 20% F. AC Input 105 to 125 v. MISCELLANEOUS Output transformer Line cord and plug Tube socket Tube retainer (for 12AT6) Tube retainer (for 35\X'4, 50B5) -12C-10074-3 B -14M-10088 A -15B-10440 A -49A-11356 A -49A-11357 B -18A-10952-1 Ii A -8C-11119 C4 GT Amplifier Chassis CAPACITORS C Electrolytic )- or B -18A-11381 D -21H-10816 48C-11884 S2 Rider www.americanradiohistory.com Speaker, 5 -inch, P. M. Speaker, 4 -inch x 6 -inch oval, P. M. Phono motor and turntable Pickup arm, less mounting base and crystal cartridge Mounting hase for pickup arm Crystal cartridge Phono motor on -off switch Cabinet 23I3.11886 8K-11885 A -20C-10317 202-11360 Grille B -2K.-11364 A -5B-11370-17 Knob Rubber feet A -25B-11390 PAGE GRANT 17-2 W. T. GRANT COMPANY MODEL 405/7 12SA7GT 7CI!Mi' CONNECT JUMPER LOOP OFERIT105 50L6GT 1250767 L4 12A IS 2205A LS G 2311.1, eI f ( \Lt b 23n T R3 4.7 R4 4.7 RS 5305 =CS MA C MA SROSIN Cas Sr IN RADIO POSITION MCSW /LAGS SY¡ -AAARe , 3SZ5GT -'LA/ ! G9 s aera SIO 705 éin e 7 t 7 7 ßS7 SOLS 7 5 15507 C55 zSOMP 30MPs 535 to 1600 kc. FREQUENCY RANCE MP INTERMEDIATE FREQUENCY_..... 455 kc. Alignment Procedure Output meter across 3.2 -ohm output load. Align for maximum output. Reduce input as needed to keep output near 0.4 volts. Volume control at maximum for all adjustments. Chassis must be removed from cabinet for proper alignment. SIGNAL CEKERATOR Frequency 455 kc Dummy Antenna Connection to Radio .1 mf Variable Condenser R.F. Section 1590 kc * 1590 kc a a Condenser Setting Adjust Trimmers to Maximum Output (in order shown) Any Trimmers on I.F. can Condenser at Minimum Capacity -Plates Out of Mesh Oscillator trimmer Condenser at Minimum Capacity -Plates Out of Mesh Antenna trimmer Run a wire from the output terminal of the generator near the receiver. However, no connection is made between the signal generator and the receiver. PARTS LIST Schematic Location Part No. T-470 28186 Li Cl, C10 C6 C8, C11 C5 C7 C4 C12 C3 C9 R2 ©John F. 1675 2073 2480 Schematic Location Part No. Description Cabinet. Wood Back Cover with Loop Condenser, Paper, .05 Mid. 400 V. Condenser, Paper, .002 Mfd. 300 V. Condenser, Paper, .02 Mfd. 400 V. Condenser, Paper, .05 Mfd. 200 V. Condenser, Paper, .001 Mfd. 500 V. Ceramic, 100 Mmfd. Ceramic, 47 Mmfd. Condenser, Variable Air - 2 Gang Condenser, Electrolytic 50-30 Mfd. 150 V. Control, Volume with Switch, 2 Megohms Cord, Line 6' long L2 28184 39160 39161 Ri R3, R4 R5, RIO R7 R9 R6 R11 R8 L4 5877 3376 Rider www.americanradiohistory.com Description Coil Oscillator Knob, Tuning Knob Volume, or Phone -Radio Resistor, 18K ohms, 1/4 W. Resistor, 4.7 Megohms, 1/4 W. Resistor, 220K ohms, 1/4 W. Resistor, 2200 ohms, 2 W. Resistor, 18 ohms, 1/2 W. Resistor, 330K ohms, 1/4 W. Resistor, 100K ohms, 1/4 W. Resistor, 27 ohms, 1/2 W. Speaker & Output Transformer Transformer, 1.F. HALLICRAF?ERS PAGE THE HALLICRAFTERS CO. P"si r 4.3 _02 .. M UN 9311 SI 33111 t[ tl M 9i r MODEL SP -44 3KYRIDER, PAi4ORA:41C 005 66 111, 60 10 O > hr 0 113 Plc 00% > zl U Y \.l. CK OSá !ry r1 N N YfV N iA n 8006 M V 001 t--" tE iii4-^NV9ar .,A L11I I MOOT L `iß JUL ; 1 001 'A Oit ^ Os 1( ohc51- wr Gu _ A059 J 03 E9 64tl -Mn)4001 A00í 94 tl 1' 17 1- Auu > rl 115 ' El úL IO' O Oli II' t OD á n o yOozl MC i 11 9-60 D 411^11001 ,00I" 114.0 00S H 11111801 fIJ II; 0p. 1101 ir Sì T 1 7 9I11001 01a1/ I UO If 11, 1 W > -118i a 100 ©John F. c!MMct IY ` man-mai - 1IUP YAyn, -:4K er .M 003 =w N áíti rt (MIO, r W t< r 0 u á Rider www.americanradiohistory.com > 17-1 r 5 PAGE 17-2 HALLICRAFTERS .THE HALLICRAFTERS CO. MODEL SP -44 Skyrider Panoramic ó g ó Y $o$.$ íóño$ uuUUU$ U$UU ññññ`" dede 0rró uuuuu$ umuU ñññññ` deee ee e o&< oÿ .Jf ú=z á á">i x > >> > > > '"" F >>> uÑ É < â; a É »»> »> '>55r>>-> >'>>" > ' x 1 ; ©John F. ews 'E <6>áasF;j E Óÿ >> se 6 .8 4 er 00000 ois Rider www.americanradiohistory.com .`o !i c `ÿa3R ägb=$ñ ez49 r=ó E v9 3 $. : HALLICRAFTERS PAGE THE HALLICRAFTERS CO. 17-3 MODEL SP -44 Skyrider Panoramic R12 C10 C12 C16 R40 Bottom view of chassis showing components location REAR PANEL CONNECTIONS: Consists of a line cord with plug, phone jack for monitoring purposes, and R -F coupling cable to companion receiver. POWER SUPPLY DATA: 105-125 volts AC, 50- 60 cycles, power drain watts. is approximately 55 id TUBE TYPES AND FUNCTIONS: 6SG7 R -F amplifier, 6SA7 converter, 6SG7 -F amplifier, 6SQ7 detector -video* amplifier, 6AC7 reactor, VR -105 voltage regulator, 6SN7 saw tooth generator and amplifier, 2AP cathode ray tube, 6X5 low voltage rectifier, 6X5 high voltage rectifier. I SKYRID ±F{!# -.14 1 Compensate* tor varying preselector cheracterlsbc. of receiver. Control* bandwidth coverage toe=arom 200 kc Control* h eirr ha a1 cathode ray tune deflectlons and audio output level. "pip" of signal heard throughr Mein tains e elver zero mark also tunes adapterthrough 20pkc. Skyrider Panorarnic Made! SP -44, view showing operating controls. ©John F. Rider www.americanradiohistory.com PAGE 17-4 HALLICRAFTERS THE HALLICRAFTERS CO. MDDEL SP -44 Skyrider Panoramic REPLACEMENT PARTS LIST FOR MODEL SP -44 PANORAMIC ADAPTOR Ref. No. Hallicrafters Description Ref. No. Description Port No. R2 R8 R40 R10 R26, 45 R25, 36 R49 RI2, 13 RC20AE201J RC20AE510J RC20AE122J RC20AE302J RC20AE5121 200 ohm, Y2 W. 500 ohm, 1/2 W. 1200 ohm, '/z W. 3000 ohm, '/i W. 5000 ohm, 'h W. 15,000 ohm, '/2 W. 8200 ohm, 'h W. 18,000 ohm, '/2 W., 0% 20,000 ohm, '/x W. 25,000 ohm, 1/2 W. 50,000 ohm, '/t W. 10% 100,000 ohm, 1/2 W. 150,000 ohm, 1/2 W. 200,000 ohm, ' W. 300,000 ohm, '/i W. 500,000 ohm, 1/2 W. 1. megohm, '/i W. 2. megohm, '/z W. 2.7 megohm, '/s W. 3. megohm, '/z W. W. 150,000 ohm, W. 100,000 ohm, W. 75,000 ohm, 15,000 ohm, 10 W.ww RC20AE153M RC20AE8221 RC20AE1831 RC20AE203J RC20AE273K RC20AE513J RC20AE104M RC20AE154K RC20AE2041 RC20AE304J RC20AE514J RC20AE105M RC20AE205J RC20AE275J RC20AE3051 1 R35 R11 R1, 4 R28, 29 R42 R14 R16 R7, 9, 48, 39 and 24 R37 R27 R18 R33 R47 R46 RC3SCE1541 RC35CE104J RC35CE7531 248G 153E 1 1 R5 1 R17 Hallic ra fters Part No. CAPACITORS, MICA RESISTORS C13 C7, 10, 14 C29 C8, 12, 15 Cl 10 uuf 100 uuf CM20A1001 CM20A101M CM20A241J CM20A5111 CM25A102M 250 vuf 500 uuf .001 mfd CAPACITORS, PAPER C3, 6, 9,16, 28, 30, C4, 23, 24, 25, 26 C20, 31 C17, 18 C22 C19, 27 21 400 VDC .05 400 VDC .1 400 VDC .1 800 VDC .25 600 VDC 20-20 MFD 450 VDC electrolytic .01 46AW 103H 46AW 503H 46AV104E 46A081 46AVI04H 45A117 TRANSFORMERS Choke, RF Choke, power filter 11 l2 Sawtooth generator transf. Power trdnsformer RF transformer IF transformer Oscillator coil T3 T4 TI, 2 Z2, 3 Z1 53A120 568087 518978 52C150 518979 50C219 518980 POTENTIOMETERS 258678 258679 258677 258680 258682 256683 258684 256681 10,000 ohms, W. 'sw 100,000 ohms 100,000 ohms, no slot 500,000 ohms, no slot 250,000 ohms R3 R15 R22 R6 R30, 34 R22 R23, 38 R20 1. meg 1. meg., slotted 2. meg., slotted MISCELLANEOUS Fuseholder Phone jack Knob Screen, CRT amp. Fuse, 1 Alligator clip - a. ALIGNMENT PROCEDURE. Allow the PANADAPTOR to reach operating temperature to assure stable operation. This may require 10-20 minutes. Adjust the screwdriver controls, INTENSITY and FOCUS, for optimum brightness and sharpness of the baseline trace. Note: Reduction of the intensity and proper adjustment of the Focus control produces a sharp baseline. Bring the baseline trace in coincidence with the lowest horizontal line on the screen by means of the VERTICAL POSITION Control. Adjust the HORIZONTAL POSITION Control 6A287 36A040 15A058 22A190 39A321 76A375 cable Spring clip connector Octal socket CRT socket Line cord and plug RF so that the baseline is approximately centered along the horizontal axis. Determine whether the horizontal sweep is synchronized to half the line of frequency by introducing hum into the grid (pin ""'') of the GSQi (use finger or screwdriver 1. A double hump should appear on the baseline if the circuit is operating correctly. 1f it does not, refer to the Troubleshooting Chart. The Panoramic screen is used as the alignment indicator. Signals should be kept below the saturation level by limiting the signal generator output voltage. continued HORIZONTAL POSITION VERTICAL PO SITI nv AUDIO JACK 87A960 76A376 6A035 6A288 8781577 FOCUS View showing operating control functions ©John F. Rider www.americanradiohistory.com Top View of Chassis. HALLICRAFTERS PAGE MODEL SP -44 THE HALLICRAFTERS CO. Signal Alignment of I.F. Amplifier Output of Controls 226KC unmodulated to pin #8 of V2. SWEEPWIDTH at zero position. CENTER FREQ. turned extreme counter -clockwise. F.M. Oscillator 455KC (or I.F. of the receiver) unmodulated to pin #8 of V2. SWEEPWIDTH at maximum. SWEEP PAD set half way. CENTER FREQ. at center or zero position. Linearity of Sweep 3lcyrider Pauora:aic Position Generator 355KC - 555KC (or I.F. of the receiver ±100KC) unmodulated to pin #8 of SWEEPWIDTH at V2. tion. maximum. CENTER FREQ. at center or zero posi- Procedure Entire baseline deflects upward. Adjust the trimmers in the I.F. transformers (Z2-12, Z3-12) for maximum deflection. "pip" will appear on the screen. Adjust the trimmer in the oscillator transformer Z1-12, to bring "pip" to the center of the screen. Turn the SWEEPWIDTH control to almost zero for more accurate indications of proper trimmer adjustment. Return the SWEEPWIDTH control to maximum and adjust the HORIZONTAL POSITION control so that the "pip" is directly over the zero mark on the screen. A Set the signal generator for 555KC (or receiver I.F. + JOOKC) and bring the "pip" to the -100KC mark by means of the SWEEP PAD. Shift the signal generator frequency to 355KC (or receiver I.F. -100KC). The "pip" should be at the + 100KC mark. If the linearity is incorrect, the deflections appear more than 10KC or division from each end with 455KC or I.F. deflection in the center of the screen. Some correction is possible by trial and error adjustment of the os- / cillator trimmer (Z1-12) and the CENTER FREQ. control. If after the adjustment is made the CENTER FREQ. control knob is off center for a 455KC (or receiver l.F.) deflection at the zero mark on the screen, unscrew and reset the knob to the center position. R.F. Bandpass Amplifier 365KC - 545KC (or I.F. of receiver) +90KC) unmodulated to a 50K resistor in series with the full length of input cable to the PANADAPTOR. Set GAIN to maximum. Turn EQUALIZER fully clockwise. CENTER FREQ. control to Set zero. ©John F. Rider www.americanradiohistory.com 17-5 Set the signal generator at 545KC (or receiver I.F. 90). Back off the side side trimmers on both K.F. transformers (T1-12, T2-12) and align the top trimmers for maximum deflection. Shift signal generator to 365KC (or receiver I.F. -90) and tune the two side trimmers for maximum deflection. Repeat both adjustments. The ratio of the peak to center heights (peak to valley) should be greater than 20:1. ' PAGE 17-6 HALLICRAFTERS +' m aa oo z p .I, 4-1 a) o+' = b q .-1 q o aU,+q 1 dqmP,aó , a +, po d o ,-1n4+, Uo m w aO ri,iru42 r-1 ed -1-2 ,-i q to N 4 m V e dq ro f1 d +' qo U M a)q M Uo erf a .1., d rn o0 +' M "-ig, d b Ñ p mt, yC %q -p y p1m .2 o ° .b m b d m . q i CT ^ aq ..-1 41) fe-, d+' M b+,o 00 M v q Op.c+. d oq O73 49 .4 ,d c1 ,cy +' +' ú;, ó.á c. Á ó4.) q o .°P1 O b rl W ó ái a1a á3 d 4)4. m á 43 d , : ú. °°?ó"áb d d .. .. t4 o0 dl dl ,d ti 'pd ó ó a +I 0V. A.lVA-G 00C. 0R10 MIXARID WINO. +75V. ©John F. Rider www.americanradiohistory.com HALLICRAFTERS PAGE 17-; THE HALLICRAFTERS CO. SW -II RIt AS SW -IR SAGS MODEL SUIF TES-PLOCAL RIMER 8 SX-42 OSCILLATOR e. RT CHOKE I.101 LI C!0! O roT[ RFD SSx wE.YSE LSRCYYO RS w O y C O 0 u TSI JJ o- .15 o'E I50 Oe SW SLLECTOS Pt.L -WITCH 1.0111110.Y T" Sw-IEE S AS .54 ro 1.5e 00.t0 NC. Am 1.12 To , IIC. AI1 . TO 15 11 TO SO fY TO SS : P. OITCO SOSOS In YC.Y .C.A./P11 YC.Y1/SY IOS PL I'.O h YO.I J .Ace I O :x 1-74 C" Rot.VTIrrvr SW-ICC O\O O RO O TROYViWVIRU T23 ^-''' JO,/ .4e. SW O i1c01- iS E 4! t 5 ,T .:..11H T io.T Yc . -A O O O o o o G = tST TS0 o SW -5A . v Lu vN-150i 30 10051 T NW .WE. PP' SOCKET Sep s++!. 4AGWiS w --. /11 e2 G G sw -xe WRRTw RR. TON: SWITCH / krw7W EOR SC. ORNATIOR Sf. 1 t S SW- [O. - SELECTIVITY SWITCH LC - fY1TCr SNOI.N IN z SASS YJ,ITIO tECLPT1O11 I t f SWITCH DC operation - filament 6.3 volts at 5 amperes; "B" supply 270 volta at 150 ma. drain for vibrator type supply for "B" voltage will run about 16 amperes.) SWITCH fW - S SHARP StOto A. CYYSTOL 11 IN CO POSITION SWITCH SHOWN IN NOR.. .t0. SROAW POSITION (The 6 volt battery AC operation - 105 to 125 volts, 50/60 cycles single phase source. (Also 110/130/ POWER SUPPLY DATA: 150/220/250 volt, 25 to 60 cycles single phase source with special power transformer available, Hallicrafters part no. 52C131.) Power consumption is 110 watts at 117 volts a-c. © John F. -t M5021.05WNED. CW 510tH 5H ROAD - Rider www.americanradiohistory.com REAR PANEL CONNECTIONS: Consists of AC line cord with plug, antenna and ground connector strip, speaker connector strip, phono input jack, and d-c power input socket. Vielwaltied schPAIiatice rr HALLICRAFTERS PAGE 17-9, 10 THE HALLICRAFTERS CO. SX-42 MODEL 7F8 T12 (PRI.) 1 MIXER 6AG 5 6 Ti R.F. 2ND E. 5W -1A LOCAL OSCILLATOR SW-1FF' (PRI) 6567 2"° I.F I.F. 126 G 5W-iIl T11 C6 C72 R14 5W-1GG 1F C35 SW -1H C90 L6 - I A2 C10B 5W -1J A3 C10Ar LI / 126 C21 B+ B+ 250 250 ( (' / /_SW.1C - C4= I 7F8 T12 Ti 6AG 5 (PRI.) 2"D R.F. (PRI) MIXER : 5W -1A C34 1 C10B B+ - AVC A2 -1J °C I A3 R28 C28 C45 R12 BAND-SWITCH SHOWN AT 2ND POSITION CLOCKWISE SHORT WAVE BAND v A2 5W -1D A3 5 SW T C461 - C9G ' YSW- ARC C108 86 R7 R34 8* 250 C9H /T10D AT CATHODE CKT OF _ MIZE POSITION CLOCKWISE SHORT WAVE BAND 5 - 15 MC 3A0 . R23 Ca3 R93 R12 GANGED CONNECT CATHODE TO R38 T - C4.