Stromberg-Carlson APH-1100 Manual

STROMBERG-CARLSON®

niodel

APH-1100

100

watt

audio

power

amplifier

SPECIFICATIONS

OUTPUT

POWER

-

100

watts

with

less

than

5%

harmonic

distortion

from

50-15,

000

cps,

80

watts

with

less

than

2%

harmonic

distortion

from

40-20,

000

cps.

FREQUENCY

RESPONSE

-

20-30,

000

cps

±

ldb,

high

pass

filter

"out"

10-70,

000

cps

±4db,

high

pass

filter

"out"

IM

DISTORTION

-

3.

5%

maximL1m

with

4:1

ratio

of

60

cps

and

7KC

INPUT

SENSITIVITY

-1.

volts

into

250, 000

ohms

un-

balanced;

. 5

volts

into

10,

000

ohms

balanced

line

HUM AND NOISE -SOdb

below

100

watts

REGULATION

INPUTS

-

Full

load

to

no

load

less

than

2db

-One

input;

amplifier

may

be

operated

with

a 250K

ohm

unbalanced

input

or,

when

an

input

transformer

is

used

with

a lOK

ohm

balanced

input

GIIIIIIIID

GENERAL

CJVNAMICS

OUTPUT

CONTROLS

-70V

and

25V

center

tapped

constant

voltage

line

and

115V

aulio

output

receptacle.

-

Input

level

control,

DC

balance

and

Bias

Adjustment

Controls

POWER

SOURCE -

105-125

volts

AC,

50-60

cps

POWER

CONSUMPTION-·

175

watts

TUBE

AND DIODE

COMPLEMENT

1 - 7199

2 -

6550

2-1Nl764

1 -

1Nl873

Voltage

amplifier

and

phase

splitter

Power

Outputs

Rectifiers

(full

wave)

Bias

Supply

Rectifier

ACCESSORIES

Standby

Relay

-

172000-015,

Model

No.

RS-1012

Input

Transformer

-

172000-065,

Model

No.

TB-1011

Hinge

Kit

-

SC-1102

Amplifier

Panel

-

SCP-1101

ELECTRONICS

ROCHESTER

146011-204

.....

=

Ol

e+-

~

.....

~

e+-

.....

0

=

GENERAL

DESCRIPTION

The

APH-1100

is

a

high

quality,

100

watt

amplifier

de-

signed

for

use

in

school

systems

and

in

commercial

rack

and

shelf

mounted

applications.

Rack

mounting

of

this

unit

may

be

facilitated

by

the

use

of

an

accessory

hinge

kit

(SC-1102)

containing

a

hinged

bracket

for

use

in

pro-

viding

the

amplifier

with

a

"swing

out

for

service"

feature.

An

amplifier

panel

with

pilot

light

opening

(SCP-1101)

is

also

available

for

rack

mounting.

A

standby

relay,

Model

No.

RS-1012

(Part

no.

172000-

015),

can

be

accomodated

by

the

relay

socket

provided

on

the

amplifier

chassis.

Twenty

four

volts

DC (24 VDC)

applied

to

terminals

Kl

and

K2

will

energize

the

relay

and

ground

the

cathodes

of

the

output

tubes,

placing

the

amplifier

in

its

"ready"

mode

of

operation.

The

APH-1100

has

a

high

impedance

(250K

ohm)

un-

balanced

input

with

provision

for

the

installation

of

an

input

matching

transformer,

Model

No.

TB-1011

(part

no.

172000-065).

This

accessory

will

provide

isolation

from

the

input

source

and

permit

balanced

operation

from

a

source

of

lOK

ohms

or

less.

SERVICE

INFORMATION

Power

Transformer

The

power

transformer

of

the

APH-1100

features

a

tapped

primary

winding

for

either

117V

or

125V

operation.

Connections

for

the

two

voltage

ranges

are

as

follows-

White

lead

common,

Black

and

White

lead

117V

tap,

Black

lead

125V

tap.

All

amplifiers

shipped

from

the

factory

will

be

connected

for

125

volt

operation.

Should

the

line

voltage

in

your

locality

be

consistently

below

125

volts

reconnect

to

the

117V

tap.

Input

Transformers

Inputs

with

an

impedance

of

lOK

ohms

may

be

impedance

matched

to

the

amplifier

by

the

addition

ofan

input

trans-

former

172000-065

which

plugs

into

the

socket

provided

on

the

amplifier

chassis.

NOTE:

Before

installing

this

transformer

remove

the

plug-in

jumper

between

pins

3

and

4

of

the

socket.

If

an

unbalanced

high

impedance

input

is

to

be

connected

to

the

amplifier

the

transformer

must

be

removed

and

the

jumper

reinserted.

As

many

as

four

(4)

APH-1100

amplifiers

may

be

oper-

ated

in

parallel

from

either

the

Stromberg-Carlson

SCP-

1003

or

SCP-1005

preamplifier.

