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l2 MJC/UNE equalized inputs with echo sepd
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4 Outputs pfus Stereo or Mono mix.down outputs
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XLR connectors Complete capability for Recording and Broadcast · Studio production applications.
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The Langevin am4a offers quality, flexibility and economy in a sophisticated sound mixer. The building block concept of the am4a lets you buy the channel combination you need. Just unpack, connect your input and output lines, drop in the modules ... and you're ready to go.
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Each block is a pre-wired, plug-in module. Preamplifier, line amplifier modification groups, and multi-channel gain control modules are available... and each channel provides true fidelity of sound. The unique housing assembly is pre-wired and ready to accept standard Langevin modules ... offering a variety of functional capabilities tailored to the individual's requirements.
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am4a HOUSING The functional low silhouette design of the am4a mixer equips the operator with a convenient sloping work panel. Its overall height is 7 inches ( 17. 78 cm) and depth is a compact 27 inches (68.58 cm). The housing is 45¼ inches wide ( 114.93 cm), and will accept 19 modules. Blank panels are used if the total number of modules does not completely fill the available housing capacity.
OPTIONS
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PROGRAM AM-419AC Booster amplifier providing four rotary level controls, has gain of 24 dB for four-channel operation. Primarily intended as booster stage to provide balanced +4 dB monitor output of AM-407-type amplifier. MG-71 Passive 8-to-1 combining network with eight individual input level controls, and two groups of four pushbuttons that allow selection of input sources. NOTE: This module is designed to operate with a nominal input level of +4 dB and has an insertion loss of 40 dB. It must be to1'1ow~ by an AM-407 amplifier, or any -j? device with similar gain characteristics, in order to recover the insertion loss of the combining module. MG-81 Passive control module with four rotary potentiometers. Primarily intended to be used in conjunction with AM-419AC booster amplifier in situations requiring separate monitor level controls for control room and studio operations. _ ..---. \IISCELLANECUS AB-4 Blank panel to fill in unused module space. Mounts same as normal modules.
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) CONSTRUCTION FEATURES Pre-wired circuitry and a solid state power supply within the mixer assembly provide the necessary interconnections and power requirements. The standard am4a has twelve input modules with full equalization and reverb send facilities. It is equipped with a four-gang board master and stereo and mono mix-down capabilities. Input and output lines are permanently wired to XL type connectors in· stalled in the rear of the housing. Top quality, fou(~inch. illuminated VU meters are provided.
IMPUT AM-411AS Standard microphone preamplifier, similar to AM-401AS, but providing pan pot instead of solo pushbutton. Output assignment switch is prewired and marked for the following functions: Pos. 1 Output assigned to Channel 1. Pos; 2 Output assigned to Channel 2. Pos. 3 Output assigned through pan pot to Channel 3 and 4. Pos. 4 Output assigned to 0-Bus. · All switches may be down at the same time, facilitating a microphone feed to Channels 1, 2, 3, and 4. The pushbutton in position No. 4 is electrically interlocked to disconnect the ~utput of the preamplifier from the bus system, applying signal to the 0-Bus only. AM-449AS Passive input module designed primarily for broadcast applications. Will accept two groups of stereophonic input pairs at nominal level of +4 dB. Provided with four bridging input transformers and input selector switch. Includes dual st raight-line mixer and OF F-AUOITION-0 switch. NOTE: Tv.:o groups of four pushbuttons each are provided to assign each of the two output channels to any com....,,.. bination of four program buses. This module contains no equalization or reverberation facilities, since it is primarily used in conjunction with tape or disc playback facilities.
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AS Equalizers
lQUALIIATION
arn"la mixar modules
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OUTPUT ASIIGN
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AM-401AS
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OUTPUT ASSIGN (push-push). Not interlocked .
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SOLO (push momentary). For rehearsals. When depressed,all channels go dead except the one with the depressed button.
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DEGREE OF HF EQUALIZATION (rotary) 12 dB boost or attenuation
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boost peak frequency. 50 Hz, 100 Hz,
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~:~~EE OF LF EQUALIZATION (rotary) 12 dB boost or attenuation
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HF (interlocked) Selects HF equalization boost peak frequency. 3, 5, 10 kHz.
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REVERB SEND (stepless) NOTE: OUTPUT ASSIGN switches, top of panel, switch reverb and program.