- C9G TO iBB 1 --1-GANGED IN CRT. OF 65K7 C37 BROADCAST I R22 SAND R27 C38 T18 NOTES, TC39 (PRI.) Sw-SC4-15 OF SAME AS IN C50 5W -1F GRID 65K7 15' I.F. 124 C56 5W -2A I 9 D +150 5 2 6 056 R24 SENSITIVITY SW- 1IC9HI BAND-SWITCH SHOWN T C24 -GANGED - - GANGED CONNECT TO R38 IN CATHODE CM'. OF 65K7 - - 8 5W -18B CONTROL , f C9G C59 -r 7-22 R26 1 +150 TONE SWITCH (SW -4) 15 SHOWN IN POSITION 2 (HI FI) RECEPTION SWITCH (5W-3) 15 SHOWN IN POSITION 2 (A.M.) SELECTIVITY SWITCH (SW -2) IS SHOWN IN POSITION 3 (NORMAL SHARP) 5W -2ÁA R86 AVC R30 C59 , R26 C49 Rider R92 5W -1A LOCAL OSCILLATOR '5W-.A 5W-2AA 5 C28 --L . C5B 5W-10 C27 C24 BAND-SWITCH SHOWN 150 721 65K7 7F8 F. SENSITIVITY C56 039 a^ II 3 250 1 CONTROL C14 AVC MIXER 15 - 30 MC 25C R15 R3 718 (PRI) B+ I.F. SAND C57 6 5W-SC4- C2I j. P' SAME AS IN 55 BROADCAST R27 0 C38 C10C-T.. 029 65K7 050 CONNECT TO R38 IN MC. AT 41" POSITION CLOCKWISE. SHORT WAVE BAND ú 25 . R22 a C15 LINK +150 L6 D, +150 c8 1 -C9FR21 -1N C9C TO GRID OF L1 724 19E R17 R13 C104 C49 5 1 I23 I12 R86 - / GANGED -GANGED b116 W R2 C37 5W-1EE C25 L5 1 C9B-- +150 122 C27 CONTROL SW -:FF C33 C9D R23 OSCILLATOR 3 :. C19 5W-2AA 5W -1C SENSITIVITY R.F. 1620 KC. - 5W-14 MIXER E LOCAL R14 5W -12G T4 250 25C 19 ) C29 B+ 2"' 5W -2A R22 118 (PRI.) 1 7F8 T12 (PRI) 6AG5 5W-1NN R20 C26 1.62 - TR (PRI.) R.F. T1 3 C10C= AT ST POSITION. BROADCAST (A -M) BAND I83 250 250 BAND-SWITCH SHOWN 5w -1K C82 6+ B+ ser -1J.1 056 - C25 175 288 5 C9 C9C LINK C62 (PRI) R14 R8 SW - R2 5W -1H R40 L1 C54 R41 AVC Y2 6AG5 1" BAND 2 5W-1GG C77 R32 650 BROADCAST. 37 I74 540 I.F. SAME I C AVC AS IN t 51.1-1EE .5W-1JJ 1" Ï R86 +150 GRID OF a T24 R28 T100 CONVERTER 7 R36 C69 BBlI TO LOCAL OSCILLATOR 5W-1FF Y5W- C9H GANGED 6 6+ 250 1.66 C59T j- Il GANGED L L_- C9G 11B ¢ 65L7 AUDIO 5W-26 R30 SW-2AA R12 _ TO GRID OF - 058 i47 ,SW-3AA R73 5 I` C2T 085 °5W -2A T18 (PR I.) 7 CONTROL C9B 1E56 1FF SENSITIVITY 0106 C73 R22 5W- AVC C9A1 C10C R20 R8 C8 6H6 A -M DET. F, NOISE LIMITER R39 11 C9C R15 5W-lll1 R21 JE9E C9F C2i ©John AMPL. CKT. C37 SW-1EE 117 t JUNCTION OF C102 C103 IN CW SEAT OSC. E 5 -METER TO 65K7 15T 9H J -¡. C10D R28 150 R86 AVC dç!¢p[frt[Cs fr HALLICRAFTERS PAGE 17-11,12 THE HALLICRAFTERS CO. ' MODEL SX-42 7F8 ( LOCAL OSCILLATOR T1 15T 65K7 MIXER GAGS R.F. PRI.) SW 1(6 1FF 713 C31 T24 . C37 C27 B+ 9 R22 C57 Ffw-icLI ClO0 I R20 R17 250 718 C53 C39 T19 \ (FOR r a 8+ 8 150 R36 S.W. POSITIONS) FI) (A.M.) TONE SWITCH (5w-4) 15 SHOWN IN POSITION 2 (HI SWITCH (5W-3) 15 SHOWN IN POSITION 2 RECEPTION C89 R57 SELECTIVITY SWITCH C69 = (5W-2) POSITION 3 (NORMAL SHARP) SHOWN 15 IN L C96 NOISE LIMITER 250 C106 8+ 6H6 250 +150 124 . R28 TO GRID OF R12 BAND -SWITCH SHOWN 5" POSITION CLOCKWISE SHORT WAVE BAND - 27 - 55 MC AT R40 B+ 250 AVC C9H I 65L7 AUDIO INVERTER R52 , GANGED 6" 079 R39 'SW 288 C1OD 250 R43 SW -1A CONTROL 4 C51 5W-188 8+ 250 C8I = C56 B+ SENSITIVITY 5TM NOTES R18 R15 T26 a 5 C41 IC28 C29I 2, C47 3 C9F =C26 2 4 SW-1F ,LE, ' 71-17 10.7 A -M DET. 71-47 3w I.F a 5W-1EE ;SW-1JJ L2 65G7 gro I.F. C84 GANGED 7F 8 MIXER ( LOCAL OSCILLATOR 6 T6 6AG5 1" Tl 6AG5 2"° R F. (PRI R.F. . PRI) SW 1FF i5W-1HH 713 5 .90-1JJ 5W1II - - T7 /V 96-1EE . R14 65K7 1'T I.F. SAME AS IN F -M 5 -lEE Ti -< T C37 q R21 SN-1A R23 ! C913 R20 I\ SW A2 R18 AVG 7 SENSITIVITY B+ AVC R3 A2 R18 R34 ' SENSITIVITY CONTROL 250 A3 8+ B+ 250 AVC ISW-188 C1001H/T=C9G CONTROL 250 GANGED . F-M BAND 27-55 MC CONNECT TO R38 IN +CATHODE CKT. OF 6SK7 GANGED 224 . R.F. 2pR.F. r C16 5W-1II T6 R14 I SW-1A 651(7 65G7 -CATHODE CKT. OF 65K7 SW-lEE 7H 7 LIMITER C37 10123 718 RG 6 R45 i 150 rCAOÌP +150 R3 1 B+ ; AVC 250 C9G CONTROL I bSW 55 - 108 MC - 250 R62 250 288 R68 - 0 + C97 F -M TUNING METER 250 5W-3AA C10I C80 5W-3AA 1104 250 5W-3135 +150 R66 NOISE LIMITER B. 250 R64 R28 TO GRID OF TONE SWITCH RECEPTION GANGED R7I - 6H6 B+ NOTES 124 . ! R72 B+ IL69 R12 BAND "C100 a C62 R86 SENSITIVITY BAND -SWITCH SHOWN AT 6T" POSITION CLOCKWISE 1 8+ R44 R38 AVC R34 B+ 250 C89 SW- IAA 263 C59I C23 7 'SW-358 DISCRIMINATOR R43 B+ 5W-ID 1092 R56 C87 R69 039 TI LINK 728 6H6 c8I 5W -1F R13 CW BEAT OSC 5 -METER AMPL. T26 5W-1J 9A LIMITER R21 R22 ! F -M ( 724 C301 SW-1JJ 7A4 7H7 a SW-IGG 6-e--- r° L2 F -M 1 3 6T12 CONNECT TO R38 IN GANGED C94 MIXER ( LOCAL OSCILLATOR GAGS +150 GANGED 7F8 GAGS 1" BAND -SWITCH SHOWN AT 8" POSITION CLOCKWISE SHORT WAVE BAND 55 - 108 MC R28 (I Ri2 BAND -SWITCH SHOWN AT 5" POSITION CLOCKWISE - C51 C12I R15 LINK R3 B+ CAO C29 8+ 250 C53 5W -1D 150 6 - B+ 250 C23 129 AVC F-M C47 BAND - T18 C27Ì2 CTC9B A3 6SK7 1" I.F. SAAT AS IN 5.W. TO GRID OF q 3 C39 5W-1JJ Icz8 C1OA 724 s 1H R17 C23 T1 C49 J I_ - R26 .` R22 - RS C11 C10A C UNK Rla á2 C7 cil jB= er T6 5W-1II BAND -6TM POSITION SW -SF 2 RS 2"°R.F. TO GRID OF C31 R2 1 MIXER (LOCAL OSCILLATOR GAGS 6AG5 R.F. In (5W-4) SWITCH 15 SHOWN (5W-3) SELECTIVITY SWITCH GANGED POSITION 2 (HI FI) IN POSITION 3 (FAA) SHOWN IN POSITION 3 IN 15 SHOWN (5W-2) 15 (NORMAL ©John F. Rider www.americanradiohistory.com 65L7 AUDIO INVERTER SHARP) R52 1C84 ;SW-1KK 5TM POSITION HALLICRAFTERS PAGE 17-13 PAGE 17-14 HALLICRAFTERS THE HALLICRAFTERS CO. MODEL SX-ç2 iÓ w . V?ú' =a= o bb3éJS 3 V g !"..3FF ° c> >t". m p, ÿ Ñ~ d e,,w.45 °.+a O u m X.N 6 Y O>"Qttlfa°iÓ¿Ás.°i A p m¿ N M Aó..ti AOqi. E ' V O q.. O _ p M A V ºó " ° É ¿U GG O g Ñ 721' s O °Á"aá'< ° Guu C 6 v a fi ó E p m :0 ' ¿ W121 Wp .E. m.,a Ñ q m Ó E á em .. n é" 4 W M á m m g A 4 Y q4 S V+ ÿ .. r i e u V Ó 4 á l m m q V m.Ó U V Q m E).Or, 3 .y ° q m V 4. 4 O .. ?p á O V 4 Ó é° Óú P ñ q au á Ó tltlU V É Ó Óe+O qm V V e. zv u E 'yá "1 O p A O w F M¿i° á â U u Ñ fi.,q. 9oaw.,ó U 00 L Ñ O< w .> e V Ó pF é p F q mÉüéeYmk.qOy E m m ti fi u x A M Ó ° n ú .+ ? Smu1 ñ b Q Oo W O b m 8 dCOIÇ gg W MISSS ©John F. Rider ©John F. Rider sm F q w w q.4 qy m q áác£3uíGí m m m mm m m zq8 BOTTOM AND SIDE VIEWS SHOWING ADJUSTMENT POINTS Ó ggÉggg§ig s 8 TOP, Ú É fOm g á E q 2122'2Ñb9,á5. 8guNóB$o 5mee § HALLICRAFTERS PAGE THE HALLICRAFTERS Q ' P a el á áá á $sgév , éU máóéñé Y N a Y .á w $ Y á ó e p ti bi LL yyM N N N typ°i NA uu o4o Pl N [L Il '"aáaaáá c° zsásr$s É 11 L É N< pp tltl Ó e0 w w , pp e L t. q w yy 11 y É N pp pa I E II E E ? e T. qqÑ° i tVO Y Op O Oe th V Ú U N N cO mO O. N Ú U U tn .O cOn AJ . ,/NJ F Sp V G :_ .22% < Oa N ñ t,'" ~ Ñ É áN F á O-5.74 Ó. a O ó 0.1 c e ó ? 0b e E e Ó O ói 4L E ú ó A z Ó. Y O w ÿ Ñ p Y e 04t 4 .-t Y e e Ú .. 8 I iN SppT ,O N rilfliA .1 88um U .Oi . E Ñ ° ° 0022 nxx $$$$ñ Ó ii igi8§g§§ 2.222 F Ó e f ó I' c e N N N s s s< s i á < $ s á « « $ $ $ $ $ $ s s á ,q°.áááá waapaG,w 9p ;sóáóYg' a ti J Y° á_YNe W q~ ó ! Ó _ e V U pi ,-I _ 4 i e 19 _ Ó2 S V, C ú 2 . < .g gg rdárdâg3qa sd m ég Ó w < e2 -..,74.°4u.; N I g gg. á á 0< ó0 4 ú I p S Z S Lp p p Ó Ó Ó,O O .§2.,.-g 88 I ttWOO V ase3g% << YYM á LL YOt Y VJ H< Y., i°i ty°y. ywy bp fi N 0 á M á .°. w eL pp .°+ .. n 0 v i w á Ó áM áááááá ydnidz ...... óbY,a, M,1..-.2 O 0 tl p aa f 0 NNAAÑAN y0 2 ti p Ú 0 0 F CppÇág ? e « óe 1QRä ÑNNÑNN 4 ° L 4 441'221 m Á Á á á 0á á á Ú Ú S S i S x S O ó 11 O Fg ti O q a Ae q ti ó w 0 aPt > Ó O p ! Y a Y Y Y V m< C . ó ti .. !i O O Ó M 3 Y a "t'2' -J1.:3 A a N NC° b V 7 b Y a V! Y M O Y e p ú b S A1 e W q -t Ó _ 9 p® , w el Ó Y N ° q O M H Ów b Qp I ti V m.qi Ó S M Me á ó 9 d N e 9 N F ZZjjj e U Ú ÚOJÚÚ ncPAP 22222 2222 2222$222 m.Yi rr11 Ñ i6' 6. gQN U v] 121171 22222 AAAAA 0 0 0 0 44i4á 2222 I 1 1 1 1 bW V O F S S 2 l'°111 U 1C M d Rider www.americanradiohistory.com I I I 0 000292": 1 mmN.mN.mm,N, 1 b 3 3 F. < á Ni ©John Ó 6a , 17-15 MODEL. SX-42 uu 2Oiy U CO. 1 1 1 1 1 1 b 2 2 AAAA N N N 2229 0 0 0 U Z x S 0 0 0 0 0 0 0 0 2 c 4034e N N N N PAGE 17-16 HALLICRAFTERS THE MODEL SX-42 HALLICRAFTERS CO. rl rléi:1:irl.-I:V5Ú,5O¿5¿O Inlqmininnmmlolomnmmmloinnnnnm155iYSu . ill P . ìN1!#!!*+.q o o v E gg wó G g 99919wmmmm8:;g ..ER" 999143..mmmmm 2:37.;'. mmm mm,O q V 0.+.-ir-Ì..w+~i.~i.~i;~nMMw M 4 M Ómmmwoaúúc4c4úcoúúc°úc{4{. Ó Ó Ó Ó 8 7 40 uuUou.......,....Múaaúá.°+,°+YYÓ O {9{.. O ó {9{..."°. F F F {9y. q m ` pp ÓÓOOVMF4.yÑ.ÑtitiÑÑúa 4ó 8uuuu8°iggsésg.ó 993431dó:áá3cïuu 888888"@sóm<'á A NWF F 11 8 :w m 1 g ii "n $g ó:á333ö3á g e i ñ 2111 nCFm0) II eCi 9.9.882M92&2851 11 II F ÉÉ " $eela 14 13 H. öehhJ aaaaaa N¢a¢¢aáa¢¢a ¢¢a¢a¢a¢aa 5 N O G Ó 4 G Ó Ó .M P P P q Ó O q P 5 Oq pp 4UÓÚP{O{..4{P{.. é OppÚ O {Á.ÚVP gUUÓ ÓÚPÚ.Ú.U.A^P<--Ú^VP w VU {N úÑ^u^u^uYuuY--<áu ÓF ÓVNYi4YVÑ4m3^43TUiNY $N"y.ÌN O N p~NO.+. "\Vy .-IOUÑtiU.yO ypp My vEEpEEeiáááeLÁEEe;ppótpJJógE qó úppÓV4 hNEAÓBU.ióQ`yÇóROC. :ñ mm.W .-mO e.2wa N ñS ei i a - oRó mm0 mieóp .6 v u °ág .diti00 ) Nÿ0ppOgq0OÓ0óm. º 2 íNq1°[i i- 3 V S 0 ñ vvCmJvfOiO[mmOpá 2 yrnló pm ss rr:y NCOa Opma NCVCVNNNt.JmtDemtm.lJf 'I a vd9'v$ Ipo aaaaaa 1 gguuuL'bmdg ÑRn88yy 0 ä3 b .+ämm cu, F. rm 2 ga8ï8 ©John O fi Ó Ó Ó Ó Ó Ó Ó Ó Ó Rider www.americanradiohistory.com I I 1 a¢¢¢¢aaa 1 : HALLICRAFTERS PAGE 17-17,18 MODEL S-47 THE HALLICRAFTERS CO. LI. mr' s S) uel CERNIC JAI )W]A K4 ! O O UAW CT) W30 WED IIO FRONT IN I.W_A-)Wrw.c-kP O `TIM C `` MM -K ROTE: FRONT E00-ET0 K 0 \, 7 -d30\\ 140 C! IS , POSTION. rM-PNOM., Ì D nY 100-\0 -.0 RI L ONORI t Ir -311«. LI. ,4450 n0 -IM SW]0 t c... 1110NT AM- VA KT. .INI WOO GD .u. i0% OO,NLET 2 V. SAL] 16 [ KAR O 5 O SW3E .]) K0.1 o SW)C o KG) O I. ..,p 1. °0 MUM EAR O 15 .54 J. ,-- ° CS. AI MOWER Lv11rVT )! Li. IO 5V. GTic AMM. ,e FILMENT SUF.ST 0010 DIT nR MLF ATE AM 4111/ SOT[: AE!TOR vA00E3 ARE LL ORLE IN ONUS REl I)TM. 10%, Ir[ WATT TI OTMERWI)E INOICATEO. L CAPACITO v ARE NNI UMLE)) OTNIMooli 114 IMICATEO KAR .A!! TpE i. g M 5E01 0RR1 FROITT. UR CONTROL 50.55,001 RO enoll 1.11.04,1-1-51 5111 ON 1 O O w RN 45A.T LAST RESISTOR STN.OL AGGIGNED-R-Tie CORDERSER STNEOL ASSIGNED PUS H BUTTON WeeOAf. Ma ,soT SWd Tubes Speaker output impedance Antenna Tuning Tuning Range Fifteen ..500 ohms. .Provisl ais for external long wire antenna for AM bands and a folded dipole (300-ohm) for FM band. .Manual and- mechanical (Five push buttons. channels for AM and five channels for FM.) . (BC) 540kc - 1700 kc. 18 mc. 15 mc (A) (B) 9 me - (C) 5.8 me 88 me - (FM) © 12 mc. 18 mc. 108 mc. -41+15-- MAIN CMASS! -. E UP THE PUSHBUTTON. Note - 0.1 I.F. I.F. BUTTON SETTING: PUSHBUTTONS FOR F M TUNING TRANSLUCENT PUSHBUTTON INSERT REMOVED BEFORE SETTING UP PUSH- F LA (AM) (FM) Power Supply Power Consumption Insulate the muting switch springs before setting the AM buttons. . '1 PUSHBUTTON LOCKING SCREW 1. Select any one pushbutton. 2. Pull translucent insert straight out. 3. 210 Insert screw driver blade through large hole of pushbutton into slot of locking screw. (See Fig. 1). MIR 4. Loosen locking screw about one-half (Not more than one full turn.) 5. With pushbutton depressed, carefully tune in desired station with the manual control and tighten the locking screw. PUSHBUTTONS turn. FOR AM TUNING Fig. 1. View showing pushbutton setup. John F. Rider www.americanradiohistory.com G.)v 1EN RECEPTACLE SOI PHOM JAG -C-.1 INSERT A LONG SHANK SCREWDRIVER THROUGH THIS HOLE WHEN SETTING MUTING TUMEI -Ai Ry - 1 AY R7. SSOa K )lNNCE SWITCH 455 kc. 10.7 mc. 105-125 V. 60 cycles A.C. 180 watts. cicedzipeci scheineaticsfr HALL'ICRAFTERS PAGE 17-19-20 MODEL THE HALLICR4FTERS CO. 3-47 tl) TTTT m., 39 441 CEA6,.1G C101, CT2 ss , Sw3e Z!e-)s teal EST xsÿes -38 Cl6 Dsr 3G 4.5E43 04 r T9 C20 40 4 T úl O\ ì FRONT T, IRTERit3iE OT 0 IRTERSTACE yr tl' ilr C663, ti 433 aN _ IF 3M- 2R0 DIT. 224 Ly J C4 O rl 413 CSC 6836 =aº vv - C63 ART. or- GOD. ) cs C32 4s2 460 yMN 042 C. 22 6aC SIND' SIC 2 REAR TREBLE Rn i, Sw3A t! .14 , O O , o 0 1 o o 0 420 Ó 3J0 Iw e O 0 O LOE CONTROL44w 04161.2 206 O C FRORT. 11 O r" 0 A: Stew o -2 -)-CI 4rs Sw]C OSEC3 REAR C22 J YE 444 10 IY1 O 1 t. $ BAND- SWITCH SHOWN AT 1ST POSITION. SHORT WAVE A BAND ~ AUDIO ME B+ CONTROL C-89 C-92 Trimmer, R-1,2 R-3 330 ohms 5 watts, ww. 47 ohms 4 watts, Carbon. 39 mmf. FM, osc. stage 500 V., ceramic 444218 CC30sH39oM RESISTORS 15-18 MC. R-4 R-5, R-7, 2 6 meg-ohms, volume control ohms f watt, carbon u,000 ohms f watt, carbon 0 ohms watt, carbon 10 49 R-8 fr 244864 RC65CE470M 254685 RC20AE100M RC20 AE333M RC20AE101M R-9, 10, 12, 13. 14, 77 SERVICE PARTS LIST HALL IC RAFTE R'S PART NUMBER DESCRIPTION REF. NO. CAPACITORS C-1,3.4.5,6.8.9. 12, 13.14. 15, 16. 12,13.14.15,16. .01 mfd 600 V., tubular 600 V. tubular -647_103F paper 17. 18. 20. 21. 22. 23.24.35.90 C-2,26.27,28 .02 mfd C-7,11,31.32.50, 51 paper .05 mfd paper C-25 .01 mfd C-30 C-33 C-34 C-36 C-37 Thn 600 , V., tubular 600 V., molded paper .1 mfd 200 V., tubular paper 600 V., tubular .005 mfd paper 600 V., tubular .003 mfd paper 60-20 mfd 450 V.. 20 mfd. 30 V. electrolytic 40-10 mfd 450 V., 20 mfd. 30 V., electrolytic F. Rider . 6AY2C3F 464Y503F 4646103J 4640104H 464Z502J 464Z302J 458099 458100 500 V., ceramic 500 mmf 1000 mmf 500 V., ceramic 10,000 mmf. 150 v., ceramic 10 mmf 500 V., ceramic 47 mmf 500 V., ceramic 1.5 mmf., ceramic 10 mmf 500 V., mica 100 mmf 500 V., mica 22 mmf 500 V., mica. 22 mmf 500 V.. mica. 500 V., mica. 220 mmf 500 V., mica. C-59 330 mmf 500 V., mica 47 mmf C-60,61,62 .001 mfd 500 V., mica. C-63 .0039 mfd 500 V., mica. C-65 Tuning condenser, RAM' C-66 Tuning condenser, 'FM' C-67 570 mmf. trimmer. C-68 Trimmer assembly, ant. C-69,70,71, stage. 72,73,74 Trimmer, FM, mixer stage. C-75 Trimmer, FM, ant. stage. C-76 C-77.18,79,80,81, Trimmer assembly, osc. stage. 82 C-83,84,85,86,87, Trimmer assembly, mixer stage. 88 C-38,39 C-40,42,43,44 C-41 C-45 C-46,47 C-48 C-49 C-52,64 C-54 C-55 C-56,57,58 GRORE u a2 w+ 2S roor 6 Ri 474147 474148 47832103N1 474149 474150 474160-3 CM20A100K CM20A101M CM20A220K CM20A220M CM20A221M . CM20 A331M CM20A470M CM30A102M CM35A392J 48C176 48C175 444189 448190 444192 444194 R-15.16 R-17.19.20.21.22. 23.24 R-18 R-26,27,28,29, 30,31 R-32 R-33.34 kL35.36.37.38.39 R-40,58,59 R-41,42,78 R-43,44.52.64 R-45,50,51 R-46 R-47,48 R-53 R-54 R-55 R-56 R-57 R-60.61 R-62.65 R-63 R-66 R-67 448195 R-68.69,70 448196 R-12,73,74 R-71 1000 ohms i watt, carbon 10,000 ohms 3 watt, carbon 100,000 ohms f watt. RC20AE102M RC20 AE103M carbon RC20AE104M RC20AE330M RC20AE105M 33 1 m ohs watt, carbon meg-ohm # watt, carbon f 150 ohms f watt, carbon 100,000 ohms f watt, carbon 220 ohms f watt, carbon 47,000 ohms 4 watt, carbon. 22,0-00 ohms 4 watt, carbon 220,000 ohms watt,carbon 330.000 ohms watt, carbon 100 ohms f watt, carbon 3300 ohms i watt, carbon 3900 ohms 4 watt, carbon 12,000 ohms # watt, carbon 470 ohms f watt, carbon 4700 ohms # watt, carbon 820 ohms f watt, carbon 68,000 ohms e watt, carbon. 