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INSTALLATION AND OPERATING INSTRUCTION
FOR M·6035 CUE.INTERCOM AMPLIFIER
GAIN:
FREQUENCY
RESPONSE:
HARMONlC
DISTOKTlON:
NOISE:
SOURCE
IMPEDANCE:
OUTPUT LOAD
IMPEDANCE:
MAXIMUM INPUT
LEVEL:
MAXIMUM OUTPUT
LEVEL:
MAXIMUM OPERA·
TING AMBIENT
TEMPERATURE:
MAXIMUM STORAGE
AMBIENT
TEMPERATUKE:
POWER REQUIRE·
MENTS:
TRANSISTORS:
SIZE:
TECHNICAL DATA
86 DB ±2 DB
@
1 KC
Variable· Requires 10K varia·
ble resistor. (Part of Console)
Peaked for maximum intelli·
gibility
Under 4% at +28 DBM ( 6 W)
at mid-,band frequencies
·-105 DBM equivalent input
noise
45 Ohms
45 Ohms. (High Impedance
Speaker)
·-40 DBM
+30 DBM
55' C (131' F)
85' C. 085' F )
-37 V. DC (unregulated)
10-/5ma
1 - 2N214
3 - 2N1414
1 - 2N5087
2 - 2N1l83
1 - 2N5088
3-1I4"Wide x 7-1/2"Long
x 1" Thick
DESCRIPTION
The Gates M-6035 Transistor Cue-Intercom Ampli-
fier is designed to be used in hansistOl consoles
for cueing and talkback purposes The amplifier
utilizes a gain control for adjusting to different
input levels. The amplifier is designed to be fed
from a 45 ohm source and to operate into a 45 ohm
speaker or resistive load,
The amplifier is designed to be used with the
M-6039 mouuting frame, which carries a mating re-
ceptacle for the printed card type connection The
connections on t.he printed wiring board me gold
flashed for positive connection with the gold con-
tacts on the mating receptacle
The amplifier requires a -37 V DC unregulated
power saUIce and requires hom 10 rna. (at aV8Iage
power output) to a maximum of 75 rna. (at +28 DBM
output)
THEORY OF OPERATION
For the purpose of explarlation, the Cue-Intercom
Amplifier Can be considered to be made up of two
distinct parts: The preamplifier, and the power
amplifier.
THE PREAMPLIFIER
The two stage preamplifier is driven by an input
transformer which is somewhat loaded by the in-
put resistm, This resistor prevents excessive
signals from being developed by the speaker at its
resonance frequency, which would over-chive the
input stage Both stages are of the common emitt81
configuration, with direct
c~)Upling
utilized
b~t\;\'een
the stages. On the schematIc, 837 9345 001, It
should be noted that Q1 is a NPN type transistor
and has its emitter returned to B- for biasing pur-
poses,
Biasing is accomplished by a combination of volt-
age divider and emitter resistance as with Rl, R2
and R5 This method of biasing also insures a high
degree of temperatme stability Signal degenela-
tion is also for Q2 by R7.
The volume control, (located on the console) situa-
ted between the preamplifier and power amplifier,
is cormected in reverse, to maintain the high
source impedance at all settings that the power
amplifier requires
THE POWER AMPLIFIER
The output stages of the power amplifi81 operate
Class B, and are ananged in the circuit configUla-
tion known as I1single ended push-pull ", or
~Ifollow
ed emitter fallowEH
n
The upper and lower units are
in series aCross the powel supply, and the load is
connected at their junction when the signal at thE)
collector of Q4 goes negative Q6 and Q8 conduct,
since they are all PNP types When the signal goes
positive Q5 and Q7 conduct since Q5 is a NPN type
Thus, the full signal appears at the junction point
Note that Q4 is the only stage in the power ampli-
lim with this voltage gain A high frequency trans-
istor is used at this point to improve stability.
Several feedback loops are employed
in
this Cil-
cuit, including RIO, C7, CIO, and C9, C7 and C10
provide high frequency stability, CI2 supplies posi-
tive feedback from the output to the collector Cil-
cuit of Q4 to increase the signal handling capability
of this stage
MAINTENANCE
PREVENTIVE MAINTENANCE
The M-6035 Cue-Intercom Amplifier is designed for
long, trouble-free service However, as with all high
quality electronic equipment, a regular program of
inspection should be followed.
It is recommended that when the amplifier is fir st
received, parI of the console, D.C voltage be
measured with the same voltmeter that "ill be used
for maintenance and troubleshooting, and these
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