Harris GATES M-6035 User manual

1USTRUCTION

EGUK

INSTRUCTION

BOOK

FOR

M-6035

CUE-

INTERCOM

AMPLIFIER

88 -

108

MC

r1=-71

tib

Q d

eizià

;

ES

Juno

1965

GATES

RADIO

COMPANY •

QUINCY,

ILLINOIS

e

62301

o

U.S.A.

A

Division

of

Harris-Intertype

Corporation

•

INSTALLATION

AND OPERATING

1.1STRUCTION

FOR

M-6035

CUE-

INTERCOM

AMPLIFIER

•

GAIN:

FREQUENCY

RESPONSE:

HARMONIC

DISTORTION:

NOISE:

SOURCE

IMPEDANCE:

OUTPUT

LOAD

IMPEDANCE:

MAXIMUM

INPUT

LEVEL:

MAXIMUM

OUTPUT

LEVEL:

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.

MAXIMUM

OPERA-

TING

AMBIENT

•

TEMPERATURE:

55°

C. (

131°

F.)

MAXIMUM

STORAGE

AMBIENT

TEMPERATURE:

85°

C. (

185°

F.)

POWER

REQUIRE-

MENTS: -

37

V.

DC (

unregulated)

10 -

75

ma.

•

TRANSISTORS:

1

-

2N214

2

-

2N1183

3

-

2N1414

1

-

2N5088

1

-

2N5087

SIZE:

3-1/4"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

transistor

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

mounting

frame,

which

carries

a

mating

re-

ceptacle

for

the

printed

card type

connection.

The

connections

on

the

printed

wiring

board

are

gold

flashed

for

positive

connection

with

the

gold

con-

di

tacts

on

the

mating

receptacle.

WThe

amplifier

requires

a -

37

V.

DC

unregulated

power

source

and

requires

from 10

iña. (

at

average

power

output)

to

a

maximum

of

75

ma. (

at +

28

DBM

output).

THEORY

OF

OPERATION

For

the

purpose

of

explanation,

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

resistor.

This

resistor

prevents

excessive

signals

from

being

developed

by

the

speaker

at

its

resonance

frequency,

which

would

over-

drive

the

input

stage.

Both

stages

are

of

the

common

emitter

configuration,

with

direct

coupling

utilized

between

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

R1,

R2

and

R5.

This

method

of

biasing

also

insures

a

high

degree

of

temperature

stability.

Signal

degenera-

tion

is

also

for

Q2

by

R7.

The

volume

control, (

located

on

the

console)

situa-

ted

between

the

preamplifier

and

power

amplifier,

is

connected

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

amplifier

operate

Class

B,

and

are

arranged

in

the

circuit

configura-

tion

known

as "

single

ended

push-pull",

or "

follow-

ed

emitter

follower".

The

upper

and

lower

units

are

in

series

across

the

power

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-

fier

with

this

voltage

gain.

A

high

frequency

trans-

istor

is

used

at

this

point

to

improve

stability.

Several

feedback

loops

are

employed

in

this

cir-

cuit,

including

R10,

C7,

C10,

and

C9,

C7

and

C10

provide

high

frequency

stability,

C12

supplies

posi-

tive

feedback

from

the

output

to

the

collector

cir-

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

first

received,

part

of

the

console,

D.C.

voltage

be

measured

with

the

same

voltmeter

that

will

be

used

for

maintenance

and

troubleshooting,

and

these

I

•

0

2

readings

be

recorded

on

the

amplifier

schematic

a-

bove

the

typical

voltages

shown.

SERVICING

When

servicing

the

amplifier,

the

following

points

should

be

observed.

1.

The

condition

of

the

output

stage

measuring

the

speaker bus

voltage

at

the

junction

of

R21

and

the

collector

6f

Q8.

2.

Circuit

resistances

should

be

measured

only

af-

ter

removing

the

associated

transistor or

trans-

istors,

to

prevent

damage

due

to

ohmmeter

bat-

tery

voltage.

3.

DO NOT

remove

or

insert

transistors

with

the

power

ON.

4.