470.000 ohms watt, carbon 390,000 ohms f watt, carbon 100,000 ohms 1 watt, carbon 33.000 ohms 1 watt, carbon. 47.000 ohms 1 watt, carbon-. 22.000 ohms 1 watt, carbon 10,000 ohms 2 watt, carbon fr 7i fr RC20AE151M RC20AE104K RC20AE221M RC20A0473M RC20AE223M RC20AE224M RC20AE334M RC20AE101K RC20AE332M RC20AE392N RC20AE123K RC20AE471M RC20AE472M RC20AE821K RC20AE683K RC20 AE474M RC20 AE394K RC30 AE104M RC30AE333M RC30AF473M RC30 AE223ih RC40AE103M schemalies ff 11 HALLICRAFTERS PAGE THE HALLICRAFTERS CO. z O p HQ N ` Wñ ( MOD3L Nt ïN, Z oQ" rN..N -Il 'I l l A i r- . 3: Im1 u 0° e.. ioºz.i 1 º7 -Y-- fá : 3- o "Qo : i -Ilw e- , ir o o i Jt Se4-1H 01 .z. ï1 sAri o- -p o ° d 4HN . J elllli!''F I Oí . 'N 1 +e= 3Z Q O m =U m UZw F- l rt. Z3 0 (r) U Q LUa rjj . . IN iï s ,. U.)Ñ3rn óO Qz O H CON (f) H ©John F. Rider www.americanradiohistory.com '2. -.-1' v 0 0 A 17-21, 22 S-47 dCi1eeJi4tiCd lr THE HALLICRAFTERS CO. \% HALLICRAFTERS PAGE 17-23.-24 S-47 MODEL LIT At 222 ws t G1 ? »G)IRD.4E r Elo L3 = f R1O ZO TE RS G, OI I ir tool RSE 1,,,Z3:0 TI IOTERSTAe tw GNOME TAGE E1 Gor ó : r[ -- G,i r.. R31 c ' ' q , Tina d il GSl ooaa Ai GROPE Rf G. IMP J GIB I R 1 113 F+Y, T=1.E1j2 h-41 31YI 33 1 - RSS TR, Yf LIS 2211 orte rieJE RS! GRD Gil RJB' GO1 C AMT. lt]. O mm S, Rn If ROVT G O O BLE CWIREPE G!3= )3X lOn O O clwly TREBLE RS RISEw RtR SwtB UL l REAR sesto SEG. 3tt G61 RI, EOS. ASSIGN Ei..w uf Wt O (1-2-3-41 Q o RII lb R p "1111 ° E -wee 50 Stc O 0 x tif Sw C SEG REMI J3C AR O w O r, 3E., O o r o G ,Ro AT w Yf IRe1 - TrIX "« -, AUDIO TO VOLUME, CONTROL B+ BAND -SWITCH SHOWN 5TH POSITION CLOCKWISE F -M BAND 88-108 MC V-3 Oscillator Type 6J6, A. F. C. V-4,5,6 V-7 -B V-9, 10 V-11,12 V-13, 14 V SERVICE PARTS LIST (Continuedl L-13.14,15,16 HALLICRAFTERS PART NUMBER DESCRIPTION NO REF RESISTORS 33.000 R-75 R-76 R-79 ohms 330 ohms, 470 ohms 2 choke R.F. choke, ant. $t age Audio :hoke R. F. (Continued) watts, carbon plug-in ballast 2 L-18 L-21 watts, carbon RC40AE333K 248870 RC40AE471M -1 SW -2 SW SW I I ©John F. 50C 208 E. x Antenna coil for BC band Oscillator coil for SW band Antenna coil for SW band Mixer coil for BC band Oscillator coil for BC band Oscillator coil for FM band Mixer coil for FM band Antenna coil for FM band L-7 L-8 L-9 L-10 L-11 L-12 Plate choke, osc. stage Filament choke Rider 534115 56B082 V -i5 LM -1, 2 50C209 50C210 52C151 558096 516905 518955 518908 516909 516910 518911 518914 516915 516916 536008 53B009 6SG7, 6SH7, Type 5114G, -3 -4 6 PL -1 -1 SO -2 SO -3 SO Line cord and plug Receptacle, phono motor Jack, phono pick-up Receptacle, ballast Socket, octal (tube) Socket, miniature (tube) amplifier Lamp, V-1 V-2 Rectifier 6-8 V. , 150 MA. 90X6SG7 90X6SH7 90 X6AL5 90 X6J 5 90X6S07 90X6V6GT 90X5UüG G. E. 1147 394004 36034 á bracket, á bracket. 864047 694169 Shield, tube (miniature tube) 69A104 Pointer, Pointer, 676645 828138 826143 754132 17B028-1 90X6BE6 AM lucite 17A027 17 A0 29 Cord, 75A006 38A017 Call letters Spring, dial d l glass, upper Dial glass, lower Dial TS-1 TS -2 75/076 Insert,push-button, metal Knob 90 X6B A6 FM Spring, pointer Push-button (black) Insert. push-button, 10 A015 64190 64190 64216 864046 Shield base, tube (miniature Spring, tube retainer Carriage, pointer 8781625 AND SOCKETS Type 6BÁ6, Antenna Type 6BE6, Mixer amplifier Phase Inverter 6V6GT/G, A. F. power tube) R. H. TUBES A. F. 6S Q7, 90X6J6 COMPONENTS Bass tone Pilot light socket L. H. Pilot light socket I.E. amplifier I.F. amplifier F.M. detector 6AL5, 6J5, and MISCELLANEOUS PLUGS AND LAMPS Transformer, FM detector Transformer, i nterstage . F. Transformer, 1st. Transformer, power Transformer, audio output Mixer coil for SW band 3 53A106 switch ass'y 60B307 606264 Treble switch ass'y. 60C266 Band switch 184092 Muting switch Power TRANSFORMERS AND COILS T-2, T-4 T-5 T-6 L-1 L-2 L-4 L-5 L-6 plate Type Type Type Type Type Type SWITCHES SW T-1 I N...2. t.4 OOOBSET Terminal Terminal strip, strip, antenna speaker Shield. speaker terminal 174025-1 7DO39-1 228184 228193 154131 88A277 884334-1 69 C173 HALLICRAFTERS PAGE 17-25 MODEL S-47 THE HALLICRAFTERS CO. UVER ANS OI Q MI K D Top view showing alignment points. PWR. BASS VOLUME CONTROL CONTROL Fig. g. AM TUNING F M TUNING PRONO GANO TREBLE CONTROL CONTROL Bottom view showing alignment points. ©John F. Rider www.americanradiohistory.com G H PAGE 17-26 HALLICRAFTERS MODEL ; THE HALLICRAFTERS CO. S-47 tiï = < ¡M r_eo O o n e- > $a! fD"3 z 0 0n 000 > 10 c o o m n o o ñ á 0 «,0 f O ' 011 r >0 ó0 :°o £/ .$ i 0 0 o O x:`t. 09 co o o m U .- ó Q 6 % Ió > o 0 mm **00.0. * * Otl£'9 peg ú = o P Ioog > N^ ,021 O O U 0 U O D 2 0 2 0 2 Y U U < 2 mm f ñR 10 . rM'OOM mOmM NWw CO {pa > N N OOOm Ñ O Ñ O ©Jo o © U < A30 o o 0 20224 o3 0,O I 4 000 m f N G O O N ai OLD Otl£"9 921 D' s Ñ .. tg Oa 2 12U h q 4.1 5 !3. ú tf .+ '`<3 Ñ m GUO T «K mmó C JJJé.Om qd Op Ñ H EmpEÑ é ti 0 é N ím-1 C 7 .oiÉ"éañmà .+ d á c, Ir .nimngá..e.aó S é ..aniM01C1N o .+ 2 l.Y. e0 m c. 3 5m; U G g..S.-oCJem 52-414012 e O CC 2 ¿b É q d ó M ta LJJÑUOid'r dqi..-gi.piadda 10 "mómmémzp @John F. Rider www.americanradiohistory.com HALLICRAFTERS PAGE THE HALLICRAFTERS CO. C74 19 R6 110 Cu Cu C76 C88 ` MODEL C69 C79 C85 Cu C84 C72 C73 / C71 C86 I SW4 C83 C68 C54 118 14 C75 4 C89 T3 Top view showing component location. C85 C68 C69 C73 C84 C72 C70 SW34 R14 R31 R67 C62 SW3c C39 R30 C87 C86 C83 C660 R23 C666 C32 C66c L6 L1 / í SW3d C65 C48 C23 C26 14 17 C61 SW34 R22 R9 C20 R41 R12 C45 L11 Front view of R.F. chassis showing component location. ©John F. Rider www.americanradiohistory.com C38 1 7-2 S-47 7 PAGE 17-28 HALLICRAFTERS THE HALLICRAFTERS CO. S-47 MODEL C11 L21 \R66 R49 -R57 R16 C55 112 R10 SW1 R18 C34 R33 I R34 C50 R4 /C63 R15 116 115 R72 /C64 /C51 113 R73 114 R74 R32 C7 R47 R64 R56 -R7 R43 R78 C9 I R62 R55 R63 R36 C31 R53 R46 R21 C60 -C1 C57 C6 R48 R20 R68 R50 R65 C56 C24 R51 C25 R2 C2 R79 C5 R54 C13 R77 C 4 R3 R37 R69 T5 SW26 R13 Bottom view of receiver showing component location. METAL INSERT INSERTING CALL LETTERS INTO TRANSLUCENT INSERT ASSEMBLY: INSULATING GARD CALL LETTER TAC MUTING SPRINGS TRANSLUCENT INSERT . Slide out metal insert from translucent in(See sert assembly. Fig. 2). . Insert call letter Pig. tab. . . Replace metal insert. 2. View showing call letter instal/a- Insulating the Muting switch contacts tion. Replace translucent insert assembly into pushbut ton. ©John F. Rider www.americanradiohistory.com HALLICRAFTERS PAGE THE HALLICRAFTERS MODEL S-47 CO. y ©John F. Rider www.americanradiohistory.com 17-29 www.americanradiohistory.com HOFFMAN PAGE HOFFMAN RADIO CORP. 11 L 11 11 11 H 14 4 U. r; I W O I xrlE 6-il *Nllll I aa \-(3--Ib e ,, O o..---vv ,< U n _f J ose `-+L1E--111 ólo 000eooaV-- John F. Rider www.americanradiohistory.com 17-1 MODELS B502, chassis 113, B504, chassis 123 PAGE 17-2 HOFFMAN MODELS B502, chassis 113, HOFFMAN RADIO CORP. Z < 3_T Q QQ eZ .irf P8gr y, N N N "r 1It ,e O OP O O & .4,N N 1n I ._ ». 1 Y W z ó rdi. .c n ' ;je j 0ó3EF ." Ñéó N .e i . i 1 Ñ u 3 - 3 ..3 .tt i i_.333 3, ó +iN00 . V ; 3 E " S E N 4r ` :;;11w .: c r E EE`sp: .¡Éi Qi6 g uº i Ñítp :i3; _FOOO 61t. o -ti: ., $Ñ je N,* + E il Ñ o Y O Otr- Ñ ';'1. N N t g a s $« öóàgssóógóôôs3 u i s C u Ñ V Û V V ac m[ 0 0 z d o o Ú N o o r- U U F X o F d o o o ©John F. Rider RECORD CHANGER: Jebsl;or Model www.americanradiohistory.com 56, RCD. CH. 15-8 "Cia,, pod dchPAIiaKiCd HOFFMAN PAGE 17-3,4 MODELS B502, B504 HOFFMAN RADIO CORP. 6 BE6 6 BA 6 R -F AMPL. Tl 1 \ b RB C24 52 // C1 R1B C31 -CH C26 LB I AMPL. C10 51 S 6 AT6 A -M DET. FRONT, `T C29 R13 - 3 C35 1C34 1C31 53 'SFC 1 - SEC.1 R19 (VOL.) C24 52 52 ,-C36 FRONT Avc FRONT L8 = C29 +285V 6BE6 6BA6 1sT -1.F. - R13 C32 6BA6 6 AL5 2N0I.F. RATIO DET. T4 1 o3 R1 R2 R33 R24 R Jc31 C7 R18 = 6C4 C28 GANGEO OSC. L9 C24 R11 BAND -SWITCH SHOWN AT 3RD POSITION F M BAND 88-108 ©John F. MC 4 Si R13 SEC.1 FRONT L8 +285V TC29 Rider www.americanradiohistory.com 53 0SEC.1° SEC.1 AVC REAR 6AT6 A -M DET. SEC.1T51 REAR I +- 285V FRONT I I C43 Ic34 +285V C32 -0- 1000-1740 KC SEC.3 FRONT 3 BAND -SWITCH SHOWN AT 2ND POSITION BROADCAST BAND PUSH BUTTON TUNING NO.5 PUSHBUTTON DEPRESSED +285V T2 S1 oS SEC -1 FRONT SEC.1 AUDIO MIXER R14 +285V SI'pH NOTE 1ST POSITION PHONO NOT SHOWN. +285v R12 /7AR R21 ó533 R20 R1B RIB 4285V R14 C32 R20 I R16 19 6BA6 R -F I- AVC FRONT C23 6BA6 I.F. 1sT. - + 285 V 51 SEC.1 / MANUAL TUNING 535 - 1650 KC SEC.2 REAR SI SEC.2 52 R12 \ Si7 .. 6 BAND -SWITCH SHOWN AT 2ND POSITION BROADCAST BAND MIXER L2 T2 '41 C17 C21 65E6 A -M DET. FRONT d GANGED 6AT6 1sT. Si SEC.2 OREAR Si SEC.2 S2 6BÁ6 I.F. e MIXER L4 R42 R19 VOL. AUDIO HOFFMAN PAGE 17-5 MODELS B502, B504 HOFFMAN RADIO CORP. PAGE 17-6 HOFFMAN MODELS B502, B504 HOFFMAN RADIO CORP. POWER SUPPLY CHASSIS I NOTE IT IS PARTCULARLY IMPORTANT THAT AM ALIGNMENT BE DONE BEFORE FM ALIGNMENT. THIS IS TO AVOID POSSIBLE INTERACTION BETWEEN FM AND AM ADJUSTMENTS AM ALIGNMENT F ALIGNMENT: 1. Set tuning condenser on high frequency end of tuning 2. 3 range (minimum capacity) Set band switch to AM position. Depress Manual pushbutton. Turn receiver on and let it warm up for fifteen minutes or longer in order to minimize drift effects. 5. Connect output meter across speaker voice coil and set meter on lowest range, but not below 2 5 volt scale. 6. Connect output of signal generator to stator of C16 (see schematic diagram and chassis layout) through a .1 mid. condenser; connect ground side of generator directly to chassis of receiver. Set signal generator on 455 Kc modulated. 7. Adjust L.F. trimmers on T2 and T3 for maximum reading on the output meter Keep the meter reading on the lower half of the scale. (NOTE: The above mentioned trimmers are on trie rop of their respective I.F. cans and are not to be confused with the iron core adjustments also coming out of the tops of the FM IF cans. Keep the signal generator output low and the volume control on the receiver wide open during adjustment.) 4 R F. ALIGNMENT: 2. 3. 4. 5. Connect signal generator to "hot" side of loop through a .1 mfd condenser -and a 400 ohm resistor in series. Set signal generator to 1650 Kc (modulated) and adjust oscillator trimmer (C26) to signa! frequency. (Tuning gang should be at minimum capacity setting for this adjustment). Set signal generator to 535 Kc. (Modulated) and adjust oscillator padder (C2l) to signal frequency. (Gang should be at maximum capacity setting for this adjustment. Repeat steps 2 and 3 to insure correct adjustment. Set signal generator to 1400 Kc. (modulated). Tune signal in by rotating condenser gang until signal is heard. Adjust trimmers C8 and C13 for maximum reading on output meter. Keep signal generator output low so that meter reading is on lower half of scale. FM ALIGNMENT IF. ALIGNMENT: 1. Set band switch in the FM position. 2. Set tuning condenser to high frequency end of tuning range (minimum capacity). 3. Solder a 5,000 ohm 1/2 w. carbon resistor between terminals A and B of T2. Solder another 5,000 ohm 1/2 w. carbon resistor between terminals D and E of transform4. 5. 8. NOTE The above adjustments must be made in sequence and the operator should take particular care that the frequency set. ling on the signal generator is not touched during alignment. BE SURE THAT THE TWO 5,000 OHM RESISTORS 1. 2. 3. 4. er T3. DO NOT USE WIRE WOUND RESISTORS. Connect the negative side of a 20,000 ohm/volt D.C. voltmeter or vacuum tube voltmeter to point "X" on diagram. Connect the positive side of meter to ground. Connect output of signal generator directly to stator of C12 Adjust signal generator to 10.7 Mc. Adjust the tuning slugs on transformers T2 and T3 for maximum output. (Note There are two slugs on each I.F. transformer, one on the top of the can and one on the bottom of the can under the chassis. It is desirable to make this adjustment with an insulated alignment screw' driver.) While making the above adjustments, keep the output of the signal generator low so that the D.C. reading on the meter is always between 1/2 volt and volt. Adjust the iron slug on the top only of T4 for maximum reading on the meter as outlined in step 6 above. Remove meter lead from point "X" and connect to point Y" Set meter to most sensitive D.C. voltage range. Adjust the iron slug on the bottom only of T4 for a zero reading on the meter It will be noted that as this slug is adjusted the meter will go from a positive indication 6. 7. Set tuning condenser to 100 Mc on the dial. Set band switch to FM position. Connect DC voltmeter to point "X" as outlined above in 8. 9 ©John F. Rider 2 615 0 0 6V6 6V6 5U4 0 0 0 0 9 10. 6 through Pin No. 1 6BA6 (R.F.) 6BE6 (Cony.) -.4* -14* is heard coming out of VO 2 --Pus' ibut on frequencies é Se e Ó 40 0 +97 +1.0 +-65 -.4* -14* 0 +97 +93 0 -.5* --.5* +1.0 +1.0 0 +260 +270 +230 +260 +260 +.25* 0 0 +1.0 +40* +23 +44 - -.5* 0 PY-Ar- y111 6.3AC 6.3AC 0 Tone Control 6J5 0 MONO ll I 1740 Ó '\a Ó \e e Figure 3-Pushbutton Adjustments 0 0 0 +230 +180 0 ----+155 0 +50 +.25* - KILIM[ lBAtti T1AOL[ 011.. I 0 IP Pe l l fl 11 B8 LLLLZ. C 46 6 } ,, *Lit b C. Cal O ).a c6 CV e (l o 00tD S I .4 Tuner Chassis TUNER CHASSIS HOFFMAN DESCRIPTION SYMBOL Cl, C9, C10, 100 Mint. Ci, CI8 1 3 ±10% Ceramic Trimmer Sect. Variable with Split Stator - 8 Mm). NO. 4012 4315 4408 .05 Mfd. 200 Volt Tub. Paper C5, C25 470 /And. »20% Mica C7, C30, C34, .01 Mfd. 400 Volt Tob. Paper C44, C51, C53 C8, C13, C26 1.8 - 30 /And. Trimmer CI1 500 Moil. 5% Silver Mica C19 50 Mint. r:2% Ceramic C20 220 Mm). - 20% Ceramic C2I 110-560 Mn,). Trimmer C24 22 Mn,), _ 10% Ceramic C27 5000 Mini. (Min.) Ceramic C29 50 Mm). 