Harman Kardon A250 Owners Manual - Page 7

No

further

connections

need

be

made

to

your

old

monaural

amplifier.

Pro

-

;ram

sources

such

as

tuner,

tape,

phonograph,

etc.,

are

connected

to

the

appro-

]oriate

receptacles

on

the

A-250

as

described

under

stereo

installation.

.ead

Dress:

k

black

plastic

clamp

is

located

on

the

rear

of

the

chassis

near

the

input

o

receptacles.

Remove

the

rubber

clamp

on

the

upper

portion

of

the

block,

insert

the

shielded

leads

into

the

clamp

assembly

and

replace

the

rubber

clamp.

This

1

will

offer

a

neat

installation.

OPERATING

YOUR

MODEL

A-250

AS

A

CONVERSION

AMPLIFIER

Operation

of

the

Model

A-250

as

a

stereo

conversion

amplifier

is

identical

with

its

operation

as

a

normal

stereo

amplifier.

The

controls

of

the

old

monaural

amplifier,

now

being

used

as

one

channel

of

yoUr

new

stereo

system,

must

be

properly

set,

however,

and

then

left

permanently

in

that

setting.

Set

the

tone

controls

and

contour

switch

to

fiat,

the

rumble

and

scratch

fi

lter

switches

to

off,

and

the

function

selector

to

AUX

or

TUNER,

depending

on

which

input

re-

ceptaele

was

used

for

connecting

to

the

A-250.

.

Set

the

VOLUME

control

on

your

old

amplifier

to

minimum

and

adjust

:the

BALANCE

Control

on

your

Model

A-250

to

the

mid

-point.

Play

a

stereo

record

or

tape

and

turn

the

LOUDNESS

Control

on

your

A-250

up

to

a

normal

listening

volume.

The

left

channel

will

be

inoperative

since

the

volume

control

•

on

your

old

amplifier

is

set

at

minimum.

Now

slowly

rotate

the

volume

control

:1,H

on

this

amplifier

until

the

loudness

of

the

two

channels

is

equal.

Allow

the

vol-

.

.

.Hume

control

on

your

second

amplifier

to

remain

in

this

position

permanently.

ADDITIONAL

INFORMATION

Speaker

Phasing:

When

more

than

one

speaker

is

used

in

any

music

reproducing

system

they

must

be

connected

in

such

a

way

as

to

aid

each

other,

rather

than

to

work

against

each

other.

Since

two

speakers

must

be

used

for

stereo

reproduction,

this

caution

applies.

Checking

for

phase,

and

correcting

if

necessary,

is

quite

simple,

and

is

done

at

the

time

of

installation

of

the

system.

Play

a

record

with

readily

apparent

bass

tones.

Listen

carefuly

to

the

strength

and

clarity

of

the

bass.

Now

reverse

the

connections

of

one

of

the

speakers.

If

the

bass

notes

are

now

louder

and

clearer,

the

speakers

are

now

correctly

phased.

If

the

bass

seems

weaker,

the

original

connection

was

correct.

How

To

Play

A

Monaural

LP

Record:

If

you

have

been

playing

stereo

records,

merely

remove

the

stereo

record

and

put

on

a

monaural

record.

It's

as

simple

as

that!

All

stereo

record

players

and

phonographs

are

completely

compatible

with

monaural

LP

records.

LP's

and

stereos

may

he

intermixed

on

any

good

stereo

record

changer.

System

Hum

and

Noise:

In

any

high

fi

delity

intallation,

hum

may

be

caused

by

the

interconnection

of

a

record

changer,

tuner

and

amplifier,

as

a

result

of

the

cables

and

different

grounds.

A

good

way

to

eliminate

this

problem

is

to

fi

rst

disconnect

everything

but

the

speakers

from

the

amplifier,

and

listen

for

hum.

If

the

hum

persists,

make

the

balance

adjustments

described

below.

Try

reversing

the

amplifier

power

plug.

Now

plug

in

the

record

player.

If

hum

appears,

try

reversing

the

record

player

power

plug,

and

try

connecting

a

wire

from

the

record

player

chassis

to

the

amplifier

chassis.

In

this

way,

connect

the

tuner,

tape

deck

and

other

de-

'

-es

in

turn.

Note

that

hum

may

be

picked

up

by

defective

interconnecting

cables,

and

by

:connecting

cables

running

too

close

to

power

cables.

Harman Kardon A250 Owners Manual - Page 7

Dress, Operating, Model, A-250, Conversion, Amplifier, Additional, Information, Speaker, Phasing,

Page 7 highlights