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AM-407AS
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AM-439A
1 AM-407 AS Program Module Line amplifier with nominal program output of +4 dB; maximum output +22 dB. Amplifier has transformer coupled input and output and is provided with straight line submaster control and reverberation receive circuit. Reverb circuit has rotary level control and three.position, interlocked pushbutton switch. In the first position, it is possible to disable the reverb receive circuit; in the second _position, to feed the reverb signal to the monitor circuit only; or, in the third position, to feed the reverb signal to the monitor and program channels simultaneously. NOTE: A small feedback amplifier is provided as a booster for the reverberation-send line. The AM-407 AS has a fixed gain, thus requires no control. If applicable, the board's master control is connected to the AM-407 AS amplifier circuit and performs in conjunction with the sub-master control, which is located in the module's front panel.
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AM-401AS
Talkback module. Fits into left trim panel of console. Permits slating, with or without tone, and talkback into studio monitor system.
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REVERS POINT, Band A (interlock) Before or after mixer control.
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AM-4298
AM-439A A combining module designed to provide a stereo mix· down derived from the four main output buses of the am4a. Push-button switches allow the operator to select from any combination of the four main busesand four pan pots are used to place the selected signals to any position between the stereo outputs. Left and right stereo amplifiers provide unity gain output when the pan pots are in full left or right position. AM-4298 Mono Mixdown Module Amplifier with 4-to-1 combining network primarily for use as monophonic feed from the four-channel output of console. Provided with rotary mixer for each input channel and four-position pushbutton switch, allowing for the selection of feed points. Provided with rotary output level control as well as output indicating meter. ~'ilG-G1/4 Mas1er Control
Passiveboard master control module that is designed to control output level of four AM-407-type line amplifiers on one control.
TYPICAL OF FOUR -
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AM-407 AS
ON CONSOLE
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(11\ Jm4a TECHNICAL SP!:CI FICAT:ONS
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Source Impedance
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Level
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Power Requirements
Impedance ~
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250 ohms nominal.Balanced
Line lSK ohm.
60 dB signal to noise can be maintained with input level as low as ·62 dBm. Proper operation of input attenuation buttons prevents overload with levels as high as +27 dBm. Any signal ranging from low level microphones to outputs of lines or tape recorders may be accommodated. 45 to
so voe
at 35 ma for each AM·401AS
module.
Level
Frequency
Response Distortion Noise
Power Mains Dimensions
Normal +4 dBm. Maximum +22 dBm
LF or HF equalization,±
ot Computer Eou1pment Coro
13035 Saticoy Street North Hollywood, California 91605 Phone: (213) 875-1900 TWX: 9104992669
::UROPEAN OFF,CE 1.0 dB, 20 Hz to 20 kHz.
Not over .5% over the range 30 Hz to 20 kHz at output +20 dBm. Not over .1 % kHz at +22 dBm. Without LF or HF equalization, Input equivalent.
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Route 4, Devens Drive Brentwood, Tennessee 37027 Phone: (615) 794-0155
600 ohms balanced.
Without
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OUTPUT
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Microphone,
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level of
not to exceed a level of ·122 dBm
Cetec U.K. Shaftesbury Street High Wycombe, Bucks, England Phone: High Wycombe 37326 Telex: 837329
105/130 or 210/260 volts 50/60 Hz (Specify Voltage) Height Width Depth Weight
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7 incnes (17.78 cm) - 451/• inches (114.93 cm) - 27 inches (68.58 cm) - Approximately 125 lbs. (56.70Kg)
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CL·006•1173 PRINTED IN U.S.A.
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WARRANTY
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Langevin guarantees this material and worloianship of manufacture. Exceptions
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p~oduct to be free from defects of for a pe:riod of one year from date assumes no responsibility damage •
1)
Langevin shipping
2)
Carbon-composition controls for ninety days after first
aTe guarant~ed use.
3)
VU meters are warranted date of shipment.
four weeks from
4)
repair or Warranty is void if unauthorized modification has resulted in d~~age or in deterioration of performance.
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Within the guarantee periods, Langevin will replace or repart of the AM4Asystem at no cost to the purchaser pair·any or user except for his payment of one-way transportation to the factory at Santa Ana, California.
