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INSTALLATION AND OPERATING INSTRUCTIONS
FOR M-6034 TRANSISTOR PREAMPLIFIER
GAIN:
FREQUENCY
RESPONSE:
HAmlONIC
DISTORTION:
INTEml0DULATION
DISTORTION:
NOISE LEVEL:
TECHNICAL DATA
45 DB ±l DB operated into a
600 ohm load
±1 DB, 30 cps
to 15,000 cps
Under 0.5% from 50 cps
to 15
KC at +5 Dml output
Under 0.5% flOm 30 cps
to 15
KC at ·-50 DBM output
Under 0.5% at -5 DBM output
level, and under 10% at +5
DBM output level,
Distortion measmed at equiva-
lent sine wave output using 40
cps and 7 KC mixed 4
to 1
·_·122 DBM equivalent input
nOIse
SOURCE IMPEDANCE: 30/50 and
150/250 ohms
INPUT IMPEDANCE:
OUTPUT LOAD
IMPEDANCE:
MAXIMUM II\Pl'T
LEVEL:
,1AXIMUM OUTPUT
Input transformer unloaded, re-
sulting in input impedance
being substantially higher than
SQlIlee
impedance
GOO ohms ±IO%
·-40 DBM
LEVEL:
+5 DBM
MAXIMUM OPERATING
AMBIENT
TEMPERATURE:
55'
C.
(]3I' F )
~jAXIMUM
STORAGE
A,lBIE'iT
TE~lPERATURE:
85'
C
(185' F )
POWER REQUIRE-
MENTS:
-30 V DC at 15 ma with less
than 1 MV ripple
TRANSISTORS:
3 - 2N5087
1 - 40319
MOUNTING:
Requires M-6039 mounting
frame
SIZE:
3·1/ 4" Wide x 6-3/8" Long
x ])' Thick
DESCRIPTION
The Gates
~j-6034
Transistor Preamplifier is a premium
qualit~1
low noise unit for use in consoles. and is com-
pletely temperature comPensated using th~ latest tech-
niques The amplifiel has a gain of 45 DB \vith a maxi-
mUm output is unbalanced and hansformerless, which
is designed to operate into a GOO ohm variable attenua-
tor
The input is balanced, and is connected for
150/250
ohm source impedance at the factory but may be recon-
nected for 30/50 ohms
THEORY OF OPERATION
This amplifici is designed to prodde a fixed gain of
45 DB. It is a four-stage amplifier and utilizes a trans-
formerless outpuL It features negative feedback
to re-
duce distortion to a very low level and minimizes
specification changes with tIansistOi changes
Signal is applied to pins C and E and is fed through
transformer,
'II,
to the base of Ql (2NI307) Ql is a
low noise transistor operated at ideal collector current
for minimum noise It will be noted that the first stage
1
is series fed -through Tl to provide the maximum input
gain from 1'1 Cl and Rl are connected across the secon-
dary of Tl to stabilize the amplifier The value of Rl
and Cl were picked to provide a roll off above the audio
ra~ge
to prevent amplification of very high
frequency
nOIse
The signal is then direct coupled from the collector of
Ql to the base of Q2 Q2 is a very high gain stage be-
cause the emitter is completely by-passed. The signal
IS
then coupled from the collector of Q2 (thm CS)'to
Q3. The collector of Q3 is direct coupled
to the base
of Q4 Q4 is an emitter follower Emitter followers
are Velj' stablC' and are virtually distortionless, This
also provides the low output impedance required to
feed a 600 ohm fader Feedback is applied from R17
through R13 and C9, R7 and C5 to the emitter resistor
<R6) of the fj"t stage R13 and C9 provide a boost of
1 DB at 30 cps to make the response flat in the audio
range
MAINTENANCE
Transistor amplifiers are designed for a long trouble-
free life, however, dust and dirt can cause trouble,
A
monthly dusting with a soft brush should be adequate
SHOULD TROUBLE OCCUR -
Step 1 - First check all DC voltages The DC voltages
detelmine the bias points of the transistors
and any depmture of 20% or more should be
considered a defect NOTE: Use of the resis-
tance chart wi
11
help detect faulty components
Step 2 - Before any signal meaSUIements are made, re-
place any defective parts to make DC voltages
conect
Step 3 - After all DC voltages are correct, signal tests
may be performed The correct (RMS) voltages
are shown on the schematic diagram Voltages
shown
at
e for -40 DBM input
@
150 ohms not
terminated
DO NOT remove or inseIt transistors with the power
ON
Gate s Radio Company
Quincy Illinois
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