Standby

Relays

A

Standby

Relay,

172000-015,

available

as

an

accessory,

may

be

used

as

an

output

tube

cut-off

to

place

the

ampli-

fier

in

its

"standby"

mode.

Before

installing

the

Standby

Relay

the

plug-in

jumper

between

pins

5

and

6

of

the

relay

socket

(on

amplifier)

must

be

removed.

If,

at

any

time,

the

Standby

Relay

is

removed

this

jumper

must

be

reinserted.

Once

the

relay

is

installed

twenty

four

(24)

volts

DC

ap-

plied

to

terminals

Kl

and

K2 on

the

amplifier

terminal

strip

will

energize

the

relay

and

apply

a

ground

to

the

cathodes

of

the

output

tubes,

placing

the

amplifier

in

its

"ready"

mode.

CONTROLS

AND

ADJUSTMENTS

Power

Output

Stage

Bias

Adjustment

-

DC

Balance

Controls

The

Bias

Adjustment

Control

provides

a

sufficient

degree

of

adjustment

to

allow

the

employment

of

unmatched

output

tubes

in

the

Power

Output

stage.

The

use

of

matched

pairs

of

output

tubes

however,

will

aid

in

bias

adjustment

and

provide

optimum

conditions

for

high

fi-

delity

output

and

peak

power.

Occasionally,

it

will

be

found

that

some

tubes

cannot

be

balanced

regardless

of

the

Bias

Adjustment

Control

setting;

when

this

occurs

replace

one

or

b6th

of

the

tubes

in

a

push

pull

pair

until

balance

is

obtained.

The

DC

Balance

Control

is

provided

to

allow

readjustment

of

the

amount

of

Plate

Current

in

the

output

stages

of

the

amplifier.

The

Bias

Adjustment

and

DC

Balance

Controls

have

been

adjusted

at

the

factory.

Should

further

adjustment

be-

come

necessary

they

should

be

adjusted

as

indicated

be-

low:

1.

Open

the

shorting

links

on

the

test

point

termi-

nals.

2.

3.

4.

5.

Prior

to

switching

the

amplifier

ON,

turn

the

Bias

Control

to

its

full

counter

clockwise

position.

Switch

ON

the

power

and

adjust

line

voltage

to

125

volts.

NOTE:

The

source

voltage

must

be

exactly

125 V. A.

C.

at

60

cps

and

provided

by

a

vari-

able

voltage

AC

source.

With

no

signal

applied

to

the

amplifier

input

conn~ct

a

voltmeter

(use

a

meter

with

a

DC

scale

capable

of

accurately

indicating

. 55

volts

DC)

between

test

points

A

and

B

and

B

and

C.

Adjust

the

DC

balance

until

equal

voltages

are

measured

between

each

test

point

(A

to B

and

B to

C).

If

a

zero

center

meter

is

available

connect

it

between

test

points

A

and

C

and

adjust

the

DC

Balance

Con-

trol

for

a

zero

reading

on

the

meter.

Reconnect

meter

to

test

point

A

or

C

and

chassis

ground.

Adjust

bias

control

for

• 55

volts

DC.

6.

If

necessary

readjust

the

DC

Balance

Con-

trol

until

• 55

volts

DC

is

measured

from

both

test

points

A

and

C

to

chassis.

Input

level

control

R3

is

a

500K

ohm

potentiometer

which

regulates

the

amplifier

output

by

attenuating

the

input

signal.

Rated

Load

Impedance

for

100

Watts

Output

Rated

Load

-

ohms

50

6.25

LOAD

IMPEDANCE

Rated

Output

-

voltage

70V

25V

The

use

of

line

matching

transformers

is

not

required

when

the

amplifier

output

feeds

a

single

speaker

or

is

divided

equally

among

a few

speakers

spaced

along

a

relatively

short

line.

The

accompanying

chart,

based

on

a

ldb

loss,

indicates

the

maximum

length

of

wire

to

be

used

with

a

specific

wire

size

and

impedance.

When

two

or

more

separate

speaker

lines

are

brought

to

an

ampli-

fier

choose

the

minimum

wire

size

for

each

line

sepa-

rately,

using

the

impedance

which

terminates

that

line.

OUTPUT

TERMINALS

A

O.:i?~~-'

"

GRD

.

70V4+t- ·

2sv...,..·

~1111!!1

CT---:~

25V

.

70V~\'..

Kl

,,

..

K2

[i.

. 0

/.

p~~

;;_~:~<a.~.

s,i@~-@1

11

0N

11

r8>lff

'"jl

sw1tcv-~

FUSE

115V

AUDIO

OUT

PILOT

LAMP

Wire

Line

Impedance

in

Ohms

Gauge

4 8

16

45

22 20

40

80 220

20 30 65

103

350

19 40 80

160

425

18 50 100

200

550

16 80 160 320 900

Wire

Gauge

78 156 312 625

22

400

800

1600

3200

20 500 1000

2000

4000

19

650

1300

2600 5200

18

800

1600

3200 6400

16 1200 2400

4800

--

Should

it

prove

necessary

to

provide

an

uneven

distri-

bution

of

audio

power

to a

number

of

speakers,

the

consta_nt

voltage

line

taps

(70

and

25

volts)

of

the

ampli-

fier

are

to

be

used.