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S HI P P i NG DAM AG' E No containeT that shows visible external damage should be unpacked, except in the·presence of an official of the carrier (who should sign a statement as to nature of d~~age). If concealed damage is discovered within any unpacked conexternal damage, the carrier tainer which showed no visible should be notified illL~ediately. An official should inspect, and sign a statemeht as to the nature of the d~~aga.
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The Interstate Con,m~rce Commission has indicated that a carrier is as much responsible for concealed damage as for visible
Please
damage.
notify
Langevin
of any shipping
RE G I S T R AT I ON OF
damage.
P URCHA S E
If you have purchased this equipment through a dealer (or through any supplie.r other than the Langevin factory), please notify the factory of your purchase in letter form. This will place youT name nnd address on the list for receipt of chanio notices and additions to this booklet.
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F u S ES Thare are two fuseholders on the chassis of the power supply (which is under the top covar of the housing). They are marxed AC and DC. If the AC fuse fails,
all
power will
be removed from ths entire
assembly.
If the DC fuse fails, amplifier power will but the meter lamps will stay on.
ba removed
B~ sure and replace fuses with values as indicated on tha supply chassis. Turn off power befora removing or replacing a fuse. Although years may go by before any fuse fails, keep spares handy. Why not tape boxes of fuses of the housing cover?
PORTABLE ~ ~
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AM 4 .4
Although compact, the AM4Awas not designed to be a truly port· able unit. In particular, the frame of the housing is not sufficiently braced to withstand rough handling. It is suggested that, if an AM4Ais to b~ made p~rtable, carrying case be constructed. · This case shpuld. totally·
a enclose the housing and should have padded supporting sections. The · cover should have padded inserts that bear against the panels of the plug-in modules so that they will not loosen with vibration. When using generators recQrdings Modules.) back at tha
the AM4Aon location, small portable reverbaration can be connected for monitoring purposes only, and made "dry". (See specifications for tha Output Proper reverberation can be added during remixing studio.
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FACTORY
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The Langevin factory will an AM4Aat moderate cost.
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'SERVICE repair
and/or
refurbish
any part
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It is recommended that you save one or more of the packing cartons fo~ the modules so that this material can be used ~hen returns are made. Please
correspond
with Langevin
before
raturning
equip~snt.
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THE A>~.;,; MI~ct< IS
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.A. MODULARASSEMBLY that
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in a great number of different ways. It is unfortunate thdt no concise set of instructions can possibly be written that remains readable while covering all the variations that can exist. In lieu of an instructions book, it is requested that you read the enclosed material which outlines the characteristics and specifications for the individual modules. Also enclosed is a section for the housing of the AM4A. It in housing wiring that makes one system is the variations different from another.
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If your system has any special modules ... or any modifications that are not considered to be 11 standard" ••. you will find the pertinent sections enclosed.
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Regardless of th~ possibly unique properties of your particular AM4A, there are certain comments that will apply. Indeed, most of these comments hold good for mixing systems in general •.. not just for the Langevin AM4A. Please read the section below:
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0 P E RAT I ON
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Input Modules and Preamplifiers ar~ often overdriven, resulting in distortion. The AM401 Input Modules have inbuilt Input Attenuators, a 4-key interlocked push-switch (0, 20, 40 and 60 dB). The proper key should be selected so that overdrive does not occur. The
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Any time
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on an Input Module must be run further CCH than about 11 30 11 in order to maintain proper Vu meter level, over-drive is ... and the next higher Input Attenuator probably occurring button should be pressed.
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Input over-driva f 1 a $ h i ng
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VU METERS
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Do not allow Vu Meters to bang their pegs continuously, as this will only result in distor-
tion being generated. The proper l2vel for pro9ram exists 11 when th,~ pointers approcch 0a 0:1 th2 seal es fa i rl: 1 of ten J but go into th~ r9d portioil3 only about on-:c p~r tP.n :~c(:ir.ds. (In public-address work, output level monitoring s~ou1d be primarily by the level cf tha sound in the house4 Vu met2rs indicators.) are secondary-standard
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The best way to use variable equalizers is: A3 Zittle as possible. They should be considered as crutches that are resorted to only if proper choica and positioning of microphones fails to achieve the desired EQUALILERS
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The equalizers from ringing.
