Gates M5700 Series Manuale utente

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M5700

TRANSISTOR

PROGRAM

AMPLIFIER

INSTIUCTION

MANUAL

Ill

OHS

001

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----

--

Fig. 1 - M57

00

Transistor

Program

Am

plifi

er

The

Gates

Transistor

Prog

r

am

Amplifier

is

panel.

availab

le

in

th

r

ee

versions

:

1.

The

MS

7

00

is

designed

specifically

for

use

in

Ga

tes

Tr

ans

i

stor

Consoles

.

It

is

supp

li

ed

less

the

interstage

level

cont

r

ol,

and

with

the

input

unterminated

.

The

con

-

trol

is

mounted

externally

on

the

Console

2.

The

MS700A

is

des

i

gned

for

r

ack

mount

-

ing

in

system

ap

plications

,

and

h

as

the

leve

l

cont

r

ol

mounted

internally

and

the

input

te

r-

min

a

ted

.

3 .

The

M5700B

is

identical

to

the

M5700A

except

that

the

input

is

unterminated

.

TECHNICAL

DATA

Gain

:

M5700

:

80

DB,

M5700B

:

70DB,

may

be

reduced

as

required

wi

t~

internal

volume

control.

Frequency

Response

:

~l

db

from

30

to

15,000

cps

.

Harmonic

Distortion:

Under

O.

75

%

at

30

cps

. , o . 5% from

50

to

15,000

cps

. ,

at

+24

dbm

output

.

Intermodulation

Distortion

:

Under

0 . 3%

at

+

14

dbm

equivalent

sine

wave

power

output

,

using

40

and

7

000

cps

. ,

mixed

4:1 .

Under

1. 5%

at

+24

dbm.

Noise

Level

:

-

115

dbm

equivalent

input

noise

.

Source

Impedance

:

150

/250

ohms,

or

500

/

600

ohms

.

Input

Impedance

:

Factory

connected

for

150

ohms

.

also

be

connected

for

600

ohms

.

May

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Load

Impedance

:

Factory

connected

for

600

ohms

.

May

A

also

be

connected

for

150

ohms.

·•

aximum

Input

Level:

-35

dbm.

Maximum

Output

Level:

+24

dbm.

Maximum

Operating

Ambient

Temperature:

55o

C.

(131°

F. )

Maximum

Storage

Ambient

Temperature

:

85°

C.

(185°

F. )

Power

Requirements

:

30

volts

D. C . , 90

ma

. , 0

.1

mv.

maximum

ripple.

Trans

is

tors:

5 -

2N1414

1 -

2N1183

1 -

2N422

Finish

:

Cadmium

plated

cover,

black

escutcheon

plate

.

Mounting:

1

M6031

Mounting

Tray

r

equi

r

ed

to

mount

in

M6029

Shelf

Assembly

.

Shelf

assem

-

bly

accommodates

seven

Program

Ampli-

fiers

and

requires

panel

space

of

3-1/2"

X 19" .

Size:

2-

7/32"

wide,

3-1/8"

high,

10

-

3/4"

long,

overall.

Weight:

4-1/4

lbs.

net.

8-

1

/4

lbs

.

packed.

Cubage

:

o.

8

cu

.

ft

.

domestic

pack

.

DESCRIPTION

The

MS

700

Program

Amplifier

is

completely

transistorized,

and

is

designed

for

use

as

a

line

or

isolation

amplifier

in

broadcasting

and

recording

applications

.

Special

tech

-

AJ.

ques

have

been

employed

to

obtain

low

~

oise,

low

distortion,

and

good

temperatu

re

stability

.

The

amplifier

is

used

with

the

M6031

Mount

-

ing

Tray

which

carries

a

mating

receptacle

and

is

supplied

with

mounting

hardware.

Up

to

seven

trays

may

be

installed

on

the

M6029

Shelf

Assembly,

which

mounts

in

a

standard

Gates

rack

cabinet,

and

occupies

3-1/2"

of

panel

space.

A

keying

is

pro

-

"-

vided

with

the

mounting

tray

to

prevent

ac-

cidental

interchange

of

non-similar

plug-in

units

in

the

system.

On

the

front

panel

of

the

A

and

B

models

is

located

the

interstage

l

evel

control

.