2-20% Ceramic C32 20 Mfd. 450 Volt Electrolytic C33, C41 .001 MM. 600 Volt Tub. Paper C36 .02 Mfd. 400 Volt Tub. Paper C38 25 Mfd. 25 Volt Electrolytic C40, C46, C50, 330 Moil. ±5% Mica C52, C55 C42 650 Mn,). ±5% Mica C47 .005 Mid. 600 Volt Tub. Paper C48 .002 Mfd. 600 Volt Tub. Paper )) ©John C49 C54 C43 RI 2419, 12 615, 4100 F. Rider 4003 4112 4313 4004 4023 4026 4301 4021 4029 4031 4207 4104 4106 4205 4010 4011 4102 4118 RS, R7 R6, R12, R18, R33 ' RI I, R35, 136 613 114 616, R32 619 R20, R38 R21 R22 R23, R34 R25 R26 R27 628, R3I R29 R37 R39 R40 4110 4209 4006 4545 56 Ohm »10% %Watt 4561 Bottom of Tuner Chassis 141 R42, 845 R43, 644 L1 630 R8 .5 Mfd. 200 Volt Tub. Paper 5 MM. 50 Volt Electrolytic 2300 Mmf. »5% Mica .27 Meg. »20% %Wan 617, 33,000 Ohm ±20% R3, RIO, C31 Figure 0 +.5* C3, C6, C12, C14, C15, C16, C23 C4, C17, C22, 01.0 8 6.3AC 6.3AC 6.3AC 6.3AC 6.3AC 6.3AC 6.3AC -.4 0 C28, C35, C37 1570 - 0 0 1 C.1 370 AC +16.5 +16.5 +335 7 0 CÑ again. +85 6 +230 1 in 6.3 AC 6.3 AC 6.3 AC 5 -.4* PUSHBUTTON ADJUSTMENTS accurately tuned --+80 4 (1st I.F.) (2nd I.F.) Ratio Det. AM Det. 6S17 A.F. the speaker. The frequency ranges for the pushbuttons are given in figure 2. A layout of the pushbutton adjustments is shown in is Figure 3. Note that in this figure, pushbutton number now to the extreme right, since the pushbutton assembly is being viewed from Owe rear. To make pushbutton adjustments, proceed as follows: 1. Turn the receiver on and let it warm up for fifteen minutes or longer in order to minimize drift effects. 2. Depress the DIAL pushbutton and tune in the station which is to be set on pushbutton number 1. 3. Now depress pushbutton number and adjust tuning slug la and trimmer lb (Figure 3) until the station is - 0 8 3 (Osc.) 6C4 6BA6 6BA6 6AL5 6AT6 CAUTION: The above adjustments should be made on the basis of meter readings only and no attention should be paid to what 370 AC 0 7 2 inclusive twice for proper al- 9 +65* +285 +285 6 NORMAL OPERATING VOLTAGES The following tables list the normal operating voltages to be expected at the various tube socket terminals. TUNER CHASSIS meter. Set signal generator to 90 Mc. Tune set by rotating gang condenser until meter reads maximum. Now adjust tuning slugs on L3 and L5 for maximum meter reading. While making the above adjustments keep the output on the signal generator low so that the meter reading is between 1/2 volt and volt. Set signal generator to 106 Mc. Tune set by rotating gang condenser until meter reads maximum. Now adjust tubular trimmers C2 and C18 for maximum meter reading. Repeat steps ignment. - - AC* 5 4 +190 +310 +310 +335 0 1 8. 3 . 5.0 AC* voltages measured with 20,000 ohm/volt meter. All voltages measured with reference to chassis except as follows: A C. voltages measured with 1000 ohm/volt meter. *Measured between pin numbers 2 and 8 on 5U4 socket. *Measured with V.T. V.M. (subject to wide variatiors NOTE: Above readings are obtained with no signal input because of tubes and V.T.V.M. used). to receiver and band switch in phono position. step 4. Connect output of signal generator to antenna terminals on receiver through 150 -ohm carbon resistors. One resistor should be connected in series with the "hot" side of the signal generator and the other resistor should be connected in series with. the ground side of the generator. Set signal generator on 100 Mc. Adjust tuning slug on L6 for maximum indication on I 7. 1 D.C. made on the basis of meter readings only and no attention should be paid to what is heard coming out of the speaker. R.F. ALIGNMENT: Pin No. 5.0 ARE REMOVED FROM THE CIRCUIT AFTER I.F. ALIGNMENT IS COMPLETED. The above adjustments should be 5. After following the steps outlined above for I.F. alignment, proceed as follows: I. to a negative indication. Proper adjustment is obtained when the meter is at the zero point between negative and positive swings of the meter. (CAUTION: This adjustment must be made with an insulated alignment screw driver). .47 Meg. +20% %Watt 390 Olin. c10% %W*tt 6800 Ohm »10% %Watt Loop Antenna Antenna Coil--Imadcaet Coil-F.M. Ant. 4506 4549 4557 55210 5265 »20% %Watt 1500 ohm »20% %Watt 4511 L2 L3 L4, L9 4534 L5 Coil-FM. 22 Ohm ±20% %Watt L6 L7 Cei1--FM. Oct. 5251 4560 22,000 Ohm ±20% %Watt 4700 Ohm »20% 2 Watt 2.2 Meg. ±20% %Watt 1 Meg. ±20% %Watt 4501 4551 Coil-Fil. L8 5266 5263 4502 4513 4804 4506 4555 4544 4512 4500 4548 LI0 Coil-LC. Oat. Chop. ---Ian SI 52 53 Band Switch IR.F.I Pushbutton Switch Aeaem. Rand Switch (Audio( TI T2 13 Trena/ornor- &.F. Iofontage .1 I Watt Meg. .5 Meg. Pot. (Volume) 47,000 Ohm ±20% %Watt .68 My. ±20% hWatt 4.7 keg. x20% %Watt 2200 Ohm +20% %Watt .22 Meg. » 20% %Watt .12 Meg. ± 10% %Wan 15,000 Ohm -_20% %Watt 47,000 Ohm »10% %Watt 21,000 Ohm -5% %Watt 10% %Watt 120 Ohm .25 Meg. Pot. With Switch lTrebM) 50,000 Ohm Pot. (Wass) 4556 4521 4559 4538 4546 4805 4806 14 Z Coil--R.F. R.F. R.F. Transformer-1st I.F. Transformer-2nd I.F. Tmosfnrmee--Ratio Defect. Pushbutton Toeing Aswmbly 5253 5254 5252 5103 6014 6004 6015 5264 5272 5273 5270 55200 HOFFMAN PAGE HOFFMAN RADIO CORP. .N 17-7 4ODEL B504 Chassis 123 $ o a sBgtl'gI Z 7.4.;;:V41 2, ö z --' OOOOj__=MV=11 eoro ] -,73-a -oàsosòsoBó=osos .... ........ 24. in. wS CO Z er»-óómSegi 0 8á º n MM (`7 CM C 733Z;3333;' g§.s V> - r (ch dm 47 »-z.8ó» NNuo ..--y y . N ß. t71. u f a - .VY1NW W us;i(D33 rr Ú C') «I el I I 0 I _J N U Y f U QA6 ah r -t : 1_ o zó W n o 0 ©John F. Rider E RECORD CHAè1GER: www.americanradiohistory.com ä. Gen. Ind. RC 130, RCD. (.0 CH. 17-1 PAGE 17-8 HOFFMAN i HOFFMAN RADIO CORP. ODEL B503, chassis 115 / EAT. ART TCORECTOR T{SAT.oONYtRrrR 441t7-R? 5801.pETAvOANU 70R CONTROL W5% 41111- OUTPUT 90CAET SPEAKER IQB N _ Rt3 55 1144- OUTPUT PIMPPAM Ì04t - w = UNITO. UNIT !b'"' _ lt MAIM KW _.tAR__1{it) N.t.COIL C L L3 eto aRI nun 5/144-11EeT. NOTES: SAN 'd -WGG 550-1400 RAND -13-551 SAND c-t.' _ AC. 5.5 -IOA NG E5 49.4 NI RAND SWNTOO II> REAR W SAND -A Cusp cwl. puc SWITCH ON TREBLE CONTROL lav 1 FRON POSITION. tt c r9 MOTOR RECEI RECAP,' I.F.1 ARE 455 AC. OIAI SUTTON IN LAIN REOER; LAND PLUS (j ,í' OJT A/;AEIIIIITS PAL LAMPS ALL LANAI TTAI150.4 (Tuner Chassis) NORMAL OPERATING CURRENTS Cathode Current Cathode Current (both tubes) NORMAL OPERATING VOLTAGES 5U4G The following table lists the normal operating voltages 6V6 to be expected at the various tube socket terminals. TUNER CHASSIS PIN NO. 6SK7 (R.F.) 6SA7 (Cony.) 6SK7 (I.F.) 6SQ7 0 0 0 +290 0 0 0 -.15 0 25 - 0 2 0 + 0 + 105 §V6 0 0 6V6 0 0 0 +350 5U4G - 0 0 (Inverter) 6J5 4 0 0 (Tone) 615 3 2 1 -5 +95 - 130 +290 +290 0 6 0 +95 6.2 AC +290 0 6.2 AC -.15 0 +95 6.2 AC +290 0 +75 6.2 AC 0 0 6.2 AC +22 +43 +17 +17 to 0 +20 0 -10 +50# 0 +290 0 0 6.2 AC +290 0 0 6.2 AC 335 5.2 AC* 70 5 6.2 AC 0 AC 335 AC Ma. Ma. 8 +350 5.2AC4 0 All voltages measured with reference to chassis except measured with 20,000 ohm/volt meter. measured with 1,000 ohm/volt meter. voltages voltages Line voltage # measured D measured D.C. A.C. 1 7 5 1 as follows: measured between pins 2 and 8; not to chassis. NOTE The above readings are obtained with no signal input to receiver and band switch in position "A". 117. at junction of R13 and R16. at junction of R15 and R17. RECORDER CHASSIS Pin No. 6SJ7 6SQ7 6U5/6G5 All -.3 0 6 IAC 4 3 2 1 +33 - 3 voltages measured with reference to chassis with no ©John F. Rider -+260 4 C 5 6 7 8 -.4 +93 0 6.1AC 0 0 0 0 +48 signal input. For alignment procedure see Model 1501, page 15-9 Gen. Ind. Model RC 130, RCD. CR. 17-1 RECORD CHANGER: www.americanradiohistory.com HOFFMAN PAGE MODEL HOFFMAN RADIO CORP. a sastlwr N---ss $:rorss a_oa_ _ e \a 17-9 B503 /1 o e N\n / ° e ^\O / ° 0 f\G i m \a V e Es8os$$:S$'_sasasr ig-".n3ggÑ22$$ i Ñe-41 á i , _ y ' i}t: 32 5=_j.i e3331i. s;..`= x f$i« 2 ij ;. E`j2222'z~oi - C ti° i$ '.óF ä ' É i .Y V : = . ' .lX- Je w.:X3+-"X i2 i $YXX XoOoó.'soXooX--'M o - x ' .: É_ :1 [ EE -i: X.r._Y{:22i--=' F i . V V V^ Ú [EE O . A c ; UV rl- V V ññ^ UVV VV -U J ... -S:X_ VÚVUVUVVVVVVUVVUyVVVUyV ÿ VV ' VVUÒ..:.Ors.p . . " iSSiÌ2 2SSESg 2öEs2á2 0 Eö 4 _...:. 18 .: dl<..2ó.3: o < ¿8ó8g;-Snryg-0002 : v--n-Ì2 _f.N.. i$-1 2 f !! 1 f[1uú:~=á' .: .x,xxgiì232'Sñ22i2~ >_ o>.oi çç$ç>XX -5i.....qù[tEEE $'::8 i8S2 . $.. .I.I.IEB2 >ÑXriX..X...X. el i .Ú/ in^ -_ w[ a ÒwiHr7Hn.iryww°.-nw-~ rrFfN AO n eee En ea , OI m a m /l WI C3 [T)1u- b- o D-» =i ZU OmLá áa z z ©John -d o e o F. Y :S -a- (® o L-iiii. ® 1 ris) o® ú o a 11, Ç el> O Rider r 1d{ O0 e 113 For push button frequencies see Model 3-1000, page 17-13 www.americanradiohistory.com .. n PAGE 17-10 HOFFMAN MODELS 8503, B1000 dclrestatics HOFFMAN RADIO CORP. 6SK7 65A7 R.F. CONVERTER T7 SI o 0 SEC REAR T1 Si . 4 C13 C251 2T C35 St - *C341 SEC. t REAR _ 51 SEC 2 REAR 51 // SECA ¢REAR - / 154- S *RG C17 SEC.3 REAR C22 R9 PRI. S1 TC5 #C20 AVC T2 1 SEC.3 REAR AVC SI SEC. 3 C16 52 / EA / c AN GED L2 C BAND -SWITCH SHOWN AT 15l. POSITION. BROADCAST BAND NOTE THOSE PART NOS. ARE * USED IN MODEL (MANUAL TUNING) 540- 1600KC D503 6SÁ7 CONVERTER T1 S1 T7 SEC. 4 REAR C22 SEC. C35 *C 34 SI *C20 SI 1 SI REAR SEC. 3 REAR SEC. 2 REAR S1 SEC.3 REAR R9 *R6 T2 52 PRI. 15+ L2 AVC BAND -SWITCH SHOWN AT ST POSITION. BROADCAST BAND (PUSH BUTTON TUNING 1 NOTE: *USEDTHESEMODEL PART NOS. ARE IN ONE PUSH BUTTON DEPRESSED ®John F. .M. 4 Rider www.americanradiohistory.com D 503 ` eicheNlatiel rr . . w HOFFMAN PAGE HOFFMAN RADIO CORP. MODE LS 31000 65,47 65K7 CONVERTER R. F. -0- SI LI PRI. o SEC.4 51 SEC.4 REAR REAR 51 SEC.1 T5 3 REAR C25 51 8 SEC.4 REAR. q 2 C14 C22 C 5 - *C341 I C17 \ SEC. 3 SEC .2 REAR REAR C22 *C20 AVC AVC 0 S1 *R2 C35 T2 7 R3 T SI R9 *R6 *C27SEG.3 C30 °REAR 0- C 3 D+ L3 C11 GANG BAND -SWITCH SHOWN AT 2ND POSITION CLOCKWISE SHORT WAVE BAND 6 5.6-10.4MC. NOTE THOSE PART NOS. ARE CIF USED IN MODEL 13503 65K7 6SA7 R.F. CONVERTER SI LI o PRI. 0 SEC.4 51 SEC.1 51 REAR REAR 51 SEC.1 REAR C9 I C17 T6 2I O 3 SEC SEC C351 8 4 REAR. C21 *C31 4 REAR 51 C15 2 C 5 *R2 51 SEC .2 REAR RI C f5+ AVC ' R9 SI *R6 SEC 3 REAR B+ C31 *C28 "0GANGED__ BAND -SWITCH SHOWN 3RD POSITION CLOCKWISE SHORT WAVE BAND C 9.4 -19.4 MC. L4 C1Z /' NOTE THOSE PART NOS. ARE. * USED IN MODEL F. SEC.3 REAR 22 C 3 ©John 0 S1 *C20 AVC AT 7 R3 Rider www.americanradiohistory.com 5503 17-11 3503, PAGE 17-12 HOFFMAN MODEL B1000, Chassis 114 HOFFMAN RADIO CORP. r an 2,3 u z 0 i z 3 "di 1 o Ü ;n } ó3 pÓ 3ñ Hpó 1"2 reo -D1 w.1Y ddTd`HZ rv; ---n/- le N öoo->, rrd n.0 s 03 03_ _ e 222- Mñ] / O < m z %MANNA. O< z ió 00 O r > < n:-r3 [) :n 8: pJS? Fo IpÌt ©John F. Rider RECORD CHANGER: www.americanradiohistory.com PM Model 800, RCD. CH. 17-1 dclsensutice. PAGE 17-2 HOWARD MODELS 472C, 472F HOWARD RADIO CO íOflN I y y f 1 u 1 /I C1 Oyy,1.4 O,Z 'AMAX/ O ' OO Ji `, O r ((.3 YN 1 0 o a O o4a 3¢ rW hÑ .W v 1 1YNG ó m o O IJ2 1 -Ltitz= Ifo UAL. O OZ O N _ J ~o - '--i - .0-"2 co o oI o Z¢ Oa.G O N ° 3 Pò 6 O ! O O 6 ',2,2 U Pa öQ 0\-{F \ 1, 0. O Lóó00 L X W im Zl0 O U a' 1101V-IP.í VWo-» a~C ¡ 1 II II II L.1W Ì3 1 Y ñW (NI uy u Y vN o 00 NII -» Óo N y ry L--1 1 _o OLL=i O N OF Uf 06- 0.2- N 9 -aJ á0u 8 v o3N ©John F. Rider www.americanradiohistory.com J O deliPiIf%atia, HOWARD PAGE 17-3 MODELS 472C, 472F HOWARD RADIO CO ,no º o wnM t ñ : .. .r óóó 5>u `il2m máó o o 821o: 3a n 8Nr S ñ oi xo a7 c a Q H ó- o ó öi (ri---- yH 3.1 I F 2 LL i ©John F. Rider www.americanradiohistory.com PAGE 17-4 HOWARD HOWARD RADIO CO MODELS 472C, 472F MODELS 472ÁC, 472AF ALIGNMENT CHART USING MODULATED GENERATOR SEE DUMMY SIG. GEN. GEN. CONNECTION GEN. FREQ. BAND SW. DIAL SETTING Point © OR ADJUSTMENTS 455 KC. Gang ® ® Z ® Closed Green Dots AM Ant. Post at rear 1 of chassis, loop 1400 KC. AM ® on Point© Circuit BELOW A,M,I,F, PSC, FM B A.M. - Osc. C and & 10.7 MC. FM F.M. Closed on Circuit Gang & D E ® Gang 10.7 Diagram 2 FUNCTION R.F. Trim. Diagram 2 NOTES SLUG © © 1400 KC, connected Point SEE A on Circuit Diagram 2 TRIMMER SLUG AND TRIMMER POSITIOPI CHART ORDER OF Det. Adj. © Adjust F.M. Det, to zero Closed Adj.G Voltage Point Circuit Diagram 2 Ant 3 © on and Grd. Gang 10.7 MC. FM 105 MC. FM ©Q ® 7® Back of Chassis CELCLZCD Dots) 105 MC. F.M. - I.F. F.M.(Red H Osc. and I R.F. & F.M. J Ant, and Gnd. 3 3 of Chassis Ant. 90 MC. 90 MC. 101 MC. FM ANTENNA SYSTEM: Built in loop for AM reception. Built in FM dipole. In sections remote from broadcast stations an external antenna from 25 to 100 feet long and connected to the (A) terminal on the back of the receiver may improve pickup. If FM Reception is other than local or interference is experienced on the FM Band an outside dipole is recommended, in which case the FM Ant, will act as broadcast aerial. ANTENNA f, fcI M AND GROUND TERMINALS TUNING RANGES: ANIL O Adj. F.M. Ind. Adj. 101 MC. POWER SUPPLY: (Standard Models) 105-120 V. 60 cycle. Consumption 65 watts 18 watts phono motor. ©John F. F.M. - R.F. Ind. and Gnd. Back of Chassis FM K ® Back O INTERNAL ANTENNA FM AM - 535, to 1650. KC. FM - 88. to 106. MC. CONNECT TO A & G. FOR EXTERNAL DIPOLE ANTENNA -- DISCONNECT ANDINE L INTERNAL ANTENNA CNNEC O TRANSMISSION O A1TG. POWER OUTPUT: Rider www.americanradiohistory.com Max. 4¡ watts. U.P.O. 3 watts. HOWARD PAGE 17-5 HOWARD RADIO CO 0 00 0 pppp Vi 0 \ O MFD 0 GEN. OUTPUT riV 2t S C 400 REC. ANT ^ = ORE C. GND. 0 15eC=--WWW-----0 , O© O OQ40 ODMFD _ 0...