A studio that is equipped only with 11 flat bably cannot avoid use of the. equalizers. following comments may be of interest:
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Some bass jnstruments that fall off in acoustic output at the extreme low end of tha spectrum may benefit from boost at 50 or 100 Hz. In particular, small bass fiddles often require low-frequency augment~tion. Also, rolling off the highs on a bass fiddle mike may help to reduce string slap.
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1000 Hz equalization boosting may help to maintain uniform speech and dialogue characteristic, and should be introduced as the actors distances from the mike decrease.
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N~TE: The 1000 Hz peaking equalization on the AM401 Input Module cannot be used with any other peaking frequency. In other words, do not attempt to boost at 1000 Hz and 3, 5 or 10 kHz.
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Try to avoid use of high-frequency equalization that boosts at 10 kHz or above. If possible, add brightness only in the 3 or 5 kHz region.
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The six push-keys mar~ed 3, 5, 10, 50, 100 and 1000 on the AM401 have nothing to do with tha response of an equalizer 1n the roll off mode. They select boost peaks only.
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H O US I rJ G S BASIC HOUSINGSFOR THE Af':14/\ MIXER SYSTEMS, TWOLENGTHS, WITH RESPECTIVE CAPACITIES OF THIRTEENANDNINETEENPANEL MODULES.
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POSITIONING ['10DULES To
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place a plug-in module in its panel position: 1) Loss en thumbscrew at top. 2) Engage nylon bushing at lower end of module with the 3) Carefully lower the short retaining stud i~ the housing. module into position, meshing the module connector with the housing connector. Never force a module. To remove a module: 1) Loosen retaining thumbscrew at top of module. 2) Using the thumbscrew as a pull handle, raise the top of the module until the connectors disengage completely. 3) With your other hand, grasp one of the knobs on the module panel. 4) Remove the module with motion upward and toward the meter panel.
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Do not remove or insert
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HOUSING SIZES
The walnut end-sections are identical for . both sizes of housings ... and are slightly larger than the cross-section of the metalwork. They measure 27 1/2" (from front of armrest to rear of sideapproximately piece) by 7 1/8'' (overall height of side-piece, not including distance the entire housing is raised off supporting desk by its feet). The AH21/13 Housing (thirteen 32 1/8" wide, overall.
panel
modules)
is approximately
The AH21/19 Housing (nineteen 45 1/4" wide, overall.
panel
modules)
is approximately
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The AM4Amay be placed MOUNTING THEHOUSING desk, table ·or ped~stal.
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on any suitable Rubber feet 1/4" above the mounting surface support the housing approximately scratching furniture-type finis11es. Should you desire to prevent constructed console, you to recess the AM4A into a specially a flush assembly. may want ~o remove the front trim to realize This trim is fastened by 4 or 6 machine screws accessible after removal of all modules.
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Page
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If you are planning to use the bottom access holes for installed in cable lines, or if you have XL-Connectors ~s required to reach these positions, a table cut-out these points. It is also possible to have the housing assembly protrude 3 inches past the rear edge of the table to gain access to the bottom connectors.
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CONNECTir~ THE AM4A
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If you ordered your Mixer Assembly all without XL-Type connectors, to the applicable terminal boards.
MICROPHONE INPUTS are always in multiples of 8 inputs per terminal board. The terminals marked "l '' and "2·" are balanced transformer .inputs, "CT" .is the transformer center, and ''S" is the cable shield. The ''S" terminal is grounded to chassis at the terminal board location.
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boards accomadate 4 lines per The "INCO~IING LINES" terminal ~oard. Two sets of terminals are provided for each 1ine. The ampljfi.ers are always connected to the terminal pair toward the VU-Meter Panel, leaving a set of 4 terminals available for a level pa
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461AS, 421A, 401A Useu on - 401AS, 431A, 431AS. 441A,441AS, 451A, 451AS Wiring side of connector, CKT side of CKT BD Shown DO NOT USE blank connector pins Pin 6 is Direct Output, nonnally not used
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This amplifier assembly is primarily intended for use in the AM4A and AMBA mixing console. It can be used in any other custom 1here assembly 1.,., its performance characteristics and inp7!-t/ou_tput - parame ter,s serve-·t~-~ necessary functions. If used with the· abovementioned mixer assemblies~ the type AM401 amplifier module becomes part of the sloping panel area of the composite system.
