Harman Kardon STEREO RECITAL TA224 Owners Manual - Page 14

player

and

if

hum

appears,

reverse

the

record

player

power

plug

and

connect

a

single

lead

from

the

record

player

chassis

to

a

good

ground

point

on

the

chassis

of

the

TA224.

Connect

your

other

devices

in

this

manner.

CAUTION:

Hum

may

be

also

induced

by

defective

connecting

cables

or

by

running

these

cables

too

close

to

a

strong

AC

fi

eld.

Hum

Balance:

A

HUM

BALANCE

potentiometer

is

located

on

top

of

the

chassis

directly

behind

the

7408

output

tubes.

Set

the

Function

Selector

to

the

Auxiliary

position

and

disconnect

any

equip-

ment

connected

to

the

Auxiliary

input

receptacles.

Turn

the

Volume

control

to

maximum.

Slowly

rotate

the

HUM

BALANCE

potentiometer

until

the

hum

dis-

appears

or

is

at

its

lowest

level.

This

control

may

be

set

anywhere

within

its

rotation

to

obtain

minimum

hum.

Output

Tube

Balancing

Controls:

There

are

two

OUTPUT

TUBE

BALANCING

CONTROLS

located

on

the

top

of

the

chassis

near

the

output

tubes.

These

controls

are

factory

adjusted

and

should

not

be

touched

unless

tubes

are

changed.

If

adjustment

is

necessary

fol-

low

the

procedure

listed

below.

1.

Set

the

LOUDNESS

CONTROL

to

minimum.

2.

Slowly

rotate

each

BALANCING

CONTROL

for

minimum

hum.

3.

If

the

hum

level

is

not

readily

apparent,

set

the

control

to

the

mid

-position.

4.

For

absolute

accuracy

use

an

IM

analyzer

and

set

for

lowest

IM

distortion.

Replacing

Output

Tubes:

It

is

permissible

to

replace

the

7408

output

tubes

of

this

receiver

with

6V6GT's.

This

may

cause

a

slight

power

loss

and

a

slight

increase

in

intermodula-

tion

distortion.

Fuse:

This

receiver

is

fused

in

the

AC

primary

with

a

4

amp-1\4TH

fuse.

It

is

lo-

cated

on

top

of

the

chassis.

Replace

if

necessary,

only

with

the

same

size

used.

Tube

Checking

and

Service:

It

is

recommended

to

test

the

tubes

of

this

receiver

every

twelve

months

in

order

to

insure

optimum

performance.

When

a

tube

is

changed

in

the

tuner

por-

tion,

it

may

be

necessary

to

have

the

instrument

recalibrated

and

realigned.

If

this

instrument

should

not

perform

properly

during

the

fi

rst

year

after

date

of

purchase,

contact

the

factory

for

instructions.

DO

NOT

have

it

repaired

locally

without

fi

rst

contacting

Harman-Kardon

for

advice.

The

factory

has

many

authorized

warranty

service

stations

in

the

United

States,

and

for

the

station

nearest

you,

please

write

or

call

our

Customer

Service

Department,

Harman-

Kardon,

Inc.

Plainview,

L.

I.,

New

York.

Be

sure

to

include

the

model

and

serial

number

of

the

unit.

A

brief

description

of

your

other

components

is

often

of

help

in

answering

your

questions.

Harman Kardon STEREO RECITAL TA224 Owners Manual - Page 14

Balance, Output, Balancing, Controls, Replacing, Tubes, Checking, Service

Page 14 highlights