- \ 472ÁC, 472AF 20 MU.H MFD ,+ \ 472C, 472F O D O D / 00 MODELS MODELS DUMMY OD 130^ GENERATOR CHART A G TRIMMER LOCATION CHART ALIGNMENT NOTES B. Low voltage AC vcltmeter across voice coil. Repeat operation until no further improvement can be found. C. D. KC. with gang closed. Before adjusting set pointer on heavy gold line below 560 Check complete dial for serisitivity.and calibration. A. E. F. G. H. I. J. . microvolts. Signal generator modulation off and turned up to about 100,000 E on the wiring diagram at point to voltohmist) Connect electronic volt meter (equivalent position. Turn clockwise and turn slug (7) on trimmer location chart to extreme counter clockwise to 1st peak and adjust to maximum. Turn slug (8) to extreme counter clockwise position. and turn slug (8) until voltmeter Connect electronic voltmeter to Point F on wiring diagram further improvement Repeat adjustments given in notes F & G until no is to zero voltage. can be made. Adjust (9) (10) al) (12) then retrim Connect voltmeter to point E and generator at point C. (retrim if necessary). These voltage zero recheck F and Move voltmeter to post (7). produce approximately .7 volts to adjustments should be made with input signal necessary at point E. picture 3, and modulation on. Change generator dummy as shown on dummy antenna chart use AVC voltage if working with Use meter across voice coil if using RF generator, bit AM generator. L. F.M. Osc. Coil to correct Should 90 MC. signal not fall in at 90 MC. on the dial, adjust open spacing on one turn or together press slightly to Itis only necessary calibration. Now adjust slug (15). to do so. improvement can be made. Repeat adjustments (13) (14) and then (15) until no further M. Adjust (16) for maximum sensitivity. K. CONDENSER PULLEY DIAGRAM SNOWING FOR MODELS 112 -AF DIAL STRINGING 112 -AC. 472-E IDLER AND CONDENSER PULLEYS PULLEY--. FOR OR SNOWING DIAL STRIDIAL HAS LOWCR -AC WHEN DIAL NAS MODCL MODEL CRCO LALIR. ON RIGNT NAND END USED THIS STRINGING OF D.A L. ALL DRIVE SHAFT 472-F MODELS. --.0 IDLER PULLEYS-. DIAL STRINGING ©John F. Rider www.americanradiohistory.com ,% DRIVE SNAFT ` PAGE 17-6 HOWARD 472ÁC, 472,AF Od 'd CO 3 D,N /n > A Iogi a. 02 $.4 F HU 02 0 m i: d1 U . -I J, 9-1 COm ÓM C0 0) c0, f_, ++> F. CO O m O O 1> Ó ó2Ú co Ó U 0 1.7 4-4 áá 9 ri U CO co 7i1 .- R: 0) I. Á + Ú y+ C_) ri Ó T1 C O 0 CI) ^' r -i .0 1-1 cd F. ób ó +j m m 4 F):mZO O F. F. Ñ Ñp TU m 0) .d oo,F.ó o á~á S~ b y- C7 m.-1 g 0 +> bZ 0) F. CD cd'-.A.5 cd ri3m U]Rm.cim m1v óm N ó gu V p;p xs q ,-, Ó 3n >~ 5 +, 4-> i-1 O + F, a. ,a) .0 a O. U ÿ ©John Ú 0) .-1 m ..ri+> H W E ái 4-i 3 cd 0A 4-> 4..) á m F-1 o` ó+ W A Ña m ó0ó 0 H 0 Á. m a0) ÓÁ0 ri124QÑ xUp S oa ( 47 U N t)gd17 m Ñ °i F -I Ú Éma60+ óÿm F. Ó r. m 1~ +.> G) 4-3 cd Ú cd F1N 3 N 0-rí. 9-1 PO Ó 0m E -1-' O. .2 0O Ñ F. d 14 w Z 0).1 >b á0 .',. 02 O P ÿÚy T >>0) . 0) Ú. m 1ó+> m ti O .g Co O m.Úo Ó Ó w H xU O F+ 0) 60 mO r Ñ W CO cD W 60 F. > Q U O E-1 I~ N1,Y1s11+x. Ó 4->0.O ..-1 2! 11i,J14 0) r-1 H ä 0) 4113Ñ\ AÓ C CO %1.11 .L: 0) Ó0y., 9.4 r-1 0) Ód .. E. .0 60 4->4-> O m 0) 0) O)A Ñ F+ ii) 11 m0A02 ($.4v U 0) U}., O) m O 0 CO 4-)3 0 el O fr 0 W O O HOWARD RADIO CO 472C, 472F MODELS MODELS 4. CO CO Ó0 CO ód 04 r1 -4J m ri N P p b 0 >~ 4-> .-1 W7 ai O .o p E-1 U F. 3 cd g O+, b. O m r-1 b P Rider www.americanradiohistory.com HOWARD PAGE HOWARD RADIO CO 17-7 MODELS 472C,, 472F MODELS 472ÁC, 472AF PARTS LIST VC -0005 CONTROL Volume Control with AC Switch or VC -0006 KNOBS --Continued KB -0015-1 Knob-tuning & Volume (Mahogany) Volume Control 1Ñith AC Switch for C & F KB -0015-3 Knob -Tuning & Volume (Blonde) for AC -0008 CE -0009 0E-0018 CONDENSERS Variable Condenser with Gear & KB -0014-1 Hub Assy. KB-0014-2 Capacitor -Electrolytic 30-20 Mf d HW-0005 450 V., 25 Mfd. 25 V. HW-0006 Capacitor-Electrolytic 8Mfd. 25 V. CO -0034 or CC -0024. 5000 M.M.F.D. Round Wafer condenser marked Green -Black -Red 5000 T 1.M.F.D. LO -0014 LO-0023 LA -0013 LA -0014 LR -0007 LC -0012 LC -0013 COILS Built in dipole antenna F.M. Loop Antenna (Low Impedance) 1st I.F. Transformer 2nd I.F. Transformer Discriminator Transformer Oscillator Coil for A.M. Oscillator Coil for F.M. Antenna Loading Coil for A.M. Antenna Loading Coil for F.M. R.F. Coil Assy for F.M. R.F. Choke Coil F.M. Antenna Choke AS -0213 AS -0217 AR -0019 DIAL AND CONTROL ACCESSORIES Tuning Shaft Assy Dial Pointer Assy Dial Light Bracket Assy (right AN-0013 AN -0006 LI -0023 LI -0024 LI -0025 side) Dial Light Bracket Assy (left side) SP -0010 Dial Drive Spring DC -0001 Dial Cord 51" long DG-0017 Dial Scale (Low Freq. at right side) DG -0019 Dial Scale. (Low Freq. at left side) LS -0002 #44 Blue Bead Pilot Lamp ES -0004-1 Metal Escutcheon (Mahogany) ES -0004-2 Metal Escutcheon (Blonde) ES -0004-3 Metal Escutcheon (Mahogany) for 472F and 472AF AR -0024 AR-0042 AR-0058 AR-0025 AR -0065 ©John F. KNOBS Thumb Wheel Assy Thumb Wheel Assy F.M.) Thumb Wheel Assy for A.F. Thumb Wheel Assy F.M.) for A,F. C Knob for Drawer (Mahogany) for C Knob for Drawer (Blonde) for C Drawer Pull For F cabinet Knob for Doors SK -0004 SPEAKER Speaker 9" Elliptical P.M. TO -0008 LC -0010 TP-0007 TRANSFORMER Speaker output Transformer Power Choke - 500 Ohm D.C. Power Transformer - 60 Cycle 110 V. LC -0017 50-0017 SO -0013 SO-0010 TL-0005 TB -0008 SW-0016 SW-0010 CW-0009-1 CW-0009-2 AA -0008-1 AA -0008-2 AW--0015 CW-0007 AA -0027 AA -0026 AA -0025 BP-0087 Bass Boost Audio Choke - for 472A only SOCKETS and PLUGS Tube Sockets Miniature Tube Sockets Phono and Speaker Sockets (female) Phono and Speaker Plug (male) Terminal Strip (External Antenna & Ground) SWITCHES Phono B'cast and F.M. Switch (4 gang 3 pos) Tone Switch (3 position) CABINET Cabinet (Mahogany) Cabinet (Blonde) Drawer Sub-assy (Mahogany) Drawer Sub -Assy (Blonde) Carriage Assy Cabinet - Regency Style Radio Drawer Sub -Assy (for Regency) Drawer -Sub Assy (for Regency) Door Sub -Assy (for Regency) Cabinet back (Tone Control) (Phono-B'cast(Tone Control) CA-0039 CA -0043 (Phono-B'cast- CA=0053 Rider www.americanradiohistory.com LINE CORD Line Cord- 8 Ft and moulded plug Line Cord & Plug 42" long for record changer motor Antenna Jumper - 300 Ohm line PAGE 17-8 HOWARD HOWARD RADIO CO MODELS 472AC, 472AF N I- i8 Tó i v`^" 10§ ^ ósBoÉJ . c CV N 000.I ( ó 7 ___ R se N ° ° o 0 - o .0i " 0° w o 0 0 1^> 7.: 18 s IFh .O I e I* .ioo-il á --il< 'r.°ó W70 i jcì 8 -1b* 1 I x Ls) Ls) e It ói8 ©John F. Rider RECORD CHANGER: www.americanradiohistory.com VM Model 800, NCD. CH. 17-1 .d eclre«ga#ics HOW ARD PAGE 17-9 MODELS 472ÁC, 47 HOWARD -RADIO CO ' O 'Oó eois O O< rW ÑV R T ---_-_-_- ° ^ V J . Ì ("0 VUJ U m0 Ov eel elfIff-). ,0-00/ o 0 O O z o oI O o z .too z o _ a -» zo 0 01 I_- 3 3 Q 8V Z d r2C Q Qm m p O o 'LI"! z 0 m0> ot.g ©John F. Rider www.americanradiohistory.com 1Nchridaped schematics,/ PAGE 17-10 HOWARD MODELS 472AC, 472AF HOWARD RADIO CO e _ $7 - I4. Iºi O O o `---- NN.Mti O N 1-`; 0 --41.1.,2 ö.. - II? ---^--. m °.1 o roU. o 0 ° bo00-J1 . 00 - .12 ; wvnnnO erm gq _ 0 oU I < Zno < e Jú0 Of I NO' p pZ{ Qg W--4 O 078 dZi ñ« ©John F. J !Nnr m rm N D f < 07 Z Rider www.americanradiohistory.com HOWARD PAGE 17-11 MODEL 474 HOWARD RADIO CO o îó IL On ;- Y N z r n Ir O I- 0> N 20 o One ¡ 7 y0 m n m II^ n 11 o o O O U 2Ó On Lä. J I 10 La gl 2 n W N U n- ó n II O lo N ° á n 6 fV o O --- ó -- Y > Or Ó Q Ó rz_ J 1 -0ï - O o3 i n n n H á 0 n o L; > Z o o I- n Za ('-'7' ou O2 1- I- J Q W z a n r /...0 0 z Ov O;n O O W W O 0 n 0U >> ï W O ci 00 uo0 N O O c\ ea.O oW H 0, ó u o> II_ co < jV0 f- J O1. Ñ 0 I- W W <> Z2J J < 2< IL. W N Ni J= I,npOo tv N 0 Wn ON J 1 úo UN> Q ó3 on F W I CO I r jWá \ILKJ N ()oft/ O IN r ©John F. Rider www.americanradiohistory.com . hi OW I N n PAGE bCK¢/1fCrfl.C.d HOWARD 17-12 ff HOWARD RADIO CO 'IODEL 47 'EXTERNAL A M. ANT CONVERTER I !ST. LF. LI -0021 I2 BE6 LOOP ANT. F DEL-AVC AMPL. DIODE I2BA6 I.F. L1-0022 15T 5 AN -0011 A. F. 12AT6 7 270" 47K 2.2 MEG. rNVVVVV' 1- .05 MFD ZOO V BAND -SWITCH SHOWN AT sT POSITION. BROADCAST BAND sw-0005 1 0 -.02 MFD. 540-1600 A.M. VOL. CON VC KC -0001 GROUND 600V SUPERREGENERATOR CT ---I F.o 1.5- 5MMF T 1 02 = II I o M GROUND F. R. L F. l0 e COIL R-0006 MFD. 600V -40 MFD T 0 MMF 301 MMF C 2.2` ' T 500 MMF . 0-"' AUDIO TO / GRID (PIN 1) OF W 15TA.F. 500K VOL. CONT. SW -0005 VC -0001 150K TO 400v LINE CORD 5000 MMF 1.5 K I 1110MFD 25V r C 112500 MMF Isov .02MFD. L- MMF o P .11 -0004 I ANT. I/2 W LI -0028 6 2.2 MMF 8+ I F.M. I.F I/2-12AT7 O0 K C 100 MMF I -1000 MMF 22K OSC. 100^ I/2-12AT7 500 50MMF C MMF CI 20 D MMF 3-30MM CT RF F.M. OSC. LO -0025 I C 500 MMF CHOKE INT F. M. ANT. CONNECT TO F M. ANTENNA CLIP WHEN EXTERNAL F M DIPOLE 15 NOT USED. LC -0016 AT BAND -SWITCH SHOWN 2ND POSITION CLOCKWISE. F -M BAND 88-108 ("John F. Rider www.americanradiohistory.com MC HOWARD PAGE 17-13 4-> F, o a rl a) a) a) ,, CD o H .44-->' j-ó, (1 H 7 U a) - co O. a) U +1 O -i U S tU0 U .-. a) O cd a) J-) L, co 4-1 C\2 i -i a) m +-+ -i 5 O -1 Vi 3 ó } cd H l`J r }J O a) }7.', L, , O ca a) cd T 2 > U r-I + I rd O m ro á Lou) m N r -I o a) 4 Z C/ Z ->H o O a cxd N 6 c> C= oc G` U) U b ai o C= ó O Ó C.. o vp,d ä--1 @ ® ® ó M:1 H ..-1 CI ..-1i- a. .-i 4-1 4 ó w .-I o ->ri x cd Cl N ® ® 431 U Ó 0 -1-,UPi te W w o 0 4 U) Ñ IO di G. U Ó . U Ó 0ai+0 H co o U óco C\2 c7 4 V) U r=-. U U d ® t) O ro Ú] O C\ì H C2 ® In O U C=. Ó U .,a U F-,r-1 C=. co Ú a. a. C7 o xo O (1) b-I Un m .C71) cd A 4-, O Rider www.americanradiohistory.com 4-4 ó x ca ->EH, a O oxIV C/) [. W U L, )-. 4-> Ca CO m w rcd ® F, .i00 cd 4-) rl .,--. I +> + ? 4 }, U 0 m ro o a) cd :~c. +--i O t --.cd a) Mg +a) PAGE 17-14 HOWARD MODEL HOWARD RADIO CO 474 N ho a-,00 H ri Ei b -I-) 4i o cdQ UU g e [] ffx O 4-) ei m. 65 . ] (Q)mma)a) .fl .0 p E, H U ri -I -i r a. o O o O ,-, o O O I o UbÓ ó+2 .ñ á E] N N o ~ 7 O b r4i O r-1 . U) +-a ai'd ,-, ,-i A'O o.a,-,.0 4-) w 00+,0 N U 0)0)(0 N CZ á r o 4...)> co +,ra cd o + > o --i r +, N +.) , 4-) 0 O H cd F. E-4 F, Eo co F,Ñ aN N Cd O .-1 5 e- Hp. O CO O (D Kc...+, c 4-) , c '0 Hu) ßa S-+ CJ co Cd úáá z :1 gz U]U)iia0t--- W :1 O -)Fi R. ,-, 4 . il ParO-1 r--I r-1 +a, 8 Á bß +, 4-) ÓÓ 00 Ó O O CQCVC20 r -I E cd O(.0O7t` ,-a H U) ÓQN) 00 00 M O OO p g OO 11111 O O Ú 11111 H COcp >-+ O E ciD E-4 CO r-1 N H Ca!]i1.ßi xN F~ N o +, U ó ¢ N U r -i 4-) ÿ Q-'-' o) +, H O -4-2 r -i r-1 r-1 +, »o OO 0 o r-i 'd > JE 4 a. 'ri 2i 1b U)9i4rO4 fr .- O + U] r+ -I +> +, Z r-1 o .g r 1 r 1 0 0 NNNN rIr 1r-1ri ew w Z H 8 ÚÚÚÚ O c) t r-Ir1O Q) CO ÓO ÚÚÚA F. g Fi WÇ'..000U á.P.PN. C) CO O O O O +, +, +, +, ti)..-1 ,-i +-r ,-r C7 cd F., f-, H O U O W 0 U) U) 4U) 4-I O N oU] Ef CO N+, U) g cJ o CO .se O C.) F-r E-+ r=: i-) C/) r-1 N t Q r ow .a0 .x -i U.-0E-. r.o OU Z ,--i u] u) ww dF,F,F U) r Q) Q) r-i U U F O +, r-1 O O O Fi F-. F. Fi 4-)4.-)4_.) 1, 4, e-1 E F. F, >,>,>>>> ) ,i O F~ U C=, Gr. HH r--1 r ,-{ Fi rZ C=. oU . U U a ofA fx i r --i C:,C= C:, a) 4-4 cd cd '-~ Fi m I N O 'd co N P. cd r-1 dr p. U a) CO r-1 cd I F~ +i {., +, +, ,-+F,a) A A. ca i 00 CO Cm C co If3 Co co r O CO 0 N Q),-1 cd coÑr~-1 cd,An cV AAAAAÚAÁ tO dr d r O O i .-i O 0 a) +, ,.) 'Ci a) f~ U) g &Fi I U) A0 I 00 w W i I on ,a xMMMM r-I to 16 H A 8 0000 08 0 áá Rider www.americanradiohistory.com Ñ c U A U) U) I OE O ,-, ,-r t p. tu rn o $ ..-u.,-1 O O F~ Cd , +, Cr) b pp,>d.A.N'dC7'd -r ,i óD 1-) F, o ,-I cd O ,-i 7 < A P. ..7 pF. U A. 3 Q) c .-. ó C). , óD 000 00 x á3á Fn"23 r He - C0 O I I F-, i I ó ó+,id+Ñ ÚroalhrIC2Ci +, cd t (£y CY. Ó CV ,, 4-,UUUU ,-i ,-i ,-i ,-i +, >> w 0 C U) d' r ln O b go LOO C3 O ©John fl 4) Q , V/ F- N .S-1Ñ t I N 4) .2 U U 2 Ñj, Ú) `GNN ü o.n,n Uo) OC!)Ú]E, G) a-, I ,., +, CO E, r Cm Y 1n Ñ rP.O. N O) O N O ri A FL - oll) U Oá a Ow +, U H N..v-. U cil Eiá4 r rO 1 f) El cf) .. 00 000 0Q 52 HOWARD PAGE 17-15 HOWARD RADIO CO roo0 Oaf' MODEL 718, aeries X F- u m > 0 o--,^ o71 2. 117;='072 US) ,00000G CO) ó-' 5000'0--0 Q 1 vwv 93N 1 wv ..000Y01 r 000á p ©John F. 111 Gí97 '000 129E 'OOOr 2296' 12Yr azul Rider www.americanradiohistory.com o n N ñ 0 ; o n o deit@I11alicti n PAGE 17-16 HOWARD MODEL 718, Series HOWARD RADIO CO X Z r V O u+ 7l000Ó0/ ih-+ Uz (° tn.-1Hi 444 S£9Z en _%-O oos'g ----,--Zr J r i¢ LL1 ó M 0 314 I o_ /VM0219 o- (f)b .a o+U- t N332199 d1/1-1M -o Sf0 cc SZ 7 li) fee ° D u0000Z '93W1 cW) o LL ro iñ b 4 u00Sg Q. ! re Ñ NA 40Y bN33N9 311 HM Ó v ¢ aD P Ñ SZ 7 D ©John F. Rider www.americanradiohistory.com ;.O m I. Z9Z-£8 ácl:enra#ice. HOWARD RADIO CO oó Ls) M º Ulm) cMe UOC)C.J -{ ., I HOWARD PAGE 17-17 MODEL 718, Series H' ZZ 917 v00ç '93W1 .....,. D rn Ls»,.9J cD (?RRSI Z ïJ11000'0ZóZ IZ 0 Zt, Q 15000'001 a Ú(n oo m Wtf) d O- o 3 0I-.CI_ ZQ m Ó U> cJ 3 W q Tli\ p a.-I N IZV2 ©John F. Rider www.americanradiohistory.com .0 Zb0-. l co X PAGE 17-18 HOWARD 718, MODEL HOWARD RADIO CO Series X GENERAL SPECIFICATIONS 12 Tube, 3 Band, R. F. Stage on all bands, Loop for Broadcast band only, Electric Push Button Tuning with muting switch action, Built-in Phono Switch, Bass and Treble Controls, Beam Power Output, Inverse Feed -Back, 6 Ohm Voice Coil. Power Consumption 105 Watts, Alternating Current Only. SOCKET VOLTAGE READINGS FOR MODEL 718-X * Socket Terminal Number Voltage taken from ground with voltage at 117 Volts AC. Drop across speaker field 105 Use at least a 1000 Ohm per Volt Meter. High voltage reading off rectifier 355 V. V. DC. FUNCTION TUBE PLATE TUBE 1.7 5 110'6 250 8 6SF5 CATH. SG. FUNCTION CATH. PLATE SG. * 6SK7 R. F. A. 115 5 F. 65 5 6SA7 Converter 6 110 4 245 3 6SF5 Bass 6SK7 1st I. F. 5 110 6 220 8 6J5 Inverter 110 6 230 8 6SK7 2nd 6H6 Det. I. 4 5 F. 155 3 6V6GT Output 250 4 240 3 6V6GT Output 16 8 250 4 240 3 5Y3G 250 Tuning eye 6U5 8 8 16 8 Rectifier ALIGNMENT PROCEDURE FOR 718-X SERIES EQUIPMENT REQUIRED: IF LOAD C SIGNAL GENERATOR to accurately cover 1. MceNF..