~
AM401A
Rotary
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mixer with
equalization,
reverb
send,
and solo
switching.
Ai\142lA
Sarne as above but with
additional
off/ cue/PRG switch.
~
~ ~
~
AM431A
Identical
to Model AM401.Abut without
equalization.
to Model AM401A b uL without
reverb
AM441A
~
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Identical
send
circuitry.
AM451A
Identical to Model AM401Abut without send circuitry.
and reverb
equalization
At\146lA
Identical comoatible ..
to AM451Abut with off/cue/PRG with Model .AM421A).
NOTE: Straight
Zine mixer versions are avaitabZe by adding the designation.
switch
(switching
of most of the Zetter "S 11 after
above moduZes the moduZe
r' ~ ~ ~
Most type switches.
•
~ ~ ~
~
AM401 amplifiers Consult factory
may be provided for details .
with
cue
THF AM421AIS NOT AVAILABLE WITHTHE STRAIGHTLINE MIXERDUE TO LIMITED FRONTPANELSPACE.
~
ELECTRICALSPECIFICATIONS
('S'\
All of th~ input modules described above are modular sections cf the Langevin AM4A and AMBA assemblies. The following specij'icat-::ons are given for purposes of reference and as guidelines if these modules are us~d in custom assemblies.
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INPUT IMPEDANCE:
Approximately 2400 ohms regardless of status of input attenuator. Mqy be driven from any source ___ impedance be tween 5-0 · and 600--ohms .: Design center is 250 ohms.
INPUT LEVEL:
Maximum minus 20 dbm at 1000 hz with equalizers flat and input attenuator on "O". Signals as high as +30 dbm may be applied position wilh the 60 db attenuatqr depressed.
GAIN:
Input
Zeve l of m·irzus 5 6 dbm at 1000 hz will develop approximately 15.5miZlirvolts of signal at the high impedance mixer buss ~ith the mixer at "O" attenuation. A higher level output may be made available at customer request.
FREQUENCY RESPONSE:
See attached
sheet.
HARMONIL GENERATION:
See attached
sheet.
NOISE GENERATION:
Minus 122 dbm equivalent from 20 hz to 20 Khz.
POWERREQUIREMENT:
45 volts
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,.. OPERATIONAL DATA
,f9>i
OUTPUTASSIGN SWITCH:
~ ~ ~ I
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t"
rm'
Four independent switching direct send.
push-push buttons, program and reverb-
~ ~
~ ~
~ ~
.~ ~
OPERATIONAL DATA(Continued)
•
SOLOSWITCH:
Single sp.ring-~eturn button. Pressing soZ.o button causes alZ input modules button) to (except one with depressed go dead. Useful du.ring· setup, but dv not use during prog~am-feed time.
INPUT ATTEN. SWITCH:
Four buttons,
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REVERBERATION SEND: (see note # 1)
switch; Selectable with three-button OFF - B - A. (The Band A stand for before and after the pr-ogram mixe~ cont-pol).
STATUSLAMP:
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To be loaded
600 ohma.
with
1
'0''J
at
"10''
·:;!"',:; o~.:t-
ba approx-
"" ~
r,,,.. ~ ~
~·
Mod;ule that is not interco:mected with an Board Master Control should be fitted with a fixed divider at the female connector (part of the AM4A Haus ing) .. This divider should total 10,000 and the output tap should be at -10 dB. The following is sufficiently accurate:
Any AM407A Output
external resistive
Pin 15
~
Pin 13
~
~ ~
~ ~
~
Pins
12/20
Mono p hon i c v er s i on s of the AJ·H:\ w; 1 1 be e q u i pr, e d ,.;i th t rl~ fixed resistors sho~n above in lieu of a Board Master Control unless the monophonic assembly is such that there are Sub Mas t er cont r o ls ( for g r o ups of mi c r o_phone s ) p 1 us a Bo a r i
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SCHftJATIC.
A',f407 ::-:.- .. ~""=. I ·!JN.,___ __.,,__ J..ltlt....ilULJ.Qt; I
L ANGE VI N
AM457A 0 U T P IJ T
MODUL E BOOSTERAMPLIFIER, ROTARYGAIN CONTROL,OUTPUTMETER, PROGRAM LINE ON/OFF SWITCH
Plugs into the AM4A housing, and beaomes pa~t sloping paneZ area of the composite system.
of
the
This amplifier is electrically identical to the Program Section of the basic AM407Aamplifier. Reverberation send and receiving facilities as well as monitor outputs are not provided. A small VU-Meter on the module front output level of the AM457A amplifier.
panel
reading of "0" is equivalent to +4 VU if output is loaded with 600 Ohm.