The

output

transformer

and

receptacle

are

at-

tached

to

the

frame

,

and

all

other

compo-

nents

are

mounted

on

the

printed

wiring

boards

.

Typica

l

frequency

response

and

di

stortion

curves

are

shown

in

Fig

. 2 .

These

meas-

urements

were

taken

with

all

transistors

se-

lected

at

random.

~1.0

0.8

0.6

0.4

0.2

0

TYPICAL

TOTAL HARMONIC

DISTORTION

AT +

24

DBM

OUTPUT

DB 0

-I

-2

e=

!

-5

,

/

I/

10

20

1 1 11

11

I I I

111111

I I

TYPICAL

FREQUENCY

RESPONSE,

150A

IN,

600A

OUT

50

100

200

500

21<C

Fig.

2 -

Response

and

Distortion.

51<C

"

\.

\ '

IOl<C

201<

C

1501<C

813

5380

001

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2

INSTALLATION

MOUNTING

TRAY

AND SHELF ASSEMBLY

Mounting

holes

have

been

spaced

in

the

shelf

assembly

to

allow

it

to

be

completely

filled

with

trays

of

any

one

type

for

the

Gates

transistorized

units.

It

is

possible,

where

maximum

use

of

shelf

space

is

not

required,

to

mix

trays

of

different

sizes.

Thus

a

pro-

gram

amplifier

and

preamplifier

could

be

placed

at

the

left

and

a

power

supply

at

the

extreme

right.

Proceed

as

follows:

1.

Locate

the

first

tray

at

the

extreme

lef

t

or

right

of

the

shelf

assembly,

with

the

re-

ceptacle

at

the

rear.

The

countersunk

holes

of

the

tray

will

fit

into

the

matching

holes

in

the

shelf,

when

properly

located

.

Leave

a

1/16"

space

between

trays.

2.

Secure

the

tray

to

the

shelf

with

the

two

-#4-40 x

1/4"

flat

head

screws

with

the

two

-#6

internal

-

external

shakeproof

washers

un-

der

two

-#4

hex

nuts

.

813

6350

001

Fig . 3 -

Shelf

Assembly

With

Guide

Bar

3.

Determine

whether

or

not

the

guide

bar,

shown

in

Fig

.

3,

will

be

required.

The

pur-

pose

of

this

bar

is

to

prevent

possible

dam

-

age

to

the

mating

connectors

when

upward

pressure

is

inadvertently

applied

to

the

am-

plifier

during

withdrawal.

The

bar

will

be

required

only

where

no

other

protecting

ob-

struction

is

present

in

the

rack,

or

where

the

shelf

is

used

at

a

location

such

as

a

work

bench

.

It

will

not

be

required

where

another

M6029

Shelf

Assembly

is

mounted

directly

above,

or

where

overhead

equipment

interferes

wit

-

mounting

of

the

shelf

due

to

the

presence

of

the

bar.

The

mounting

screws

are

locat-

ed

so

that

they

may

be

removed

from

within

the

shelf.

4 .

Mount

the

shelf

in

the

rack

using

hard-

ware

supplied

with

the

rack

.

The

two

end

strips

mount

under

the

screw

heads,

and

are

to

be

flush

with

the

drop

panel.

INPUT AND OUTPUT TRANSFORMERS

The

input

transformer

is

factory

connected

for

150

ohms

primary

impedance,

as

shown

on

the

schematic

diagram

and

on

Fig . 4 .

Refer

to

fig

. 4

for

connections

for

600

ohms

impedance.

Note

that

the

input

terminating

resistor,

R3

l,

must

be

changed

to

620

ohms

when

making

this

change

.

IIOA

113

1371

001

Fig.

4 -

Input

Transformer

Connections

,.

Where

it

is

desired

to

use

the

M5700A

Pro-

gram

Amplifier

with

an

unterminated

input

remove

R31,

which

is

a

150

ohm

resistor

connected

directly

between

the

input

lugs

on

the

preamplifier

printed

board

.

Also

change

Rl from

620

ohms

to

240

ohms

.

Location

of

these

resistors

may

be

determined

from

the

component

location

drawing,

Fig.

6 .

Both

the

M5700

and

M5700B

models

hav

._

these

changes

incorporated.