DO

NOT

probe

the

printed

board

with

a

metal

probe

with

the

power

ON.

5.

Circuit

voltages

are

reversed

from standard

va-

cuum

tube

practice,

as

is

the

polarity

of

all

electrolytic

capacitors.

6.

The

location

of

the

positive

end

of

each

elec-

trolytic

capacitor

is

indicated

by

the

white dot

marked

on

the top

of

the

circuit

board.

PARTS

LIST

Symbol

No.

Gates

Stock

No.

Description

Cl,

C2, C3,

C4,

C9

522

0242

000

Cap.,

25

mfd,

25

V.

C5

506 0005 000

Cap., .

1

mfd.,

200

V.

C6

522 0178

000

Cap.,

25

mfd.,

6

V.

6 —

—37 ','

DC —

1T111NPUT

—

(T1)1NPUT—

VOL.

CONT.

AR

NI

—

VOL

.

CONY •

TOP —

11+60NO.

RETUI:N —

OUTPUT —

•

—T

1

sccor4r.trr

GREEN

Ti 5E

CONDARY

ILACK

Symbol

No.

C7,

C8

C12

C13

C14

Q1

Q6

Q2,

Q3, Q4,

Q5

Q7,

Q8

Gates

Stock

No.

Description

516

0054

000

Cap., .

001

mfd.,

1KV,

10%

522

0256

000

Cap.,

20

mfd.,

50

V.

522

0246

000

Cap.,

100

mfd.,

25

V.

506

0006

000

Cap., .

25

mfd.,

200

V.

506

0004

000

Cap., .

05

mfd.,

200

V.

380

0115

000

Transistor,

2N5088

380

0011

000

Transistor,

2N214

380

0112

000

Transistor,

2N5087

380

0014

000

Transistor,

2N1414

380

0012

000

Transistor,

2N1183

121

R2,

R3

R4

R5

R6

R7,

R8

R9,

R19,

R20

R10,

R14

RII

R12,

R18

R13

R15

R16

R23

R2,4

R21,

R22

R25

R17

Tl

XD1,

XD2

XQ1,

XQ2,

XQ3, XQ4,

XQ5,

XQ6

XQ7,

XQ8

540

0081

000

540

0071

000

540

0076

000

540

0075

000

540

0057

000

540

0036

000

540

0045

000

540

0041

000

540

0073

000

540

0085

000

540

0039

000

540

0098

000

540

0049

000

540

0070

000

540

0017

000

540

0023

000

540

0005

000

540

0845

000

540

0025

000

478

02851)00

Res.,

22K

ohm,

1/2

W.,

5%

Res.,

8200

ohm,

1/2

W.,

5%

Res.,

13K

ohm,

1/2

W.,

5%

Res.,

12K

ohm,

1/2

W.,

5%

Res.,

2200

ohm,

1/2W.,

5%

Res.,

300

ohm,

1/2W..

5%

Res.,

680

ohm, 1/2

W.,

5%

Res.,

470

ohm,

1/2

W.,

5%

Res.,

10K

ohm,

1/2

W.,

10%

Res.,

33K

ohm,

1/2

W.,

5%

Res.,

390

ohm,

112W.,

5%

Res.,

110K

ohm,

1/2

W.,

5%

Res.,

1K

ohm,

1/2

W.,

5%

Res.,

7500

olun,

1/2W.,

5%

Res.,

47

ohm,

1/2

W.,

5%

Res.,

82

ohm,

1/2

W.,

5%

Res.,

15

ohm,

1/2W.,

5%

Res.,

6.8

ohm,

1/2

W.,

5%

Res.,

100

ohm,

1/2W.,

5%

Transformer,

Input

404

0227

000

Dissipator

404

0066

000

Socket

404

0149

000

Socket

Ti

01

'

lo

03

05

4.

C12

06

122

07

C13

I

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DI.Vr

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1

INSTALLATION

AND

OPERATING

INSTRUCTIONS

FOR

M-6034

TRANSISTOR

PREAMPLIFIER

TECHNICAL

DATA

GAIN:

45

DB ±

1

DB

operated

into

a

600

ohm

load.