By

connecting

line

matching

trans-

formers

to

each

speaker

it

is

possible

to

provide

the

desired

power

to

each

speaker

position.

The

total

power

drawn,

however,

is

not

to

exceed

the

rated

power

output

of

the

power

amplifier.

INPUT

TRANS.L

VEL

CONTROL

TEST

POINTS

''A"

7199

'

~

REPLACEMENT

PARTS

R3

R12,

R25

fl21

C3

C4

C5

ClO

Cll

C12

CRl,

CR2

SCHEMATIC

CPS

~

Resistors

Control,

Vol.

500K

Control,

Dual

Bias,

5K

Resistor,

10

ohm,

15W

Capacitors

50uf/3V

Elec.,

4uf/150V

Elec.,

120uf/350/80uf/200/

20uf/350V

Elec.,

120uf/350V

Elec.,

80uf/200V

Elec.,

50uf/50V

/50uf/50V

Diodes

Rectifier

(Plate

Supply)

"'

_47K

T2

PLUG

IN

TRANSFORMER

(

OPTJONAL)

R2

470K

c,o

120/350

CSA

ca

120/350

c"

80/200

CSB

t::.

80/200

R2 2

47

II

GE

1847

R23

47

CR3,

CR4

145000-136

CR5

145000-137

554567-100

Tl

T2

553088-500

111000-050

111000-111

111000-114

1'11000-115

111000-118

S2

Sl

162000-065

GENERAL

DYNAMICS

I ELECTRONICS

ROCHESTER

STROMBERG

-

CARLSON@

MODEL

NO.APH-1100

AMPLIFIER

VIB

B4V

1/2

7199

91V

•

41V

4/150

C6

47

R6

c,

R4

10%

50/3

470

IMEG

RB

5%

47K

300V

'"

R5.

-C5CO

470

20/350

Rectifier

(Screen

Supply)

Rectifier

(Bias

Supply)

Miscellaneous

Transformer,

Output

Transformer,

Power

Fuse

Holder

AC

Cord

Jumper,

Plug-in

Foot,

Chassis

Socket,

Pilot

Lamp

Socket,

Octal

GP

Socket,

Octal

LL

Switch

DPDT

Switch

AC

.

Lens,

Pilot

Socket,

9

Rl5

635V

*

6.BK

,.325V

*

2-

WHEN

BALANCED

10K

OHM

INPUT

IS

OESl~EO

REMOVE

JUMPER

FROM:

IN.PUT

iRANS

SOCKET

AND l~SER·T

!R:ANS

.(

G. D.#1610_00 -

065

J•

3-.ALL;

C~Pl;ICl·"'fORS:-rN,

MFO·:uNL(ss

OTHE"Rwfsf

SPECfF.I_E~.±.

20_%;

__

-~

·...' - · :

,------,

I I

4-

ALL

RE·s1si:O,R_s

_tN'OtiMS,

112

w±

10_%

tiNLEss·

OTHERWISE·

.SPECIFIE·o_.

.-

. I I

162000-063

162000-052

161000-188

161000-240

559996-102

117000-026

120000-062

131000-001

152000-072

15201_4-000

152668-000

158000-058

158000-183

559996:-071

559999-028

5-VOLTAGES

ARE±20%"AND

M·us"r

BE

MEASURED

~~I~Ai:sv"!R~~

SJ~N.AL.

*·

INDICATES.

~

I :

L

_______

_J

PLUG

IN

STANDBY

RELAY

(

OPTIONAL

)

PLl.jG

JN

JUMPER

-SEE

NOTE

I

STANDBY

RELAY

I

CR5

R25

R2'l

-'lOV

5K

3.9K

Cl2A~

R26

50/50

+ 12 K

Cl28

+

50/50

D

5·-

~bfis;E~~

~~lt\~~NK:IA~N~OUJN~~~

...

~as

tig~T;L

-~~~~~r;~o~s

AND

B

ANO

C

THEN

REPLACE

LINKS.

7 - TO

OBTAIN

115

VOLT

OUTPUT

PLACE

JUMPER

FROM GRO

TO

THE

ADJACENT

70

V TERM

ON

OUTPUT

TERMINAL

BOARD.

8 -

SEE

INSTRUCTION

MANUAL

FOR

ADDITIONAL

INFORMATION

9 -

c::::::::J

INDICATES

EQUIPMENT

MARKING•

•

I-

WHEN REMOTE OPERATION IS

DESIRED,

REMOVE

JUMPER

FROM STANDBY

RELAY

SOCKET

ANO

INSERT

RELAY

{G.0.#172000-015).

PRINTED

IN

THE

u'.S.A.

Stromberg-Carlson APH-1100 Manual

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