W

The

output

transformer

is

factory

connected

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for

600

ohms

secondary

impedance.

To

re-

'9:>nnect

for

150

ohms

refer

to

the

schematic

diagram.

Remove

the

green/white

and

black

wires

from

terminal

#7

.

Connect

the

black

wire

to

terminal

#5

and

the

green/white

wire

to

terminal

#6.

EXTERNAL

CONNECTIONS

External

connections

are

made

to

the

mount-

ing

tray

receptacle

as

follows:

Circuit

External

Control

(Optional)

+30

V.

Circuit

Ground

Output

Connections

Output

Center-Tap

(600

ohms)

Input

Connections

Input

Center-Rap

-30

V .

Chasis

Ground

- o

Connection

Terminals

1,

2,

3

4

5,6

7

9

I

10

11

12

13

8,14,15,16

Jumper

together

all

#13

terminals

on

the

shelf,

whether

program

amplifiers

or

other

types,

and

connect

to

the

rack

ground

bus.

Connection

from

rack

ground

to

the

circuit

ground

in

the

program

amplifier

(B+)

should

be

made

at

the

amplifier

(not

at

the

power

supply)

.

Make

a

connection

from

the

rack

ground

bus

to

each

amplifier

terminal

#14,

SEPARATELY,

with

at

least

18guagewire.

These

circuit

grounds

must

be

carried

sepa-

rately

to

prevent

the

possibility

of

interac-

3

tion

(due

to

m1xrng

of

return

currents

in

a

common

wire)

.

Where

other

types

of

amp-

lifiers

are

mounted

on

the

same

shelf,

con

-

sult

their

respective

Instruction

Book

for

grounding

information.

Where

many

ampli-

fiers

and

power

supplies

are

mounted

in

a

rack,

it

is

preferable

to

run

a

vertical

rack

ground

bus

-bar,

to

pick

up

grounds

at

each

shelf.

Run

the

D.

C .

supply

leads,

output

pair,

and

chassis

and

circuit

ground

leads

along

the

rear

edge

of

the

shelf

.

The

D .

C.

supply

leads

should

be

at

least

18

gauge,

and

must

be

run

SEPARATELY

from

each

program

amp

-

lifier

to

its

respective

power

supply,

to

pre-

vent

the

possibility

of

common

coupling

in

the

power

wiring

.

See

the

power

supply

In-

struction

Book

for

further

information

.

Run

input

pairs

and

external

control

leads

along

the

shelf

brace,

above

the

receptacles

.

EXTERNAL

VOLUME CONTROL

Reference

to

the

schematic

diagram

will

in

-

dicate

that

the

program

amplifier

is

wired

to

accommodate

an

external

volume

control.

This

feature

makes

it

possible

to

locate

the

volume

control

on

an

adjacent

rack

panel,

or

on

a

console

control

panel,

when

the

amp-

lifier

is

mounted

internall

y .

The

in

terna

l

control,

R30,

must

be

disconnected

when

the

amplifier

is

to

be

used

.in

this

way

.

The

(R30)

control

may

be

ordered

as

part

number

550

0218

000

.

THEORY

OF

OPERATION

For

the

purpose

of

explanation,

the

program

amplifier

can

be

considered

to

be

made

up

of

two

parts

:

the

preamplifier,

and

the

high

level

amplifier

.

THE PREAMPLIFIER

e

he

four

stage

preamplifier

has

a

transform-

er

coupled

input

and

emitter

follower

out-

put,

with

direct

coupling

utilized

between

Ql

and

02

,

and

between

Q3

and

04

.

The

first

staget

ransistor

is

a

low

noisetype

de-

signed

for

use

in

critical

low

noise

appli-

cations.

Biasing

is

accomplished

by

a

combination

of

voltage

divider

and

emitter

resistance,

as

with

R2,

R3

,

and

RS

.

This

method

of

bias-

ing

also

insures

a

high

degree

of

tempera-

ture

stability.

Signal

degeneration

is

pro-

vided

for

Ql

by

R6,

and

for

Q3

by

Rl

7.

A

loop

feedback

network

connects

from Q3 ,

thru

R7

and

CS,

to

Ql.

