RCA BA-13A - Amplifier Output Connections

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4

OUTPUT

RECEPTACLE

J-2

Terminal

No.

Connection

AMPLIFIER

OUTPUT

CONNECTIONS

Load

Impedance

Receptacle

Terminals

center

tap

(terminals

number

4,

■i

Matching

Input

Connections

Connect

the

incoming

line

to

terminals

number

11

and

12

of

the

input

receptacle

for

input

plug

J-

1.

Refer

to

figures

3

and

8.

Make

impedance

matching

connections

as

follows:

Output

transformer

—

5-ohm

tap

Output

transformer

—

center

tap

A-C

input

to

power

transformer

A-C

input

to

power

transformer

Output

transformer

—

7.

5-ohm

tap

Output

transformer

—

center

tap

Output

transformer

—

1

5-ohm

tap

Output

transformer

—

Center

tap

Output

transformer

—

600

ohms

Output

transformer

—

600

ohms

A-C

Power

Supply

Connect

the

a-c

line

for

the

amplifier

to

terminals

number

5

and

6

of

the

output

receptacle

(for

output

3

4

5

6

7

8

9

10

11

12

*600

ohms

1

50

ohms

1

5

ohms

7.5

ohms

5

ohms

11

and

12

10

and

11

9

and

10

7

and

8

3

and

4

i

i

*600-ohm

winding

has

a

8

and

10

on

J-2

).

on

input

transformer

T-l.

At

terminal

number

2,

disconnect

the

wire

to

terminal

number

11

and

connect

it

to

terminal

number

5.

Connect

terminals

number

1

and

2

together,

and

con



nect

terminals

number

3

and

4

together.

Refer

to

figures

2

and

8.

d.

1

50-OHM

UNBALANCED

INPUT.

—

Remove

the

wire

connecting

terminals

number

2

and

3

on

T-l.

At

terminal

number

2,

disconnect

the

wire

to

terminal

number

11

and

connect

it

to

terminal

number

1.

Connect

terminals

number

1

and

2

together

and

connect

terminals

number

3

and

4

together.

Connect

the

grounded

side

of

the

incoming

line

to

terminal

11

on

the

receptacle

for

plug

J-l.

Output

Connections

The

amplifier

is

wired

for

operation

into

a

variety

of

load

impedances.

The

secondary

winding

of

the

output

transformer

T-2

is

provided

with

a

number

of

taps

which

are

brought

out

to

the

terminals

of

the

connection

plug

J-2

mounted

on

the

rear

of

the

amplifier

chassis

(directly

behind

the

power

transformer).

The

center

tap

of

the

output



transformer-secondary

winding

(terminal

number

8

on

the

output

transformer)

is

connected

to

terminals

number

4,

8

and

10

of

the

connection

plug

J-2.

Refer

to

figures

2

and

8.

Connection

to

the

plug

J-2

is

made

by

means

of

one

of

the

receptacles

supplied

with

each

amplifier.

The

following

table

shows

line

connections

for

loads

of

various

impedance:

Balanced

Bridging

Input

Connections

Connect

the

incoming

line

to

terminals

number

5

and

6

on

the

input

receptacle

for

plug

J-l,

figures

3

and

8.

Connect

terminals

number

7

and

12

together,

and

connect

terminals

number

9

and

11

together,

on

the

same

receptacle.

The

input

trans



former

is

connected

as

in

(a)

under

Matching

Input

Connections.

Input

Shielding

All

audio

leads

should

be

shielded

twisted

pair

copper

wire,

insulated

for

200

volts,

and

need

not

be

larger

than

No.

19

A.W.G.

All

joints

should

be

securely

soldered,

and

of

low

resistance.

If

the

circuits

run

in

conduit

or

duct

which

may

be

subject

to

moisture,

a

type

of

wiring

having

a

natural

or

synthetic

rubber

covering

over

the

shield

or

lead

should

be

used.

To

minimize

un



desirable

noise

pickup

and

cross

talk

on

long

input

circuits,

the

shielding

of

the

lines

to

the

input

terminals

of

the

amplifier

or

rack

should

be

covered

with

a

cotton

braid

or

other

suitable

insulation

and

the

shielding

should

be

grounded

only

at

the

amplifier

(point

of

lowest

level).

Make

sure

that

the

shields

are

electrically

continuous

and

that

the

ground

connections

are

perfect.

Do

not

run

the

audio-input

leads

adjacent

to,

or

laced

in

with,

a-c

or

high-level

audio

lines.

a.

600-OHM

BALANCED

INPUT.

—

The

ampli



fier

is

wired

at

the

factory

for

this

type

of

operation.

Terminals

number

2

and

3

on

input

transformer

T-l

are

connected

together,

terminals

number

2

and

11

are

connected

together.

Refer

to

figures

2

and

3.

b.

600-OHM

UNBALANCED

INPUT.

—

Discon



nect

from

terminal

number

2

on

T-l

the

wire

which

is

connected

to

terminal

number

11,

and

connect

it

to

terminal

number

1.

Connect

the

grounded

side

of

the

incoming

line

to

terminal

number

11

on

the

receptacle

for

plug

J-l.

c.

1

50-OHM

BALANCED

INPUT.

—

Remove

the

wire

connecting

terminals

number

2

and

3

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