FREQUENCY

RESPONSE: ±

1

DB,

30

cps

to

15,000

cps.

HARMONIC

DISTORTION:

Under 0.5%

from

50

cps

to

15

KC

at +

5

DBM

output.

Under

0.5%

from

30

cps

to

15

KC

at.--

50

DBM

output.

INTERNIODULATION

DISTORTION:

Under

0.5%

at —

5

DBM

output

level,

and

under

1.0%

at +

5

DBM

output

level.

Distortion

measured

at

equiva-

lent

sine

wave

output

using

40

cps

and

7

KC

mixed

4

to

1.

NOISE

LEVEL: —

122

DBM

equivalent

input

noise.

SOURCE

IMPEDANCE:

30/50

and

150/250

ohms.

INPUT

IMPEDANCE:

Input

transformer

unloaded,

re-

sulting

in

input

impedance

being

substantially

higher

than

source

impedance.

OUTPUT

LOAD

IMPEDANCE:

MAXIMUM

INPUT

LEVEL:

MAXIMUM

OUTPUT

LEVEL:

600

ohms ±

10%.

—40

DBM.

+5

DBM.

MAXIMUM

OPERATING

AMBIENT

TEMPERATURE:

55°

C. (

131°

F.)

MAXIMUM

STORAGE

AMBIENT

TEMPERATURE:

POWER

REQUIRE-

MENTS:

TRANSISTORS:

MOUNTING:

85°

C. (

185°

F.)

—30

V.

DC

at

15

ma

with

less

than .

1

MV

ripple.

3 -

2N5087

1 -

40319

Requires

M-6039

mounting

frame.

SIZE:

3-1/4"

Wide

x

6-3/8"

Long

x

1"

Thick.

DESCRIPTION

The

Gates

M-6034

Transistor

Preamplifier

is

a

premium

quality

low

noise

unit

for

use

in

consoles,

and

is

com-

pletely

temperature

conipensated

using

the

latest

tech-

niques.

The

amplifier

has

a

gain

of

45

DB

with

a

maxi-

mum

output

is

unbaraneed

and

transformerless,

which

is

designed

to

operate

into

a

600

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

amplifier

is

designed

to

provide

a

fixed

gain of

45

DB.

It

is

a

four-

stage

amplifier

and

utilizes

a

trans-

formerless

output.

It

features

negative

feedback

to

re-

duce

distortion

to

a

very

low

level

and

minimizes

specification

changes

with

transistor

changes.

Signal

is

applied

to

pins

C

and

E

and

is

fed

through

transformer,

Ti,

to

the

base

of

Q1 (

2N1307).

Q1

is

a

low

noise

transistor

operated

at

ideal

collector

current

for

minimum

noise.

It

will

be

noted

that

the

first

stage

is

series

fed

through

Ti

to

provide

the

maximum

input

gain

from

Ti.

Cl

and

R1

are

connected

across

the

secon-

dary of

Ti

to

stabilize

the

amplifier.

The

value

of

R1

and

Cl

were

picked

to

provide

a

roll

off

above

the

audio

range

to

prevent

amplification

of

very high

frequency

noise.

The

signal

is

then

direct

coupled

from

the

collector

of

Q1

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 (

thru

C8)

to

Q3.

The

collector

of

Q3

is

direct

coupled

to

the

base

of

Q4.

Q4

is

an

emitter

follower.

Emitter

followers

are

very

stable

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

first

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

determine

the

bias

points

of

the

transistors

and

any

departure

of

20%

or

more

should be

considered

a

defect.

NOTE:

Use

of the

resis-

tance

chart

will

help

detect

faulty

components.

Step

2 -

Before

any

signal

measurements

are

made,

re-

place

any

defective

parts

to

make

DC

voltages

correct.

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

are

for —

40

DBM

input

150

ohms

not

terminated.

DO

NOT

remove

or

insert

transistors

with

the

power

ON.

Gates Radio

Company

Quincy,

Illinois

•

Harris GATES M-6035 User manual

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