A
r-, ~
~• ~
This unit may be used to recover the MG71 8:1 combining module.
ELECTRICAL SP~CI FICATI Of'JS
~ ~
~ (11' ~
~• ~
(!P' ~so
~ (F' ~
of
4.5 mV rms@ 100C Hz before clipping, when set foP maximum possibZe gain.
MAXIMUM GAIN
0.6 mV rms 0 cause output load (master gain conti,ol
f'P'. ~
loss
MAX. INPUT LEVEL
~
fR'
the insertion
To be d1•iven fro11 4000 as used ·in the. AV4A.
~
~
I
the amplifier
INPUT IMPEDANCE
(F' ~ \
the
Although this module is part of the AM4A, the following data are stated for reference purposes:
I"" ~
indicates
ohms or
less,
10CO Hz at input wiZZ of +4 dBm into 600 ohm gain control and e:ternaZ set for m·lnimum attenuati:on)
FREQ. RESPONSE
Response enveZope
HA1U40NIC
See attached
OUTPUTLEVEL
+22
NOISE GENERATION
Not over 2. 2uV f2 eferred to input) over range ~o llz tc.· 2f1kHz. · ( 4000 ohm ma:cimum possibLe. input te2"mination,
curve uitl fit over·the range
~ithin a 1.0 dB ZO Hz to 20 kHz.
shef? t.
dBm ma:C'imu.m level·
i,zto
600 ohm 1,oad.
1
Af.145?A
Page
1
of 6
•
~ ~ ~ ~ ~
""' ~
~
•
POWERREQUIREMENT
Must be powered
of
45
V (50
from
ma=.) DC.
max. (Cur~ent modu'Le.)
figure
e~te~nal source Current: 50 mA is for entire
/'f'l.l!>I ~
Any AM457A Output Module that i.s not interconnected with an external Board Master Control should be fitted with a fixed resistive divider at the feraale connector (part of the A.M4A Housing). This divider should total 10,000 and the output tap should be at -10 dB. The following is sufficiently accurate:
l1'il!\
Pin 15 C:
·~
.
a:,
u:>
Pin 13 C: ~
tr,
~
CW')
~
~• ~
('It'
~ ~
(11"' ~
~
Pins 12/20
Monophonic versions of the AM4Awill be equipped with the fixed resistors shown above in lieu of a Board Master Control unless the monophonic assembly is such that there are Sub-Master controls (for groups of microphones) plus a Board Master. NOTE: All input and output circuits transformer-isolated. Neither side outgoing winding is grounded.
of this module, are o~ ~ny incoming or
~ (Ii" ~
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20
30
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100
400
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2
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TYPICALFREQUENCY RESPONSE
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TYPICALHARMONIC GENERATION
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0168
AM457A
Page
3 of
6
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8
REVISIONS
INPUT (MG 71)
SUPPLY COMMON (-)
-t.44 V DC
TO OUTPUT TERML SD
NEXT ASSEMBLY
AM4 MATERIAL
TOLERANCES
USED ON
UNLESS
X
l ±
OTHERWISE
.XX;t
SUIFACI IOUGHRHS
V
NOT~O
.UX±
llllOVE All IUHS AICD SHAIPIOGES.
FINISH
(OK(UfTIICITY WITHIII ltl. HOLDNORMAL lHD PAtALUL FACES WIJHIN PH INCHIll.
SCALE
CONNECTOR RAIL WJRfNG-AM 457 OWN.
av
THA
Cr.ft<. BY ~
DATE f3rEB68
Langevin SANTA CALIFORNIA
ANA
L A i·J G E V I
r~
A ~14 0 9 A/B
DUAL P RE - AMP L I F I E R R I AA- E OUAL I Z E D 2 CHANNELEQUALIZEDPRE-A\fPLIFIERFOR STEREOTURN-TABLEUSE, NO CONTROLS.