The

large

amount

of

feedback

and

degeneration

obtained

by

these

www.SteamPoweredRadio.Com

4

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6

methods

reduces

distortion

in

the

preamp

-

lifier

to

an

extremely

low

value,

and

makes

the

operation

almost

completely

independent

of

variations

in

transistor

parameters.

THE

HIGH

LE.VEL

AMPLIFIER

The

output

stage,

0

7,

is

connected

in

the

common

emitter

configuration,

with

a

ser-

ies

fed

output

transformer,

T2,

in

the

col-

lector

circuit.

Emitter

resistor

R29

provid-

es

a

large

amount

of

degeneration,

to

reduce

PREA

MP

..

-t--t!!illll

OUT

Tl

PRI. I

0

large-signal

distortion

to

a

low

value

.

The

low

driving

impedance

required

by

a

stage

of

this

type

is

obtained

from

the

e-

mitter

follower,

06.

The

stages

are

direct

coupled,

with

R25

and

R26

establishing

the

bias

on

both

Q6

and

07

.

QS

provides

addi-

tional

gain

for

the

high

level

amplifier.

The

feedback

network

,

R2

8

and

C

16

,

is

used

primarily

for

low

frequency

response

compensation.

0

CONTROL

Pl-I

AMP

.

IN

CONTROL

ARM

.

PI-Z

CONTROL

CO

M.

Pl

- 3

B+(Pl-4)

B-(Pl-12)

TZ

PRI.

RED

T2

PRI. BLUE

Fig.

6 -

Printed

Board

Component

Location,

Viewed

from

Wiring

Side.

www.SteamPoweredRadio.Com

7

MA

INTENANCE

-PRLVENTNE MAINTENANCE

The

MS

700

Program

Amp

li

fier

is

designed

for

long,

troub

le-

free

service

.

However,

as

with

all

high

quality

elect

r

onic

equip

-

ment,

a

regular

program

of

inspection

should

be

followed

.

It

is

recommended

that

when

the

amplifier

is

first

placed

in

operation

, D.

C.

voltage

be

measured

with

the

same

voltmeter

that

will

be

used

for

maintenance

and

trouble

shooting,

and

that

these

readings

be

record

-

ed

on

the

amplifier

schematic

above

the

typical

voltage

shown

.

Dust

and

dirt

should

be

periodically

remov-

ed

with

a

soft

brush.

SERVICING

When

servicing

the

amplifier,

the

following

points

should

be

observed:

1.

The

condition

of

the

output

stages,

07

and

Q6

,

can

be

most

r

eadily

checked

by

measuring

the

D. C .

voltages

associated

wit

h

these

stages

.

2.

Circu

it r

esistances

should

be

measu

r

ed

only

after

r

emoving

the

associated

tr

ansis-

to

r

or

trans

i

stors

,

to

prevent

damage

due

to

ohm-meter

battery

voltage.

3 .

Do

not

remove

or

insert

transistors

wi

th

the

power

on.

4 .

Do

no

t

probe

the

pr

inted

board

with

a

metal

pr

obe

with

the

power

on

.

5 .

Circuit

vo

l

tages

are

reversed

from

stand

-

ard

vacuum

tube

practice,

as

is

the

po

l

arity

of

all

the

elect

r

olytic

capacitors

.

6 .

The

location

of

the

positive

end

of

each

electrolytic

capacito

r

is

indicated

by

the

white

dot

marked

on

the

top

of

the

circuit

boa

rd .

PRINTED CHASSIS

COMPONENT

REPLACEMENT

CHECKING

COMPONENTS

1.

The

components

should

be

carefully

checked

by

measuring

circuit

voltages

and

resistances

before

attempting

to

remove

one

of

the

leads

from

the

printed

chassis.

Ex-

treme

care

must

be

exercised

in

removing

the

lead

to

prevent

damage

to

the

board

or

conductors.

This

operation

should

not

be

considered

unless

it

is

the

only

way

the

component

can

be

checked

.

If

one

lead

must

be

removed

without

damage

to

the

compo-

nent,

apply

a

well

cleaned

and

tinned

25

to

60

watt

iron

to

the

fillet

adjacent

to

the

lead.

With

small

long

nose

pliers

or

thin

screwdriver,

pry

the

folded

portion

of

the

lead

in

line

with

the

holes

.