+de the alignment frequencies as shown .0002 MFO. below. REG. ANT. 2. OUTPUT METER (0 to 3 V. AC if used in GENERATOR 400' voice coil circuit). -I \1 .0004 MFR. DUMMY ANTENNA. Although the values as 3. O RE C. ONO. load shown in below table for antenna may be satisfactory, we urgently recommend the circuit as shown at the right to properly take care of the various frequencies to accomplish the correct alignment. START ALIGNMENT WITH: Treble and Bass controls turned toward left, Volume Control full ON to right and Band Switch in Broadcast position. After checking for pointer travel to last line above 550, set dial to point where there is no interference with generator signal and proceed with IF alignment. SIG.GEN. CONNECTION DUMMY ANTENNA TO GEN. FREQ. BAND POSITION DIAL SETTING Off .05 Mfd. Grid of 6SA7 465 KC BC Station 400 Ohm Resistor Ant. 1400 KC BC 1400 KC NOTE " ' 600 KC BC 600 KC " " 5 MC Police Band 5 MC " " 16 MC SW 16 MC 1: NOTE 2: ORDER OF TRIMMER ADJUSTMENTS See Fig. See Fig. then I.F. peak to Max. Output 1. m ®®®® O © ©Rock 2. Dial ® ® ® BC Osc. - R.F. 2 BC Osc. Pad. 2 Pol. Band Osc. RF Ant. Check Image at 4.1 Short Wave Osc. RF- Ant. Check Image at 15.1 The I.F. adjustments are reached throiíh holes in top of cans on top of chassis. Peak for greatest deflection of output meter. LAYOUT SNOWING NOW ASSL MOLL DIAL CAOLL. TO CONOLNSCR MAXIMUM ©John F. SEE NOTE TRIMMER FUNCTION GANG IN POSITION Rider www.americanradiohistory.com r (!) HOWARD PAGE 17-19 HOWARD RADIO CO FIG. MODEL 718, Series X I n B.C. 05G. PAG TOP VIEW MODEL 710E BOT TOM VIEW MODEL FIG. lid ,K 2 REPLACEMENT PARTS LIST For prompt and accurate service with any correspondence or replacement parts orders pertaining to this model, include the IDENTIFICATION NUMBERS as shown on black and white card accessible at back of cabinet. The following parts list includes the vital receiver parts only. This list does not include any part pertaining to the cabinet or any type record mechanism. When the IDENTIFICATION NUMBER is specified to us we have the complete record of your model and can furnish complete service information for the particular type cabinet (or record mechanisms with combination models) that you may have. Part No. 51-190 53-190 54-190 DESCRIPTION Part No. CABINETS Chippendale "C" Type "A" Type. CONTROLS 48-281 Tone 87-281 Bass Boost 85-281 Radio -Phono Volume CONDENSERS 59-270 Tuning 83-262 Padding BC 50-262 Single trimmer Filter, 20-10-10 mfd. 51-266 450,350,300 Volts COIL ASSEMBLIES Ant. Loop - Console L25 2035 Osc. Coil 1700-540 KC 2035 R.F. Coll 1700-540 KC Ant. Coll 5-1.8 MC 3À21 3025 Osc. Coil 5-1.8 MC. R.F. Coil 5-1.8 MC 3G21 Ant. Coil 18-5.5 MC 4A22 4022 Osc. Coil 18-5.5 MC R.F. Coil 18-5.5 MC 4022 46-936 1st I.F. Assembly Complete. 2nd I.F. Assembly Complete. 54-936 Last I.F. Assembly Complete 47-936 DIAL & CONTROL PARTS 207-310A Calibration - Tuning 2-498 Dial Lamp - Bayonet 22-427 Dial Window Drive String 1-288 Escutcheon with Window 53-352 45-3s2 Escutcheon - Push Button Trim Tuning Hand 31-448 NOTE ©John DESCRIPTION DIAL & CONTROL PARTS - Cont'd. Rush Button Tuning Assembly . Push Button Plain Pulley with Hub String Guide Pulleys Shaft - Tuning Spring, Drive Cord Tension. KNOBS 19-490 Wood - 1-1/4 19-490-2 Wood - 1-1/4 LINE CORDS 1-290 Standard MOUNTING HARDWARE 966 Rubber cushions, chassis mtg 1-703 Wing Screws ("C" cab, only) RECORD CHANGER - AUTOMATIC 10-615 117 V. 60 Cycle . SOCKETS, PLUGS, JACKS, CONNECTORS 24-768 Dial Lamp Socket - Bayonet. . . 6-772 Speaker Socket - 4 hole . . . . 25-771 Tuning Eye Socket & Cable . . . 23-771 Tube Socket -Octal 14-844 Terminal ANT-GND SPEAKERS 45-812 12" Console ("C" & "A") . 1-809 Twin to 2-809 (Chippendale) 2-809 Twin to 1-809 (Chippendale) . SWITCHES 57-914A Band Switch 26-917 Radio-Phono TRANSFORMERS 19-961 Output - Audio 55-938 105-120 V. 60 Cy. Stan 70-938 117-135-230 V. 40/60 cy . . . . 11-966 17-182 5-609 3-609 80-720 43-829 Wnen ordering any component part for any speaker, specify part number on speaker. including the prefix letter that precedes the part number on certain models. F. Rider www.americanradiohistory.com PAGE 17-20 HOWARD MODEL HOWARD RADIO CO F1-718 ..trerG .M. -C. roaw $ -- --oÓC IF - ?'' T` , ... I1 -07 ir- 'saw, .Neel H> .000'1 M, 1H ifOJ °iH --I..----, `-IW ,52, ,ººº. ,IK Q041í aJN,y incV aND a. ©John F. I .tol ( Rider www.americanradiohistory.com dCheIIIaL[Cd HOWARD PAGE 17-21,2? HOWARD RADIO CO ii h rIH. !- 1 9311Z' IBZ' B 0< # Iñ zoh-d Ó £000. Ó K O 1%1 o v000 05 U000 OS o L. SO00 !y 0 1 u r £000T 000, ^ nu r0 á II 1 71000iZ v000 e e 0 r ó 1- 000'z v000 ñ II v000 o£ v000`Of v000D V000 Z D vOOS9 UOOS9 á YI ea: 5 !!4 a.f,' » ri If 000 óz O ó %-7110-60. S: o l V N á%1C 01 ó o 0 M1 7.T vooe ó vets/oat 9ZVZ ©John F. JI e ioó m } '000 11 e t CO N N 7, Rider www.americanradiohistory.com T ...I--+ \t t t 152S252J hr e SE02 h r N 1 ry m ews°O YP 00£ HOWARD PAGE 17-23 ODEL 718 -FM- -5-6 HOWARD RADIO CO ?AGE MODEL HOWARD 718 -FM- -5-6 17_24 RD RADIO-CO .4.00c.og .....57 1 Cn Ca m 7-4 WA ..Ñer eca cd 0 2 of C.1 0211 2 a co o Ñ e co d' d' co r -i m a>4 4-> C.) d' r-1 S. U) m .1 a) c0 co LO m r--1 U'o m 4i z e j O A> S, C=: CO b.() 4-3 -4 CO .im a L. -i m Cn l-4 E-. W E a -1-i ti ti U] LO CO co co co CD +" 1 e cd .1 U co Q. O E-, E. Co 2 V 2 +3 LÌ) O O C2 CQ CQ d' co .002 CD .1 4-> O r- r -i j(- Ln Ln r -i r -i co U CO o (y L a) m N GI E-. o, ND 'UÌ1 ))0. ,1u COL D ©John F. Rider RECORD CFANG:12: VM 20, see New r`raàucEs 310, A. R. C. & R. ©John F. 40, + m cd co Ó CD Rider co ;---i 1--1 4-3 +, 'C7 E C -,U r-1 Cs. I M(.0 U U L. a) W I u) 4-> m a) Ca Ca .-a L.» d I-) co co -i co s~ -- m CD U) O n MW PG U] -i Q. > cd C7 O Ca N Cn .4 E. W Lm. -i b á. O -4-, .-i cd m U] Sti p 4-> m >) --r U .1 SOO g, P4 4> cd U S.-. 31+' 0 0 ri o CA Sr <4 a) m Á b óU] áZ om 4-, m ri01 ó) b2b2ÓÁ,E Cd ÓLnó (/)O-1 E~C=. óvU i II) Ln W 11 .00$ a °0-,or-ici) .0000 S -i SO. LC) ÚLn CV.9.000 44: U) m cd DZ cvooéi1 ---d ..s O mmmcd + ÓD Cn O (n 41 >~+m áCd o 41 ti~ C)+) 0 .-++2 m O U 4-3 ,- O r- O Op+ UQr U co CD Ú Ú E CQ co CI) a) m L. > m L. . r-4 L. +> coF-1 VD U U -- m m .,.x » r-1 cd Ca cd m O cD C`q 1 CaCi CQ P.. cd +-> (" > cocO I-) VJ >) CI UD O 4-4 Cf) Hr. 0000N e Cl) OH ti u) r- O cdM+> U) Ñ U 0 óW+> c\2 CD r-,{ a) CO 4-) co LO <4 läm 2 p CO CO CO cd F1 I cd,1 v 3 f+ U) á~ m ó` O cd U . U dCheops aíicd HOWARD PAGE 17-25126 MODEL 718-FI- -5-11 i-IÖWARD RADIO CO .'~ _ Ig5:o ä2ú fir ..Z2S`+ p 1 añ .. ,0000 ú 'gzwé9 ^ oo0tsr H iH -rcá, /ó óI bo-îos2 O tr. 'D)wr } H .,o0oosz .., ,000' 2 a< .0 30,0 ,\ vºz 91w2 92-59. 93.1? 19r -SB. 1 º 4 e1 ti ! f 000%1 ¡ 1 1_ ba_,,, h N ló{ w `w 00o'r, ...,.,..t I rñ1r ª S000 m y000e0o/ N V i; I1/.V 's. evJ. L1ddCJ OC mow 3 j &,-te)(5' II I 1 O 000.7 , IS I oa bf r11-4 `4%0e ! 4N Ñ 040. v ..0001XIj - Ul'/iL t, ÇO000 1 y000 Z v000'Of .,002 Ó- 8 -a (ow s0000' V HH) 1-+ ' óoó -1M 000'or ofof , 002 ill' f . YÌ .K+ ! Ff L, . r, , croo'z l r-yH.aoo2nr . ell c C 5001 l .,4 'VW Y.e- oos p v-09z 1 000 07 ïYZt 1 Pre u2" -005 9 O d QY ,d0 ri L. P a aq E9L T I Q44J ! ñ0 11- L_ OK:/ ÌP j9.d tbb tq 8- 000 00l N Y b b F grog' [- 'T sFir \ áßl< ñ¡ C9 { Ñ ws y4 4 j 1- .O ro bb 4 a r -c bs, t s f o-oöo f F 'I o rr ©John F. Rider www.americanradiohistory.com 1 % "-` rirsti HOWARD PAGE 17-27 iMD.OL 718 -FM- -5-6 HOWARD RADIO CO PAGE 17-28 HOWARD MOLFL 718 -FM- -5-6 HOWARD R FIG -2 SIG. GEN. DUMMY ANTENNA .05 Mid. Grid of 6SA7 GEN. FREQ. SW. 4.4 MC DIAL POSITION Off Station 465 KC Grid of 6SA7 - re- 4.3 MC move tuned Unmod. circuit " BAND TOSETTING CONNECTION w FM ORDER OF TRIMMER ADJUSTMENTS See Fig. " 400 Ohm "A" Ant. Resistor post " " 4.3 MC m ® ® ® ® 2 ®Seee Fig. e ® FM I.F. See Fig.l Galvanometer Position ® ® DSc. PAD 5 16 '© OSC BDTTOM NOTE -C or/ST \rRiMM[RS IF II 4 VIEW TOP VIEW MODEL 718TMX MOSEL 7I8FMX CONNCLT GALVANOMITER >OM TO TOM. FM DOT LCTO 5-6 5-6 la I B 675 ONVERT FM ® FM 1400 KC " 600 KC BC 600 KC " 5 MC Police 5 MC S.W. 16 MC adjust (12), for zero de- flection See Fig. (I)then 1 ow (I)Rock Dial ®®® ® ® GSD o FM Detector See Fig. 2 C FM Detector See Fig. 2 BC Osc. E Ose. - RF - Ant. Check image at 4.1 TRANS TRANS; NOTE E IF 2ÑO IFi OD -5 RI CONNOCT NCTO`tA D BC Ose. and RF Pad. 3RD TRrNMIR] MYM ,GNAL 6T,bRtla TO FM V. FIG. -1 LAYOUT TO E " " FM 48 MC (Z2) ®® SHOWING MAXIMUM Ose. - RF - Ant. Check image at 15.1 FM Ose.- RF - Ant HOW ASSEMBLE CONDENSER DIAL CABLE IN POSITION GANG E REPLACEMENT PARTS LIST - 48 MC 8th Rar. of 6 MC 6577 9A55 :FM.DLT. O Turn down tight - Then adjust BC 16 MC 1 BC. SEE NOTE ,TRANS, 1400 KC " TRIMMER FUNCTION AM I.F. peak to max. output After " - E NOTICE - For pro¡npt and accurate service with any correspondence or replacement parts orders pertaining to this model, as shown on the black and white card accessible at the back of cabinet include the IDENTIFICATION NUMBER The following parts list Includes the vital receiver parts only. This list does not Include any parts pertaining to the cabinet or any type record mechanism. When the IDENT FICATION NUMBER is specified to us we have the complete record of your model and can furnish complete service Information for the particular typa cabinet (or record mechanism with combtnation models) that you may have. NOTE A: NOTE When a re -alignment is made of either the AM I.F. or FM I.F. it should not be necessary to turn the adjustments very far in either direction. The AM I.F. adjustments are reached through holes in the base from underside of chassis. Should the screws be turned too far in, they might fall out of position which would require that the coil be re -assembled. At the other extreme, 1f the screws are forced too far out, there is danger of breaking the iron cores. 51-190 53-190 54-190 Connect Galvanometer from tap of limiter grid load circuit to ground, bee Fig. 1. Adjust for max. current. Normal gain should give deflection (with meter as specified) of 22 with 2,000 to 3,000 microvolt Input. Now shift generator frequency each side of 4.3; that is, to 4.2 and 4.4. The drop -in meter deflection should be approximately proportional to change in frequency. If not, recheck alignment. With Galvanometer connected to FM Detector output (See Fig. 1) and Trimmer 11 turned all the way in temporarily, adjust Trimmer 12 for max. deflection at 4.4 MC. Normal gain should give deflection of 9 with 2,000 to 3,000 microvolts input. NOTE D: NOTE E: F. After trimmer 12 is adjusted to 4.3. Then shift generator to 4 approximately same as at 4.4 at ever readjusted, always recheck 4.4, adjust Trimmer 11 to zero deflection at 2 MC. Meter should then show deflection reverse polarity. If the I.F. circuits are detector afterwards. Peak for greatest deflection of output meter. Rider 87-281 54-281 85-281 59-270 83-262 50-262 86-262 51-266 2A28 CH -10 2035 2035 3A21 'VIPS 3321 4A22 Part DESCRIPTION No. 48-281 B: NOTE C: ©John Part No. CABINETS Chippendale 4022 4G2, 7A3 703 7G3 55-936 type type 'C" 'A" CONTROLS Tone Bass Boost & SW Radio -Phono Volume (to 5th run) Radio -Phono Volume CONDENSERS Tuning Padding BC Single Trimmer Single Trimmer Filter, 20-10 -10-mid. 450, 350. 300 Volts COIL ASSERLIE3 Ant. Coil Ant. Choke Osc. Coll 1700.540 KC R.F. Coll 1700-540 KC Ant. Osc. R.F. Ant. Coil Coil Coil Coil 5-1.! 56-936 57-936 58-936 210-310 2-498 22-427 1-288 53-552 45-352 31-448 11-966 17-186 5-609 3-609 80-720 43-829 MC 5-1.8 MC 5-1.8 MC. 18-5.5 MC Part No. DESCRIPTION COIL ASSEMBLIES --Continued Osc. Coll 18-5.5 MC R.F. Coll 18-5.5 MC Ant. Coll FM Hand Osc. Coll FM Band R.F. Coil F11 Band 1st Dual AM -IF 2nd Dual AM -IF FM Descrlminetor AM Det FM Det.-Limiter DIAL & CONTROL PARTS Calibration - Tuning Dial lamp - Bayonet Dial Window Drive String Escutcheon with Window. Escutcheon - P.B. trim. Tuning Hand Push Button Tuning Assembly Push Button - Plain Pulley with Hub String Guide Pulleys Shaft - Tuning Spring Drive Cord Tension . 1,-490 KNOBS Wood -1-1/4 LINE CORDS 1-290 Standard MOUNTING HARDWARE 966 Rubber cushions, chassis mtg. Wing Screws ("C" cab. only) RECORD CHANGER - AUTOMATIC 117 V. 60 ^veie SOCKETS, PLUG$ JACK$ CONNECTORS Dial Lamp Socket Speaker Socket - 4 hole Tuning eye socket & cable Tube Socket - Octal 1-703 10-615 24-766 6-772 25-771 23-771 31-771 14-844 . . DESCRIPTION 46-812 57-914A 26-917 21-961 46-938 51-938 . . Socket - Octal shielded Terminal ANT-OND SPEAKERS Console 12' SWITCHES Band Switch Radio -Phono TRANSFORMERS Output - Audio ^405-120 V. 60 cy. Stan. 117-135-230 V.40/60 cy. All 200 Volt paper fixed condensers All 400 ar 600 Volt paper fixed condensers All 1/2 Watt Carbon Resistors When ordering any component part for any speaker, specify part number on speaker including the prefix letter that precedes .number or certain models. NOTE 1: NOTE 2: NOTE 3: NOTE 4: ©John . F. Rider the part HOWARD PAGE 17-2 MODEL 906-S i ett. J -m-Tm JUlA3 N 0O o° V Z o o o Y N 3Hi' .--^//VyW4 o 0 N T e> ] o o a Us O ----"& `^^^' 0'=g 0Ó (,) co 1 o z h zr 8W = V l'' m 3 -rio V 4 i M 0 QQ u,,pe,p,e o oo°'oOw:'nî Puo mN o ñ; i$ .-. Ñ ja ó=W {- rF.^ W JA F+ F, 1) p oJ U i-> 4-` ó .1ml.1A14JL N .- U 1v t0r1 N F. ZaQOO OO ti O L, . i Cr > i In a rJ U N aicE c.aN .+ O ÚÓÓua rz«'m° a a= a í..yUCCO .-1 earñ mVO o000 Zi 0 F, ' ÌN IlT- 4 \ ji móo oue9Il.-11-- ,I,zyo 1.49 Öi mOVó ° ow N O O > ,< C. +- 9 d N IF u á o c -. CA G y a cd U C C N C CO :.. .Ccdy-.t. SOi cCO z o > o > aO O ON o ri cdOU]b = N N C C U cy O ti) ÿ CJC..C".<. f-. :: L o O°0 4 ° o O o. $ oOññi < n I. 11.P O m o < zN ú ró nc. ,37 Z N1 < ó ->.411r ©John F. J ',ñ: ori 0 y ä Y . }.) c) tip m Rider www.americanradiohistory.com ., cp U O \\ dzitP.IftaiiCí1 rr PAGE 17-30 HOWARD HOWARD RADIO CO 15T.LF. / SW -D012 SECT I FRONT IIh000 R.F. z O O O -000 -- 1 LI -001e CON V. MOAÁF 6SA7 UNTUNCO RF COIL 6SG7 8 o rféoLR J dLR>6Ëd -0004 W 300 75 MMF WAVE TRAP MMF 4 I 26 ^ MEG 2 SW -0013 SECT. 0 Iln o o 2 0 o 4 O O FRONT O ISO^ 0 7 loo 4 .05 O 0 O o ' ' SECT 4 FROM T 33K AN 0005 O SW -0013 ScCT.3FRÓNT 5-30 .05 2200 op: o.4 oo 70 T--66QQOO 000 LOOP ANT_NNA O O MMF MFD AN T. 12-2K GNO. LA -0007 DISC'S'? LOADING COIL 2.2 - ^ 5-30 MMF MEG."I 15T. Po; -_,i T 500 mur B0C3T B+ 05C. COIL LO -0022 AVC J ION PHONO NOT SHOWN 100v MFDT` e00 V 1_ B+ 250V BAND -SWITCH SHOWN AT 2ND POSITION CLOCKWISE. BROADCAST BAND 0013 SECT / SW F 1 noNr N OOO , p2 o o o 1ST. l.F. 300 64 Mr i O 1 6 SG7 e a o o LR -000j R.F. o 0 d 6 6b 0- 6SA7 VNTUMEO AC COIL 7/162 1W LI -0018 CoNv M5OIáF .dQbÒb -0004 75 Nike LR WAVE TRAP 4 26 ^ 2 O 0 nqo .05MF 15O O ^ 2 ro4 ;0 O o° o J 0 3 -0 o o 70 T-0pp 0 SW -0013 SECT 4 TROPE SECT3FRÓNT 33K o 5-25 MMF O SW -00,3 SEC T.2 REAR 5-25 MMF o MMFi MMF LA -000 B 00 ANTENNA COILS BAND'A MEG. ^ SW -0013 SECT 2 FRONT -- 8+ BAND 'A OSC COIL Av 100V LO -0021 J Mr 600v ANT. GNO. BAND -SWITCH SHOWN AT 3RD POSITION CLOCKWISE SHORT WAVE BAND .A 2.5-7MC John F. Rider www.americanradiohistory.com . -T B+ 250V eclrerrcetics -OWARD RADIÓ CO SW -0013 SECT I FRONT LR -0o03 R.F. O ^ oo o b b D 6ö0 UNTUNCD RF 11 O O ° .04 } o W 1 300 7 MMF - MÁÁF ò 7 1ST. {.F. LI -0018 CONV. / 51(^COIL 8 / \-1-- HOWARD PAGE 17-31 MODEL 906-S d-ö-Öe LR -0004 WAVE TRAP 4 I MEGI 26 OSMFD I50^ O 0 0 c IOC" .05 MFD O B . TO 0 4 -0013 SECT 4 SW FRON T 0 O O SW -0413 ,C CT. REAR 5-25 : MMF LA -0009 ANTENNA COILS E+ BAND'S 0 SW o -00,) SECT : FRONT loov IMEG.