To be installed assembiy.
instead
of terminal
board
in the
rear
of the
AM4A
This dual amplifier provides the equalization and preamplification required to connect any magnetic stereo cartridge to the ~i4A mixer assembly input. A 47 K Ohms load resistor is installed on the AM409 circuit card. This resistor may be changed if the cartridge used requires a different load for optimum performance.
of the A\1409 is connected to the ''IN COMINGLINE" board over a resistive network to obtain compatible input levels.
The output
terminal console
The standard resistive network is designed to provide a console output level of +4DBM with 5 mV RMS/1 kHz at the Al-1409 input terminals. Values in this pad may be changed to accommodate cartridges with different outputs provided the load presented to the AM409A is not less than 100 K Ohms; the AM409B may be loaded with 10 K Ohms. Although ELECTRICAL SPECIFICATIONS part of
the ~plifier is the AM4A., the following data are stated for reference purposes:
AM409A
AM409B
INPUT IMPEDANCE:
47K ohms
47K
GAIN:
5mv/1Khz for 10 0 .?. ohms
RESPONSE FREQUENCY
RIA.4
LOADIMPEDANCE:
lOOK ohns
OUTPUTMAX:
5 voZts/lOOX
2170
OU!'Ve
AN409fi/3
160
+
lib
mv/ 5mv/1Khz for 10 Y. chms RIAA aurve 10K
ohms
ohms 580
t. ldb
ohms
5 vo'lts/10K
1 of
ohms
7
mv/
~
(!" ~ ~
~• ~
~
~
rra. (!A,
,.... ~ ~
AM409.4
AM409B
HA&~ONIC GENERATION: Less
than .1% at 5mu/1000 hz
POWERREQUIREMENTS: 45 voZts
DC/.8 ma
Less than .1% at Smv/1000 hz
45 votts
2t" wide x 2~" tong
SIZE:
2¾" uJide z .2t"
M.:..TISG CON.'iECTOR:
Cinch
MOUNTING:
The AM4500 series amplifier mounted ir. TRY-4000
tong
252-10-J0-24D
DC/3 ma
C·inah.
252-10-JQ
.• 2.;D
may be
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INPUT A
©------ ..
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RI
...--",AA,-
4,1K
2
-·· Rt
RIO
IOOI\
4111
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OUTPUT A •.
Rl4
Ill~
IOOII
41K
COUIIOII UUlPUT
OJTPUT D
'..
--41------"'fV\,
I
CC.•.l:J·.:1. l • ·-
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Ill
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OUTl'UT
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+45 V DC ,\
COM
::.'
A •:,
100
k Ohms
"A"
1 k Ohm to input Jo---;.>
-~
AM409A
--II
AM40 lA
--, \ .\
1 k Ohm to jnput
tiI I
\.-----.::"'.··:"'-.::.>
lOO k Ohm~
T YP I CA L CONNE CT I ON F OR AM4 0 9 A
AM401A
N.
•
•
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+45 V DC
0
COM
100 k Ohms "A"
240 Ohm to input AM401
,__
__
.-,1
1----~
AM409B
11
240 Ohm to input
Bu
....
':';-;
100
T Y P I C /\ L C O ~-JrJ E C T I O fl
k Ohms .
F O R A r.fl.J O 9 P.
AM401
(""' ~
~ ~
~• ~
LANGE VI N
AM429B
COMB I HI NG MODULE
('h't
~ ~ (?'\
4:1 ACTIVEMIXER, ROTARY GAINCONTROL,OUTPUTMETER,PROGRAM LINE ON/OFFSWITCH,PUSH-PUSHINPUTSELECTOR WITH INDIVIDUAL LEVELCONTROLS
(Fl!:\ (PA
~
~ ~
~
~ ~ ~
('A
~
~• fR'
~
(1!PI
PZugs into AM4A housing~ and becomes pa~t of the sloping paneZ area of the co~po$ite system.
This amplifier will bridge up to four.program lines with an average level of +4 DBMand provide a monophonic output of the composite of all input signals without loss. All inputs ana outputs are transformer coupled and balanced. The input switch of input sources
the selection of any combination will pemit from four independent program lines. to facilichannels.
Each input channel is provided with an adj. trimpot tate fine level adjustment for the individual input
VU-Meter is provided on the module to monitor to output line The Output "ON/OFF" Switch is electrically pre ... ceded by the VU-Meter to permit level adjustment.
A
of the unit.