Applying

the

iron

for

more

than

four

seconds

at

a

time

may

damage

the

chassis

base

material

.

Remove

as

much

solder

from

the

lead

as

possible.

Remove

all

the

kinks

in

the

wire

.

With

heat

applied

,

gently

pull

the

wire

through

the

hole

.

RESOLDERING THE

COMPONENT

2 .

If

the

component

is

good

,

replace

as

follows

:

Use

a

metal

twist

drill

(1/8"

dia

.

or

less)

to

cl

ear

the

hole

only

in

the

fi

ll

et

of

solde

r .

Turn

with

the

fingers

only

re

-

move

solder

slowly

to

prevent

the

drill

from

tearing

the

fillet

.

(r

A~

botto

m

vi

ew

of

ch

ass

is

I I

Fig.

7 -

Cleaning

Holes

www.SteamPoweredRadio.Com

8

Be

sure

the

component

lead

is

straight

and

free

of

solder.

Push

it

gently

back

through

the

hole

until

some

of

it

shows

on

the

other

side

.

Solder

carefully

but

rapidly

to

pre-

vent

chassis

damage.

REPLACING

COMPONENTS

3.

Components

can

be

replaced

with

less

chance

of

damage

to

the

chassis

than

the

removal

and

rewiring

of

one

of

the

leads.

Remove

as

follows:

Clip

the

leads

close

to

the

body

of

the

component.

Heat

the

fillet

and

gently

push

the

wire

through

until

t

he

hook

may

be

clipped

off.

Clip

the

hook

off

(on

the

soldered

side)

with

sharp

cutters

.

;~~

~

4/P

pliers

A B

~

---~

'---.

..

c)

Si

~

£..--r:=r-n~

tip

Fig.

9 -

Removing

Components

With

the

iron

applied

to

the

fillet,

pull

the

wire

gently

out

of

the

component

side

of

the

chassis

~

Fig 8

~

pliers

[_

_

..

-

~

iron

tip

Fig.

8 -

Removing

Lead

After

removing

the

leads,

prepare

the

chas-

sis

for

the

new

component

as

explained

in

Fig.

7,

paragraph

2.

To

replace

the

component,

fold

the

leads

on

the

new

part

to

the

same

spacing

as

the

mounting

holes

.

Insert

the

part

and

fold

the

leads

under

the

chassis

to

hold

the

compo-

nent

finnly

against

it.

Fig.

10

-

Installing

New

Component

Clip

off

the

excess

wire.

Place

the

iron

on

both

the

component

lead

and

fill

et

.

Solder

carefully

and

rapidly

to

prevent

damage

to

the

chassis

base.

If

one

of

the

conductors

is

damaged,

it

is

seldom

necessary

to

scrap

the

printed

chassis.

Lay

a

small

piece

of

wire

(#18

to

24

ga

. )

across

the

break

and

solder

each

end

to

the

conductor

.

If

a

fillet

is

pulled

loose,

break

it

off

to

get

rid

of

the

loose

end.

Fold

the

new

compo-

nent

lead

to

lay

on

the

conductor

and

solder

.

If

the

component

lead

is

too

short,

solder

in

another

piece

of

wire

to

bridge

the

gap e

Printed

chassis

construction

places

no

strain

on

repairs

of

this

nature,

thus,

soldering

alone

will

provide

sufficient

mechanical

strength

even

with

heavy

shock

and

v

ibra-

tic:1

in

almost

every

case.

The

base

material

used

on

the

printed

chas-

sis

is

the

best

available

for

this

service

.

The

two

oz.

copper

is

twice

as

heavy

as

us-

ed

in

average

applications

of

this

type

of

equipment

.

This

assures

reliable

service

and

repair,

if

and

when

required.

If

re-

placement

parts

are

ordered

from

the

Gates

Radio

Company,

please

list

the

Gates

stock

number

given

in

the

parts

list,

as

·

well

as

the

description

of

the

part.

This

will

as-

sure

receipt

of

the

right

part

immediately.

PARTS

LIST

Symbol

No.

Cl

(M5700)

Cl

(M5700B)

C2

,

Cll

C3

Gates

Stock

No.

508

0076

000

508

0215

000

522

0178

000

522

0160

000

Description

Cap

• , •005

uf

. , 100 V•

Cap

. ,

.01

uf

.,

100v

.