^ O .0 4 O O O B+ O >950V 0 AT ANT. GNO. BAND -SWITCH SHOWN 4" POSITION CLOCKWISE. BAND B SHORT WAVE 7-22 MC ©John F. Rider www.americanradiohistory.com PAGE 17-32 HOWARD ALIGNMENT CHART indicated positions before following alignment chart. Loop attached to chassis Volume control on full Set dial between broadcast stations Radio phono control at radio DUMMY ANTENNA 1 .05 Mfd, 2 .05 Mfd. 3 400 Ohm. Line GEN. FREQ. SIG. GEN. CONNECTION ' ® ©e I.F. Peak to 455 KC BC Off Station e Null 600 KC BC 600 KC C 1400 KC BC 1400 KC 4 400 Ohm. Line 5 Repeat operations 3 and 4 6 7 8 400 Ohm. Line 400 Ohm. Line "A" Ant, Post TRIMMER FUNCTION Off Station "A" Ant, Post "A" Ant, Post ORDER OF TRIMMER ADJUSTMENTS BC Ant. Post POSITION DIAL SETTING 455 KC Grid of 6SÁ7 "A" Ant. BAND ©OD SEE NOTE A Maximum Maximum BC Osc. and R.F. B C D E MC A 6 NC 20 MC B 20 MC 6 c® Maximum F ©© Maximum G Accurately set signal generator at one NC and check through both short wave dials, harmonics to be one MC apart, I.F. adjustments are Iron core slug tuning and it should not be necessary to The move them very far in either direction from the factory setting, since they are of a very stable nature. Important. Connect the signal generator to the antenna screw on the outside of the radio chassis and keep the metal of the chassis between the generator lead and the wave trap coil. Use your signal generator to the desired turned up powerful position and adjust the wave trap trimmer to null. Padding condenser adjustment for calibration at low frequency end of broadcast band. Set dial at 1400 KC. Adjust oscillator and R.F. trimmer for maximum sensitivity. Check broadcast stations across dial for accuracy. True Signal at 6. Image at 5. True signal at 20. Image at 19. DIAGRAM SHOWING THE CORRECT STRINGING OF THE DIAL CORD ON 908 MODELS. DJohn F. Rider www.americanradiohistory.com HOWARD PAGE HOWARD RADIO CO o H C K 3 2 C I I Y 0E E m EEY a)°" 0 ~ V] V f.(Á 0] CYf]Ú ~aO.+Y Y [.F00020M 0.. Ó] moo C0.-.bd .0 120(2.7 .7 =t] fa0 H ....0o.-..-.1i:C 4.4.YYm 44 fN10 FO. In CL' 1 »O 0 4. > .O i. Yy 0 ÚÚgLIi.f..-7. h0 ..+.{-.. CririvHbHR.HHp PCO 40..E.. O W.1V).40.H.E..E-.70] 40 CI A C1 C1 is a M. = c omo á çY..O 7, >,óp 3 ÁÁ m i ,c mY Mg W J bóV m0.ó Y H N ÓÓ OÓ qóq 8 és e 2 Wie .0XCÚÑ ,Y1-. $$ 40 m Á > MA 0 Y 0 0 y 02.?>:' 0 .-I Et, .1..b. 0 m0s F1» rN-I N , O0 B' O = Uo m Ó OÓ m 4 $ o ám U iF m N Ñ 8 m cM [O OH N N M 10 t0 ti 7.. q 8 E. 4 .7 N N OH H N m 0 PA0 2322222 >! Ñ a gegeg4 s s r... md'm *10 0f. i.) E irm.dC > > .-. (d 1ri á$ m 1dd>C.EC 0 m ÿOEJ-] M> O4. ;O G.P. EO 0 E E Fr.,C EriHaU+ E CH Ñ.Oi E 0 i. i. m.01-i003 Q.2>:2' 0 YiC XYO.pp+ -`m 0,40 oY0 O .-EIÑ ("2.2>P Y mHa O0 OL H7$74.0 U O U > m J 1o F. J o M .O m Y EX OY0 Y .M- X 2U aldoac0.1 i.F{Oie41 O m gM YCPWO Z O 01 HI R 40 o Y T. F Ya] 0 k. H H iy O V Ó. Y 4;3' Y U Ó a E G' O L.. wY"c y 4. R X Y . . 8 C 0 m Ó Ir ..1Y . É a). Ú Y & m ; V+ 4 0 4§ ID . ri . . a á + 0 o 0 0 U f0.4 O D O O > > Ó Ó m @ C U C Ó 0 4Ei O 4. EC we» .. CO 2 fL. I > Rider www.americanradiohistory.com Yr1 7 > &.->140. 4VI d m 4. y c40mEEE 3 000 O o U CZ 0 EE[JV ..0e.O EN13> fOA; ÑL.F Y O10-YrirY-I COCO>> Ú aY M Ú r Ñ a QÑ > OH N r,1YOt.E O d o 7tdCY0 -'P. ÑmErÍá p> o. .>-. .-1 üHV.Xd.0 4. =.g4., d N In >m>mF WÓppP7C a E .11. Orr N o 1 00 .1, N gFÉ S e mWY .C- f. Y sm 88 M.,d i. 4. .bYM41 m C.+a m 01 aFf1 mm amo moo..0Y 7G,C .CY YY 0.0 00Y I 71 gËEgF 9 I 0 EU U E .F., Y COrIH FO i vEEm 0~iÁ mi. b0 H''[J-IOH i8gÑ .no .. .7 ÓrH1m .e-2 R ; IV VV mCCOy i YY ' m rt 0á,cá 0 .. Ñ - 2 V E EY U à YC ÑY 1) q LG 8 [] á á3 } < gg4 á .0 dd 0 FtOd F1O0 0..d CI O] .Ym. aaEY 0-f C.d rNir-/rOI L1 moco Ù1 E m UUY QY Y 0 Ú U ±' á o E. R. rE1 49 >..0. O.. éc w G LmÁ Y 40 m .->'i W 4-,--.H r.0 E C ChG 17-33 MODEL 906-S YY11O0pppp q40 .Z 0 U 60WÓNMN 0 1 f. m OY 4. 4. pp ti 00 YriYYY c.+.... HOU>m0U 000 00 4. 0) á ¡,O. gm* m(] 4mE, d. CU.H-..H-'CGÚÚUU OOti.+.+1100 Ú 0 mb +4E 4.4.4. 0 0 0 OOG U (...E-..04,4,0 UOOEE (¡.,.,, 4..{(.. 00E 40EE4.b +Fm asCc,w i? 0.-.e-+H.1 PPPuuo C OQOpCCECOINmEC 10E E40 Ud'UUU r2..3aaHNO00a 100 10HN 00 gó 99 WW UW W so 000 qggq4??9Yq 40 mr-ÓOrmlrm.ÑÑÑeg 111:1s2252 PAGE 17-34 HOWARD N;ùllEL 909-M HOWARD RADIO CO ª a 7 Ñpqpq ä Y O nnnnn Y O ]á 'efeTir' -N p \\ r r Ì 3 Y; ..1 8 é`y-q2)-S C0 a) CO CO 00r1>>. U a) a) C 'Cl áó J r -i . cd cd cCi oo. > ~ ,ó rl>> 4-> í..a O F- F. g_. -4b cd b4 m.-~i J-> J-> J+> e3 cd -,--0 -1 ó 000Ca3ó cdoNJ->H .-1 > ,-> ,-I m a o ºN b .-7 a) á ca cad U CD o ,Or., N CO -- ; . woo \ HI ; 04º00 ¡oo og 12 :,-',..14, \di 3$ \ ,_~°s ,4040 p $ r -I r-I .-+ 4 CD O -)LL J>.. td 3 0 O] 0-I~ Q) W W yF.OJ b0 W cv cd U i-> .CI,' -c CD r O+0 > a)o cd ,-1 A O C 4-> .--I a) F. w w U s. o ~ dßCd a) C +>D)ld.O ~ 4-,bg. co +> 4-) a) b ó .a 1-r r-I r CCoC a-» U..O.Q o Rider RECORD CHANGERS: Webs:.er 1TM ,x'_040'. 50, Model 400, RCD. www.americanradiohistory.com e Ú m m 4-, oOJ00 rbz Z+>ti9v F. > ci w á 3 cdCao Ñti-+É Ñ ©John 4-, wcpf s.a) r-IÓUa)cd 1 cm. O U ceaD Ubw a)m lee 1-1?C 60mx., 'V bÁ,ON CD ~ai cd .r roX o i. b >.cdm ,< a) R. oo J-, r-1 P. 60 m óórn .wx Qp0 Aa)CO) ,- >, >a f.F.Oa a)oUP+-c á,abC )I N cd O P.cdr-1+> m>-U.,' 4.1 -I 4-, co ,C ..--I 1= . >.w r Ìi 0 [ 4 / 18 U -,r L- cd Ó .0 J. ,-d-cd>>~ g 4 0 ci> s a_ N g. (d 1 0 b0 V cd m Ñf..+o !~.. o +> `g.`dá ; a 4-) ldcd bÿ CD RCD. CH. 15-1 CH. 15-1, VDI 800 RCD. CH. 17-1 dcl:enra#scá. \11 HOWARD PAGE 17-35 HOWARD RADIO CO AN -0007 6SA7 SW -0007 K7 SECT3 5 10 FRONT SSW -0007 SEC 2 SW 3 FRONT 909-M CONVERTER R- F AM PL. 6 S MODEL 0007 SECT 5 4 L1-0016 7 1FRONT SOµµf LR -000S ISw-0007 SEC 1. 8 REAR SW -0007 - \\ SECTS SW 05µf 0007 REAR T SEC 2 1µf REAR _l 6 47 K.O. 05µf 270n 05µf -T IKn I .lµf 9 -0007 SEC.4 REAR +285v \ SW SW 4¢ -0007 6 FRONT SECT 5QSw-0007 3 SECT 5 FRONT AVC AVC +285v GANGED AT BAND -SWITCH SHOWN 2ND POSITION CLOCKWISE BROADCAST BAND NOTE: IST POSITION "PHONO" NOT SHOWN. . CONVERTER R -F AM 6 PL. S K7 SW 6SA7 0007 SECT.3 FRONT CR -0006 3 5 I- 5W LA 5 10 SECT REAR I 50µµf 14 8 SW -0007 SECT .3 / REAR OSµf AVG }47Kli / +285V / 0. FRONT IKn AVC/ / / \ GANGED 50SW-0007 SECT 5 270n +265V - \ \ \\ BAND -SWITCH SHOWN AT 3RD POSITION CLOCKWISE SHORT WAVE BAND F. LI -0016 7 Q FRONT SW -00071 ©John 0007 SECT.4 -001 // / / '---/--- . / \\ \ \ Rider www.americanradiohistory.com / SW -0007 SECT. S REAR 4 / - SW -0007 SECT 6 10 FRONT Kn PAGE 17-36 HOWAR HOWARD RADIO CO 909-M MODEL GAIN =I4% AT 400C.P.S. --GAIN= O45X 4. AT 400 CPSI H . IeKtIO% íi50 6SQ7 V E e ` AUDIO SIGNAL I 6V6GT OOISMFD 300V 100 5 _LMMF IMEG a q GW NOTESIRE SISTORS ARE 124 w.20% . .3 70 Ie eH 220K +11 V ^ 22016 2200^ 2H 200." 22016 YID% N 6J5 6 _ 100K 1 H I/2w 2200^ ±10% +38V H 70-0003 W.W. 4I7 220K H 6V6 GT SPEAKER SOCKET T 2 e a 3V.FIL, -10V BIAS FILAMENT STRING OI ENTIRELY UNGROUNDED ON POWER PACK CHASSIS. ONE SIDE IS GROUNDED ON R F CHASSIS ONLY. 2 2 + NOTED UNLESS OTHERWISE W. 1000 OHMS a 8+285V '5 4 500V q ONO ' 3 -_-- V. ,H I MFO. 1! S 400V. -1 S _ ____ 4/16 1 VOLTAGES SHOWN ARE MEASURED TO GROUND WITH 3 -1.0íV ELECTRONIC VOLT -OHM METER UNDER NO SIGNAL CONDITIONS. AND ARE SUBJECT TO - 20% NORMAL vARIATION. = T +100V Tt 02 RFD 600v 002 TMFD II000VCJ f II +V. 255 I400MFDV. 4TK +310V e.2^ IW YI014 -n v 500 ^ 4370V !V 120 MA 5Y3GT 2A D Iww o V FROM RF o o A.C. CHASSIS AC SOCKET FOR PHONO. MOTOR PLUG T 450V I 315V R.M.3 AC p PER SIDET o 1 O 6V6GT 6J5 + 20MFD. 20MFD + T450v 2 O IMO/ O SY3GT 4,0^ IOW 06410 O117 TUBE LOCATION LC -0009 SO V 6307 _ I 4 H e 6.3V.FILS.14Á:K ALIGNMENT CHART Set controls at indicated positions before following chart. Loop attached to chassis. Volume control on full. Set Dial between broadcast stations at low frequency end of dial. Tone Control set at clockwise position (normal). Band Switch at broadcast position. Adjust all trimmers for maximum sensitivity. r 1 .05 Mfd. 2 .05 Mid. 3 Note B 4 400 Ott. Line 5 GEN. ¡REQ. POSITION DIAL SETTING 455 KC BC Low end 1400 KC BC Note B 1400 KC Antenna on loop 11.9 MC SIG. GEN. DUMMY ANTENNA CONNECTION Grid of 63A7 p68K74 BAND ORDER OF TRIMMER ADJus1MENTS TRIMMER FUNCTION SEE NOTE A 1,2,3,4 I.F. 1400 KC 5,6 BC Osc. and R.F. BC 1400 KC 7 Loop B SW 11.9 MC 8,9,10 SW C of BC Accurately set signal generator at one MC and check through short wave dial, harmonics to be one MC apart. J NOTE A. The I.F. adjustments are iron core slug tuning and it should not be necessary to move them very far in either direction from the factory setting, since they are of a very stable nature. NOTE Inductively couple signal generator to loop by wrapping one or two turns of wire around outside wire of loop and fasten one end to the high side of the signal generator. B. NOTE C. In adjusting trimmer #8, be sure the image of the I.F. is at approximately 11.MC. Do not knife gang unless absolutely necessary, and then with extreme care. Are .L EE LL AD c a. to M Marva. m.4 RECOMMENDED DUMMY ANTENNA. Although the values dS snown aer may be satisfactory, ..,o. in above table for antenna load the we urgently recommend the circuit as shown at cEMLw.Arog -o MEG ANT. 4.. right to properly take care of the various frequencies to accomplish the correct alignment. rr.. CAUTION: A .0004 ©John F. Rider www.americanradiohistory.com -^v RE GND PAGE HOWARD RADIO CO BOTTOM VIEW LO- 0018 BC. OSC. TOP O O LI -0018 LR -0008 SW. I ST IF. RF TOP IDLER PULLEYS SCHEMATIC DIAGRAM OF DIAL CORD STRINGING MODEL 909. - CONDENSER PULLEY (EXTREME COUNTERCLOCKWISE ROTATION) DRIVE SHAFT REPLACEMENT PARTS LIST VC -0002 CONTROL Volume Control with Switch CE-0005 ctiaENSEB3 Tuning Gang with Gears and Drive Hub Capacitor - Electrolytic 20-20-20 MFD 450 volts Capacitor - 25 MFD 25 volte AH -00n7 LA -0010 IA -0011 LO -0018 LO -0019 LR -0005 LR -0006 LI -0016 LI -0017 QO115 Loop Antenna and Backboard Antenna Coll - Broadcast Antenna Coll - Shortwave Oscillator Coil - Broadcast Oscillator Coll - Shortwave R.F. Coil - Broadcast R.F. Coll - Shortwave 1st I.F. Transformer 2nd I.F. Transformer AC -0006 CE-0006 SWISH 8W-0007 SW -0006 AS -0220 AS-0218 DC -0001 SP-0010 AS -0242 AS -0243 DC -0001 DO -0002 DO -0003 PL -0010 IS-0002 I3-0003 DIAL AND CONTROL ACCESSORIES Tuning Shaft Assembly Pointer and Slide Assembly Dial Cord 54' Spring - Dial - 40 oz. Load Spring Steel Dial Light Assembly - Left Dial Light Assembly - Right Dial - 3roadcast (Lower) Dial --Shortwave (Upper) Dial - Howard Name Antenna Cable Plug - 4 Prong Pilot Lamp (Type /44) 6-8 volt .25 Amp. Blue Bead Pilot Lamp (Type #51) 6-8 volt .20 Amp. White Bead F. Knob Knob Knob Knob Knob TO -0005 LC -0009 TP -0001-1 TP-0001-2 TP-0004 TRANSFORMERS Output Transformer Kilter Choke (395 Ohms D.C.) Power Transformer 60 cycle 110 volts) or Power Transformer 60 cycle 110 volts) or Power Transformer half shell type) (60 cycle 110 volts) - Tuning and Volume Acousticolor - Selector Switch - - l' Dia. - 2' Dia. (door) (drawer) 9 -TUBE CQiPL@RNT TU-6SQ7 TU-6i5 TU-6V6 TU -5Y3 Tube Tube Tube Tube Tube Tube SO-0010 SO-0011 80-0012 80-0007 Phono Socket Socket - 7 prong wafer Socket - Power Outlet Tube Socket, Octal CA-0039 CA -0038 Line Cord with Plastic Plug - 8 ft. Line Cord with Plastic Plug - 6 ft. CA -0043 Changer Line Cord with Plastic Plug - 42' (Power CW-0006-1 CW-0006-2 AA -0003-1 AA-0003-2 ABINETS Cabinet (Mahogany) Cabinet (Blond) Radio Drawer (Mahogany) Radio Drawer (Blond) SK -0008 Speaker 6' T11-0SK7 2 used 2 used 2 used Band Switch - 6 Section - 3 position Tone Switch - 5 position PR -0070-1 Metal Escutcheon PR-00702Metal Escutcheon ©John Kim KB -0015-3 KB -0007 KB -0008 KB -0018 KB -0016 TU-6SA7 S LINE CORD Pack Chassis) Mahogany) Blond) Rider www.americanradiohistory.com >( HOWARD 909 -MC MODEL TRIMMER LOCATION CHART PHONO INPUT 17-37 9' Elliptical P.M. for J www.americanradiohistory.com DETROLA PAGE 17-1 MODEL 626, with INTERNATIONAL DETROLA CORP. loctal tubes Model 626 with Loctal Tubes SOCKET VOLTAGES TUBE 14B6 50A5 35Y4 l'OSITION AF Amplifier Power Output Rectifier 0 54 AC 3 4 5 6 7 40 0 0 0 0 0 12 AC 118 125 0 40 0 12 AC 0 85 AC 0 125 9.0 127 117 AC 85 AC 8 2 1 54 AC NOTE: All DC voltages measured w.th a 1000 ohm -per -volt meter from B- to socket contact indicated. All voltages are positive DC unless otherwise marked. Volume control full on. Zero input. Tone control in clockwise position. Line voltage 117 volts AC. tek R-3 221)W 11 il L-6 Al MiD. C3 a D02Mf0 II e PHONO PLK-UP 02 YED ` } rTj¡7 tw533 c-z oMrD c-. 