ELECTRICAL SPECIFICATIONS Although part of
this module is the AM4A, the following data are stated for reference purposes:
<"' ~
~
INPUT IMPEDANCE
40,000
~
MAX. INPUTLEVEL
+21 DBM
INSERTIONLOSS
0 DB/Unity
(#t\
FREQ.RESPONSE
±.5 DB from 30 H2 to 20 kHz
~
HARMONIC DIST.
Less Lees
OUTPUTLEVEL
+22 DBMMaximum ZeveZ into
NOISE GENERATION
70 DB beZo~ operating
POWERREQUIREMENTS
Must be powered from external of 45 V DC (50 V max.) 50 mA max. Current:
1068
AU429B
~ ~
(11' ~ ~
Ohms, to bridge
than than
600 Ohm Zine
gain
.1% (50 Hz/20 .3% (30 Hz)
kHz)
600 Ohms
teveZ
~ ~
~
<-'It
source
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1
of
4
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L ANGE V I N
TYPE
MG41
SWITCHING MODULE
~
I!" ~
fR'
f1l' ~
~
THE TYPE MG41 SWITCHINGMODULE IS A FOURCHANNEL CROSSBARARRANGEMENT WITH lOK OHMLEVELCONTROLS IN EACHOF THE FOUROUTPUTLINES. EACHOUTPUT.LINEIS PROVIDEDWITH A FOURPOSITION INTERLOCKED PUSHDUTTONSWITCHTO FACILITATEASSIGNMENT OF THE INDIVIDUALOUTPUTSTO ANYONE OF FOURINPUTS.
~
~ f'B". ~
~
ff!!','.
~ ~
~~
~
~
~ ~ ~
~ ~ ~ ~
~
_This switching assembly is primarily intended for use i~ the AM4A and AMBA console. It can be used in any other custom assembly where its performance characteristics and input/output parameters serve the necessary functions. If used with the above mentioned mixer assemblies, the type MG4l switching moduZe becomes part of the sloping panel area of the composite system.
GENERALDESCRIPTION Each output
channel of the MG41_crossbar switching module to any one of the four input channels, four groups of push buttons are however, the individual interlocked, and only on~ position per output channel may be down at one time. The circuitry of this module levels is basically balanced and may be used at signal to be used of -20 dbm and up. The unit is not intended at low~r voltage levels than indicat~d above since shielded wiring is not used, ·and extraneous signal pick-up may cause if this module is used in dire.ct microundesired responses phone applications.
may be assigned
The mixer controls are of a high quality and are designed to bridge 600 ohm lines.
carbon
variety
~
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~
~
~-
~
~
~ ~ ~
1169
MG41
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INPUT NO I lO- J .- HI
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OUTPUT NO I
Pl
I
WIRING~IOE
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LO
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i,;K
OUTPUT ~~0
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L ANGE V I N
MG6 1/
BOARD MASTER GAINCONTROL
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Plaasa ra£ar to the schematic diagram £or the AM407AUodule. You will see that the Program Section's amplifier is divided into three sections.
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R45 (the
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the first
two sections.
The second and third sections are net interconnected on the·~ ·· diagram. The output of the second section ties to the input of the third only through the plug pins. Pin 15 is the output of the second section, Pin 13 is the input of the third, and Pins 12/20 are common.
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a Board Mctster In stereo versions of the AM4A, there is usually Gain Control •.. a ganged multiple poten.tiometer, 10,000 ohms per section. For each section of this control, the high side ties to Pin 15, the low side (common) to Pins 12/20 and the output arm connects to Pin 1.3. Ganged Board Master Modules are available from Langevin under the number: MG61/. (The "/" mark is followed by the number of sections. A four-section gang would be MG61/4.)
f'!J"
ara 32 step rotary All MG61/ "Board Master Gain Controls" controls with a gain reductiort of 1.5 DB per step for the first 28 steps. Positions 29 thru 32 are tapered to infinity.
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Th <.• i n p u t s w i t <.:h w i J l p 0 rm i t th t' ~ 0 1e c t ·i on o t any c omb i.n at ion sources from eight intl<.:pcndcnt program lines. of input Each input channc l is prov i tk•J with :~ ~ c rc~,ilt.
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four rotary level controls output switches. (Push-
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.
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eight independently monitor appli-
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