Cap

. ,

25

uf.

,

6V

. D.

C.

Cap.

,

100

uf.

,

3V

.

D.C

.

www.SteamPoweredRadio.Com

..

Symbol

No

.

Gates

Stock

No.

Description

-

C4

,

C7,

ca

Cl0

,

Cl3

522

0242

000

Cap.,

25

uf.,

25V.D.C.

cs

516

0054

000

C

ap.,

.001

uf.,

1

KV

CG

522

0187

000

Cap.,

2

00

uf.

, 6 V. D.C .

Cl4

522

0189

000

Cap

.,

300

uf.

, 6 V.

D.

C .

ClS

516

0075

000

Cap

. , .

005

uf.,

1

KV

Cl6

(MS700)

522

0248

000

Cap.

, 2

uf.

,

S0V

. D.C .

Cl6

(MS700B)

522

0251

000

Cap

.,

2

uf.

,

S0V.

D.C

.

Cl7

516

0035

000

Cap.,

250

uuf.,

1

KV

Pl

610

0244

000

Plug

01

380

0004

000

Transistor

,

2N422

02

,

Q3,

Q4

,

QS ,

06

380

0014

000

Transistor

,

2Nl414

Q7

380

0012

000

Tr

ansistor

,

2Nll83

Rl

540

0044

000

Res.

,

620

ohm

,

1/2

W.

, 5%

R2

, R

4,

548

0050

000

Res

.,

20K

ohm

,

1/2

W

.,

1%

R3

, R

l2,

R22

540

0062

000

Res

.,

3600

ohm

,

1/2

W

.,

5%

RS

540

0066

000

Res.

,

5100

ohm

,

1/2

W

.,

5%

R6

548

0049

000

Res

.,

100

ohm

,

l/2W

.,

1%

R7

540

0046

000

Res

.,

750

ohm

,

1/2

W

.,

5%

R8

540

0077

000

Res

.,

15K

ohm

,

1/2

w

.,

5%

-

R9

540

0068

000

Res

.,

6200

ohm

, 1

/2

W

.,

5%

RIO

540

0064

000

Res

.,

4300

ohm

,

1/2

W

.,

5%

Rll

540

0095

000

Res

. , 82K

ohm

,

1/2

w

.,

5%

Rl4

540

0086

000

Res

.,

36K

ohm

,

1/2

W

.,

5%

Rl 5

540

0048

000

Res

.,

910

ohm

,

1/2

W.

, 5%

Rl6

540

0063

000

Res.

,

3900

ohm

,

1/2

W

.,

5%

R

l7

540

0032

000

Res

.,

200

ohm

,

1/2

w

.,

5%

Rl8

540

0058

000

Res

.,

2400

ohm

, 1

/2

W

.,

5%

Rl9

540

0035

000

Res

.,

270

ohm

, 1

/2

W.

, 5%

R20

540

0089

000

Res.

, 47K

ohm

,

1/2

W.

, 5%

R21

540

0073

000

Res

.,

l0K

ohm

,

1/2

W.

, 5%

R23

540

0025

000

Res

.,

100

ohm

,

1/2

W

.,

5%

R24

540

0049

000

Res

.,

1000

ohm

,

1/2

w

.,

5%

R25

548

0135

000

Res

.,

.25K

ohm,

1/2

W. , 1%

R26

548

0095

000

Res

.,

4640

ohm

,

l/2W.

, 1%

R27 ,

R31

540

0053

000

Res.

,

1500

ohm

,

1/2

W

.,

5%

R28

(M5700)

540

0065

000

Res

o, 4 .

7K

ohm

,

1/2

W.

, 5%

R28 (M5700B)

540

0059

000

Res

.,

2.

7K

ohm

,

1/2

W. , 5%

R29

548

0093

000

Res

.,

61.

9

ohm

, 1 W. , 1%

R30 (M5700A,

B)

550

0218

000

Potentiometer

,

2500

ohm

Tl

478

0183

000

Transformer

,

Input

T2

478

0125

000

Transformer

,

Output

XQl ,

XQ2

,

XQ3

,

XQ4

,

XQ5,

XQ6

404

0066

000

Socket

XQ7

404

0

149

000

Socket

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