3V:0 R-3 '.,:;v 4©. f b n w 4 ©e,/ Ti¡ o c6o1, T WIRE -RUT Wiring Diagram Model 626 With Loctal Tubes AMPLIFIER WITH LOCTAL TUBES Symbol C-1, 8 C-3, 7 R-8 R-10 R-6 R-1, 3, 4 R-7, 11 C-5 T-1 Tube Layout ©John F. Rider 9 SP -1 RECORD CHANGERS: www.americanradiohistory.com BD410103 BD410104 BD410203 BD610202 BR16C392 BR16E151 BR17B156 BR17B224 BR17B474 A-8948 A-9528 B-9564-1 R-5 C-5 R-2, I'art No. BC31 B503 C-4 C-6 C-2 A-51160-1 B-51318-6 A-51578-2 B-54466-1 B-56029 Description Capacitor, .05 mfd., 400 v. Capacitor, .01 mfd., 400 v. Capacitor, 0.1 mfd., 400 v. Capacitor, .02 mfd., 400 v. Capacitor, .002 mfd., 600 v. Resistor, 3900 ohm, 2 w. Resistor, 150 ohm, 1 w. Resistor, 15 meg., 1/s w. Resistor, 220M ohm, 14 w. Resistor, 470M ohm, 1/2 w. Cap., Elec., 40-20 mfd., 150 v. (Metal Container) Resistor, 133 ohm, 5 w. Cap., Elec., 40-20 mfd., 150 v. (Paper Container) Cord, Line Knob Transformer, Output Control (Tone and Volume), 500M ohm. Speaker, 4 -inch PM Irt. Det. Model 550, RCD. CH. 15-1 Int. Det. Model 650, RCD. CH. 17-1 CAGE 17-2 DETROLA INTERNATIONAL DETROLA CORP. MODEL 626, with miniature tubes Model 626 with Miniature Tubes V. 0 A 6v G 2V 9 C6 .01 23V. MPD R-3 220M11. II C-3 V PHONO PICK-UP -T C -I .02 MFD. C-2 0.1 MFD. i i 002 MFD o f 70V DSMFD. C-7 .002 MFD. -5 .02MFD 40MFD. 20 MFD. 2, R-9 39001E R-5 13311. CHASSIS 96V '439 TI 27V SV WIRE -NUT .l MOTOR o 117 V. AC 60'1, WIRE -NUT SW -I SP I SPEAKER NOTE: All DC voltages measured with a 1000 ohm -per -volt meter from B- to socket contact indicated. All voltages are positive DC unless otherwise marked. Volume control full on. Zero signal input. Tone control in clockwise position. bine voltage 117 volts AC. Controls shown in clockwise position. All tube sockets shown from pin end view. Wiring Diagram Model 626 With Miniature Tubes AMPLIFIER WITH MINIATURE TUBES C-5 Part No. BC31B503 BD410103 BD410104 BD410203 BD610202 BR16E151 BR16C392 BR17B156 BR17B224 BR17B474 A-8948 R-5 C-5 A-9528 B-9564-1 T-1 R-2, 9 A-51160-1 B-51578-2 B-54466-1 Cord, Line B-56029 A-56171 Speaker, 4 -inch PM Sheet, Service Symbol C-4 C-6 C-2 C-1, 8 C-3, 7 R-10 R-8 R-6 R-1, 3, 4 R-7, 11 Tube Layout Sl' -1 ©John F. Rider RECORD CHANGERS: In+. Det. Int. Det. www.americanradiohistory.com Description Capacitor, .05 mfd., 400 v. Capacitor, .01 mfd., 400 v. Capacitor, .1 mfd., 400 v. Capacitor, .02 mfd., 400 v. Capacitor, .002 mfd., 600 v. Resistor, 150 ohm, 1 w. Resistor, 3900 ohm, 1/2 w. Resistor, 15 meg., 1/s w. Resistor, 220M ohm, 1/3 w. Resistor, 470M ohm, 1/3 w. Cap., Elec., 40-20 mfd., 150 v. (Metal Container) Resistor, 133 ohm, 5 w. Cap., Elec., 40-20 mfd., 150 v. (Paper Container) Transformer, Output Control (Tone and Volume), 500M ohm. 550, RCD. CH. 15-1 Model 650, RCD. CH. 17-1 `Iode1 DETROLA PAGE INTERNATIONAL DETROLA CORP. AMPLIFIER WITH OCTAL TUBES Part No. Symbol R-10 R-6 R-2, 3, 5 R-8, 11 C-5 R-4 C-5 A-9528 B-9564-1 Cord, Line Knob T-1 R-1, A-51160-1 B-51318-6 A-51578-2 B-54466-1 B-56029 Speaker, 4 -inch PM 9 SP -1 Cap., Elec., 40-20 mfd., 150 v. (Metal Container) Resistor, 133 ohm, 5 w. Cap., Elec., 40-20 mfd., 150 v. (Paper Container) Transformer, Output Control (Tone and Volume), 500M ohm. AF Amplifier Power Output Rectifier 12SQ7GT 50L6GT 35Z5GT OO 0 0© 2 0 0 O 54 AC 8 40 12 AC O 0 12 AC 9.0 125 54 AC 1L7 4 5 6 0 0 0 118 125 0 - 85 AC 85 AC 7 3 117 AC O NOTE: All DC voltages measured with a 1000 ohm -per -volt meter from B- to socket contact indicated. All voltages are positive DC unless otherwise marked. Volume control full on. Zero input. Tone control in clockwise position. Line voltage 117 volts AC. o 0 1 0 Q o SOCKET VOLTAGES POSITION TUBE 626, with octal tubes Model 626 With Octal Tubes Description Capacitor, .05 mfd., 400 v. Capacitor, .01 mfd.. 400 v. Capacitor, .1 mfd., 400 v. Capacitor, .02 mfd., 400 v. Capacitor, .002 mfd., 600 v. Resistor, 3900 ohm, 1/2 w. Resistor, 150 ohm, 1 w. Resistor, 15 meg., 1/2 w. Resistor, 220M ohm, 1/3 w. Resistor, 470M ohm, 1/3 w. BC31B503 BD410103 BD410104 BD410203 BD610202 BR16C392 BR16E151 BR17B156 BR17B224 BR17B474 A-8948 C-3 C-6 C-2 C-1, 8 C-4, 7 R-7 MODEL 17-3 R-3 220 M C-4 1L. C-6 .002 .01 MFD. MFD s o PHONO PICK- UP 0 CHASSIS C-7 C -I TA02 .02 MFD MFD. C-2 O.IMFD. C-3 .O5 MFD. T-1 C-5 4OMFD. R-4 IL. 20MFD 133 R-7 3900 11 KEY WIRE- NUT SP -1 SPEAKER 117 V AC 60 Z. SW -1 WIRE -NUT Wiring Diagram Model 626 With Octal Tubes (For RE:n Number 3 and Up) ©John F. Rider RLCORJ CHANGERS: www.americanradiohistory.com Int. Det. Int. Det. 550, RCD. CH. 15-1 Model 650, RCD. CH. 17-1 ?AGE 17-4 DETROLA INTERNATIONAL DETROLA CORP. MODEL 7156 .vwOOS 01-8 MMo UOSI 1,'J 6 -LI dV W NT -ïrwOZï 222 vwooi L -LI 8-a 0 t7OT 'CT 93w8*9 941 d LL v93w E.t r -a vW L'IN I OOS 5-t3 ?- - - t 1 wl ml N ol _ -_J 1 V \ 'OQOQQ T -1 I L' I "a I 1E4 I Ú I 3 Z z oa O Y Z V añ ()John F. Rider RECORD CriANGER: Int. Det. Model 650, RCD. CH. www.americanradiohistory.com 17-1 DETROLA PAGE INTERNATIONAL DETROLA COUP. M3DTEL SOCKET VOLTAGES POSITION TUBE 12BE6 Converter 12BA6 I.F. Amplifier 12AT6 2nd DET.-lst AF-AVC 1 2 3 4 5 6 -5 0 24 AC 12 AC 88 88 0 7 0 0 24 AC 35 AC 88 88 0.7 0 0 12 AC 0 0 0 12 50B5 Power Output 0 5 85 AC 35 AC 115 88 0 25\1V4 Rectifier 0 0 85 AC 117 AC 112 AC 112 AC 122 from NOTE: All DC voltages measured with a 1000 ohm -per -volt meter voltON-OFF switch (-B) to socket contact indicated. All AC contact socket to (-B) switch ON-OFF from ages are measured indicated. All voltages are positive DC unless otherwise marked. Volume Control full on. No signal input. Line voltage 117 volts AC. (ID ' p` ti ( °-_` -6 I I C.MM!oN - S", o G-12 C-5 . Ni eoó o t° ° v, R-1 I '' gai C=I SM "' r.OMiD. M2 w..' '.,C 20 WD. g I C- 7] C-3 Parts Layout-Model 7156 SERVICE PARTS LIST Part No. Symbol Description Part No.. Symbol B-51427-5 v. 200 mfd., .05 Paper, Capacitor, BD210503 C-3 13-51427-8 Capacitor, Paper, .01 mf d., 400 v. C-9, C-12 BD410103 B-51576-2 SW -3 Capacitor, Paper, 0.1 mfd., 400 v. C-5, C-11 BD410104 A-51787 Capacitor, Paper, .02 mfd., 400 v. BD410203 C-14 A-54122 v. 400 mfd., .05 Paper, Capacitor, BD410503 C-8 C-1, B-54466-2 R-5 Capacitor, Paper, .003 mfd., 600 v. BD610302 C-13 B-56718-1 T-2 Capacitor, Mica, 100 mmf. BM74A101 C-6 B-56722-1 T-1 BM74A221 Capacitor, Mica, 220 mmf. C-10 B-57262-6 Resistor, 68 ohm, % w. BR16B680 R-2 B-57841-1 Resistor, 150 ohm, Ufa w. R-10 BR1GC151 R-9 B-57842 BR17B104 Resistor, 100,000 ohm, i w. R-8 C-57843 SP -1 BR17B223 Resistor, 22,000 ohm, ' w. R-1 B-57848-1 BR17B224 Resistor, 220,000 ohm, 3,4 w. R-7 B-57857-1 BR17B335 Resistor, 3.3 megohm, 1/s w. R-4 w. BR17B685 Resistor, 6.8 megohm, B-57858-1 BR17E152 Resistor, 1500 ohm, 1 w. C-57859-1 R-3 w. 1 BR17E153 Resistor, 15,000 ohm, R-11 L-4 X L-5 D-57870 Drive Cable, A-2163 C-57872-1 Lamp, Pilot, No. 47 Mazda, 6.3 v. A-6158 A-57878 Light Dial Socket, A-6182-1 B-57879-1 C-2 v. 150 mfd., 40-20 Electro., Cap., B-9564-1 C-7 Clip, Spring A-51163 B-58069-1 ©John F. Rider www.americanradiohistory.com Description Grommet (large) Grommet (small) Switch, Radio -Phono Spring, for Dial Cable Button, Plug Control, Volume, 500,000 ohm Transformer Assembly, 2nd IF Transformer Assembly, 1st IF Cord, AC Phono. Control, Tone & Switch, 500,000 ohm Coil Assembly, Oscillator Speaker, 5x7 PM Shaft, Tuning Drive Pointer, Dial Strip Assembly, Light Diffusing Capacitor, Variable Coil Assembly, Loop Knob Clip, Gang Mounting Capacitor Assembly, Trimmer Cord, AC Power 17-5 7156 PAGE 17-6 DETROLA MoD:3L 7156 INTERNATIONAL DETROLA CORP. TUBE COMPLEMENT 1-12BE6 Converter tube 1-12BA6 IF Amplifier tube 1-12AT6 Detector-AVC-First Audio tube 1-50B5 Power Output tube 1-35W4 Rectifier tube ALIGNMENT PROCEDURE The following equipment is necessary to properly align this chassis: A signal generator which will provide an accu- NOTE: Intermediate Frequency and Oscillator adjustments may be made with the loop disconnected provided a rately calibrated signal at the frequencies listed. resistor of 10,000 to ä0,000, ohms is substituted to 2. An output meter. close the 12BE6 grid circuit. The loop alignment must be done with the loop and chassis mounted in 3. A non-metallic screwdriver. operating position in the cabinet. A single turn loosely 4. Dummy antenna: .1 mfd. RMA loop. coupled to loop may be substituted for RMA loop. 1. - - GENERATOR CONNECTION 1F 455 kc. 12BE6 grid 1620- kç; 12BE6 grid RMA loop 1-100 kc. Through loops RMA loop * AT RADIO DUMMY ANTENNA .1 mfd. i DIAI. TO TUNE TRIMMERS REMARKS HF end IF trimmers Tune to max. HF end Osc. trimmer B Set limit of band 1400 kc. Ant. trimmer C-2 Tune to max. CDEF Loop trimmer accessible through back of cabinet. D a] Mechanism V.C. Impedance Tube Layout 3.2 ohms at 400 cycles ©John F. Rider www.americanradiohistory.com DETROLA PAGE INTERNATIONAL DETROLA CORP. 91001 17-7 MODEL 7901 LC.8 9-8 9 -leb 4.1 o .f O r r 83380 O. 9 Of -a 9191119 Y 9 2s -- I 9C Ey 038 I Dill 1 f_ 931.41 " t- eZ-a VV V u QN o o SZa 91£[ 000 SE¡ -0 £Z-8 woe 038 14Off`Zf Z 91Z 61 ZZ -a ó °' r 0 º a 91028 12-61- ó a E To 00-0 ZO E- '[©'eOLZ óY t2-LL i>a o 111 01,r0 Q r O `%.oQo1m QQ9 r E O 80-8 )101 3WW o !C-0 10 9S O Ó 2 X2 °ó 9S r LI hl n_ , 1(-1A \N `o 1v 43.) 4 A// ` F I FQyI/ u j3ß15o ,;(5-or -_ 3(119 £1 a olo '1.1 1E-** n .'- 1 3IINOCCI .LRi(4 Ua> 22 61-0 6-8 91e e U6 l MN 00 Oi 8-ö rÑ>: 's3C- gi MZI I -i E71í -F º 0 o ®6 9 md r Ja n U O '-X4E441i ali ,3,1n01 U O92Ì 8-Q3 -ö 022 I-8 7,2O ^úo U 6Z II 3(119 VII l9 o l9 4W 011,8 W J ÿ O U t. > \N o .3 ALCORD CHANGERS: John F. Rider www.americanradiohistory.com Int. Det. Model 650, RCD. Int. Det. Model 7000, RCD. dii. Cu. 17-1 17-14 dcheffieficti // \\ PAGE 17-8 DETROLA MODEL 7901 INTERNATIONAL DETROLA CORP. '93211 1 92-tl _YK S2Y ( j2112.7 -12n. 9[-J .. 20 9[-0 eoa " O[[ .2121 f04y 9922-9 ..,. sE t '. 20 00-3 In 90 et-tl g !I -Y 1--- `~1t 3 1. .000, u21 13i Q9º 000 Qr iF-;`,s' ) >903 ` n"1_( r1 ` 4p0 j,006l<, . 11-+ ` I FN , ;-_ ri TV e. a Lo n afa ©John F. Rider www.americanradiohistory.com DETROLA PAGE 17-9 MODEL 7501 INTERNATIONAL DETROLA CORP. TO TERM. NO2 ,--- (FRONT-SECA) ON BAND SWITCH TO CHASSIS GROUND ,--TO FM Rt.- /TRIMMER BRACKET (GROUND) FM OSC. SHUNT TRACKING COIL-\ TO FM ANTENNA 'TRIMMER BRACKET TO TERM. NO. IO (GROUND) (FRONT-SEC. I ) ON BAND SWITCH TO "AM" TERM INAL TO TO AM OSC. SHUNT AM ANTENNA TRIMMER TRACKING COIL -TO DIPOLE ANT TO AM RF TRIMMER TERM. BOARD (END"FM"TERM) TO TERM. NO. IO (FRONT -SEC. 2) ON BAND SWITCH TO FM RF TRIMMER / AM RF COILL -3C AM OSC. COI L TO FM ANTENNA TRIMMER L-3B FM ANT. COIL COIL L-30 FM OSC L-3F FM RF COIL L-3A AM ANT COIL TO FM 0SG TO FM OSC. TRIMMER BRACKET (GROUND) TRIMMER Permeability Tuner Illustration ® ®® ®®® a e ® ' r+ -_ 1VI. o ® R-17 _ '1 1e . ---.",:.e¡`- `,-riz1;_ Fia RD .., '+,.14 /re, F.... ; ri et: 6R,`.o kk `I`_ !.A_..2/ii_ wit 9 ID®® rb CID ® ® ® O Rrí2. *10% TOLERANCE 1sMFD pp ®ID It ®®® ®® ® CA 411:t , 5 MIA ! 101. View- Ports Layout Rider www.americanradiohistory.com C-18 ®® 1400 PPM LOCATED ON TOPSI E OF CHASSIS FM OSCILLATOR TRIMMER BRACKET TRIMMER, C -I2 0 FM. OSCILLATOR BETWEEN 1GROUND) Bottom F. p .C-39 wíirD ® ®0 TYPE ( ©John , ®_. . '-- ® 111, ®®pL.. ® C32 1-32.11(E MODE 17-10 gy DETROLA L DETROLA CÒRP. INTERNATI 7901 1g a O M. E 6 É . K Cbe ñ á m O E 'k. E t.-. a.. E á 4E .. ^F ,g6 aE, Yg N á 9; a x.w. kr Wa Ñ V Ñ w añ x ¡y Ag 4 9 BB á é c s g .. y ú > pp m V x a E.°e- E. :a.. ppF VU'z Uz i .á u 0 á ñLC. . 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F 3 â ma E 2; o M z m 'º 4 .9 X 0 wo mNG$ go E c w b -d o i K ñ 3 1: 3 'E É C Ó G:" ÿ lr .+ >. á v ÿTM m `a Ñ 0. o EE ô W ó' a a ° íé &w ." m aqi 7 ÓO g r. ° a E 5 > a> a E m^ o Ñ E ó : E o á .rE ° ' á m a .a d I.. o K +a o .c B o m www.americanradiohistory.com . z á " a N ai ú 'C , á cF F - R a m ú G G Á. .0T ° g > F x ` á oA ó «. G 9p Rider i á ÿ W a °' m z. -.0=1.i.41 E w F. g, 4° 3 m > i x óp 7 ^ w :. ÿ c u '1,32e..1-5 o ? d ++ .m. ao m m ô N Q F eso.+ E ú a o " E ú o v' ó 8 á O RI ä w.+ m c `aoi zd- á óEa°d^ á`v º p..+ .«° ° áo ró> .. .s F. " $ ,, ° ° y « ° F 000gopppp é a x 4 á E eo ' A rd a ,c Á 7-'-'-E- m . á :.57i...,'42. :9':',-A.13&/ a°i a .a .. m. eo_ 33w " yqy á_ ídE 3 w d> o § g ÿ m2 ó v '° ° m I x C ..b i E id c. E;M 6 6 FO d Qt ,ymXp o Laú GFzKw2. °eoepa ÓE aç á 4 d á ~ W M ÿ p°m > 7 m N a a a a p.Y p G Io 13.4 o ei . j ©John E a Ñ m éo ái E 9 Ó Ñ á á °, rd É 17-11 DDEL 7901. PAGE 17-12 DETROLA INTERNATIONAL DETROLA CORP. 90 Part No. Symbol A-6158 B-51524-4 B-57922 L -3A, 3B, D-57920 3C, 3D, 3E, 3F, and L-5 A-59316-1 R-39 B-55513-1 R-3 BR16B470 R-17, 23 BR16B560 R-22 BR16E271 R-4, 11, BR17B222 Description Symbol Lamp, Pilot No. 47 Lead, Shielded Link, Band Switch Permeability Tuner Assy. Perm. Tuner Assembly (on exchange basis only) Pointer, Dial Resistor, 3.9 ohm, % w. Resistor, 47 ohm, ' w. Resistor, 56 ohm, ifs w. Resistor, 270 ohm, 1 w. Resistor, 2,200 ohm, % w 19, 26 R-5 BR16E682 R-24 BR17E103 R-8 BR16E123 R-32, 33 BR17B153 R-9 BR17B223 R-6, 10, BR17B333 Resistor, Resistor, Resistor, Resistor, Resistor, Resistor, 6,800 ohm, 1 w 10,000 ohm, 1 w 12,000 ohm, 1 w 15,000 ohm, Y3 w 22,000 ohm, ifs w 33,000 ohm, .% w Part No. A-51729 A-54848 Bushing, Shaft Bushing, Strain Relief A-58341 Cable, Dial BD610502 C-33 BD610102 C-42 C-22, 35, BD610103 37 C-23, 29, BD410203 30, 36, 39 BD210503 C-26 C-31, 45 BD410503 BC31B503 C-4 BD210104 C-3 C-24, 34, BD410104 40 B-57942-1 C-1 C-19 B-58802-11 C-5 B-58801-18 C-20 B-58800-27 C-7 B-58803-16 C-43 C-17 B-55520-1 A-57950 18, 25 BR17B473 BR17B104 Resistor, 47,000 ohm, % w. Resistor, 100,000 ohm, % w... R-1, 7, BR17B224 R-16 BR17B334 R-21, 30, BR17B474 Resistor, 220,000 ohm, % w... Resistor, 330,000 ohm, % w... Resistor, 470,000 ohm, lis w... R-27 R-2. 20 37 31, 36, 38 Resistor, R-15, 28 29 R-13 BR17B105 BR17B685 A-51801 B-55280-1 B-51469-3 A-57996 A-54726 A-51403 B-55180-3 1 megohm, w..... ors Resistor, 6.8 megohm, Rivet, Pronged Shaft, Drive Socket, Dial Light Socket, Miniature pis Socket, Octal Socket, Speaker Spacer, Metal A-51787 A-50147 Spring, Cable Spring, Conical T-3 B-57954-1 T-5 B-57958-1 T-7 B-57963-1 T-2 B-57972-1 T-4 B-57976-1 T-6 B-57994-1 Transformer Assembly, 1st IF AM Transformer Assembly, 2nd IF AM Transformer Assembly, 3rd IF AM Transformer Assembly, 1st IF FM Transformer Assembly, 2nd IF FM Transformer Assembly, T-8 T-1 B-57997-1 C-57934 ©John F. Ratio Det. Transformer, Output Transformer, Power Description BM74A102 C-8, 18 BM64A911 C-11 C-21, 27, BM55A331 32, 35, 38 BM74A221 C-16 BM74A151 C-28 BM74A101 C-6 B-58902-11 C-41 Capacitor, .005 mfd., 600 v Capacitor, .001 mfd., 600 v Capacitor, .01 mfd., 600 v Capacitor, .02 mfd., 400 v Capacitor, .05 mfd., 200 v Capacitor, .05 mfd., 400 v Capacitor, .05 mfd., 400 v Capacitor, .1 mfd., 200 v. Capacitor, .1 mfd. 400 v Capacitor Assy., Trimmer (3 sec.) Capacitor, Ceramic, 5000 mmf., G.P. Capacitor, Ceramic, 100 mmf., G.P. Capacitor, Ceramic, 47 mmf. (-750 ppm) Capacitor, Ceramic, 15 mmf. (-1400 ppm) Cap., Electro., 4 mfd., 150 v Cap., Electro., 30-30-75 mfd., 400 v.-20 mfd., 25 v Capacitor, Mica, 1000 mmf. Capacitor, Mica, 910 mmf Capacitor, Mica, 330 mmf. Capacitor, Mica, 220 mmf. Capacitor, Mica, 150 mmf Capacitor, Mica, 100 mmf. Capacitor, Mica Mold., Type Q, 56 mmf Capacitor, Mica Mold., Type Q, 47 mmf Cap., Trimmer, 10-25 mmf Cap., Trimmer, 1.5-14 mmf. Clip, Capacitor Mtg. Cup, Spring Coil Assy., R.F. Choke Coil Assy., Series Track. C-13 B-58900-6 C-2 C-12, 15 L-10 L-9 B-57939-2 B-57939-1 B-55260-1 A-57925 A-57931 B-57933 L-4 B-57929 R-14 B-58219-1 R-12 B-58218-1 B-57262-7 B-58069-2 A-57999 1 megohm (T.C.) Control, Pot., 2 meg. (V.C.) Cord, AC -Phono. Cord, Power Crank, Switch Lever A-59321 Flywheel, Tuning Shaft B-57998 Hub Crank Rider www.americanradiohistory.com BC Osc. Coil Assy., Shunt Track. BC Ose. Control, Pot. and Sw.,