Harman Kardon HK20 User manual

MODEL

HK20

POWER

AMPLIFIER

INSTRUCTION

MANUAL

essential

you

read

this

instruction

booklet

carefully

before

installing

your

high

fidelity

system.

You

have

invested

extremely

fine

electronic

instrument

into

which

many

excellent

engineering

developments

have

been

incorporated,

and

each

important

for

the

proper

operation

your

system.

This

booklet

has

been

written

simple

non-technical

language

and

you

will

take

time

read

first

before

doing

anything

else,

you

will

find

simple

obtain

optimum

performance

from

your

Harman-Kardon

Amplifier.

sure

keep

this

booklet

available

all

times.

contains

indispensable

technical

and

service

information.

UNPACKING

After

unpacking

the

HK20,

inspect

carefully

for

signs

transit

damage.

The

unit

was

subjected

many

inspections

and

tests

prior

final

packing,

and

therefore

should

perfect

condition.

damage

visible,

notify

your

dealer

once.

the

unit

was

shipped

you,

notify

the

transportation

company

without

delay.

Check

the

contents

the

carton

thoroughly

and

inspect

the

folds

the

packing

material

before

discarding

it.

Your

package

should

contain

the

following

items:

Model

HK20

Basic

Power

Amplifier.

Instruction

Booklet.

Warranty

Card.

WARRANTY

POLICY

urge

you

completely

fill

your

warranty

card

and

mail

the

fac-

tory

without

delay

protect

your

rights

under

warranty.

The

warranty

cards

-are

carefully

filed

for

reference

and

should

you

require

information

the

use

this

high

fidelity

unit,

repair

service,

will

able

immediately

identify

your

set

and

quickly.

NOTE:

necessary

receive

factory

authorization

before

returning

set

for

warranty

repair

either

the

factory

authorized

station.

Repairs

are

returned

Express

Prepaid

basis.

letter

describing

the

exact

diffi-

culty

must

enclosed

with

the

unit.

WARRANTY

warrant

each

Model

HK20

free

from

defects

material

and

workmanship

under

normal

use

and

service,

and

accordance

with

the

condi-

tions

herein

below

set

forth,

for

period

year

from

date

delivery

the

original

purchaser,

and

agree

replace

repair

any

part

parts,

with

the

exception

tubes

which

are

under

the

manufacturer's

day

warranty,

returned

within

said

year,

with

transportation

prepaid

and

which

our

examination

shall

disclose

our

satisfaction

have

been

thus

defective.

This

warranty

does

not

include

free

labor,

nor

applicable

any

instrument

which

shall

have

been

repaired

altered

any

way

our

judgment

affect

its

stability

reliability

nor

which

has

been

subject

neglect,

misuse,

abuse,

negligence

accident

nor

which

has

had

the

serial

number

altered,

effaced,

removed.

Neither

shall

this

warranty

apply

any

instrument

which

has

been

connected

otherwise

than

accordance

with

instructions

furnished

us.

This

warranty

expressly

lieu

all

other

warranties,

express

implied,

and

all

other

obligations

liability

our

part,

and

neither

assume

nor

authorize

any

representative

other

person

assume

for

any

other

liability

connection

with

the

sale

this

instrument.

USING

THE

HK20

POWER

AMPLIFIER

INSTALLATION

PROCEDURE

Ventilation:

The

unit

well

ventilated

itself,

but

sufficient

space

must

allowed

around

permit

proper

air

flow.

Install

the

amplifier

manner

allow

for

unrestricted

circulation.

not

place

books

other

objects

the

cage

the

immediate

vicinity

the

instrument.

Reducing

the

air

flow

will

result

sharply

reduced

component

and

tube

life.

Power

Requirements:

Plug

the

cord

into

any

outlet

furnishing

117

volts

cycle

cur-

rent.

The

voltage

may

vary

between

105

and

125

volts.

REAR

PANEL

CONNECTIONS

SPEAKER

(I7VAC-60%

Liles

INPUT

com

)

LEVEL

(@)

CONTROL

(

‘y

3AG

REAR

PANEL

MODEL

HK20

Connecting

Your

Speaker:

The

SPEAKER

OUTPUT

terminal

strip

located

the

rear

the

chassis.

you

are

using

ohm

speaker

connect

one

speaker

lead

the

ohm

termi-

nal

and

the

other

lead

COM.

For

ohm

speaker

connect

one

speaker

lead

the

ohm

terminal

and

the

other

lead

COM.

Input

Connection:

connect

your

HK20

monaural

preamplifier

attach

the

shielded

cable

supplied

with

the

amplifier

between

the

INPUT

jack

the

HK20

and

the

out-

put

jack

the

preamplifier.

you

are

connecting

the

HK20

the

AX20

con-

verter

connect

the

shielded

lead

between

the

HK20

INPUT

jack

and

the

LEFT

PREAMP

OUT

jack

the

AX20.

Input

Level

Control:

This

control

adjusts

the

gain

the

HK20

power

amplifier.

For

monaural

application

should

set

maximum.

For

stereo

use

set

balance

your

other

amplifier.

When

used

conjunction

with

the

Harman-Kardon

AX20,

the

INPUT

LEVEL

control

should

used

the

following

manner.

Turn

the

INPUT

LEVEL

control

the

HK20

zero.

Turn

the

volume

control

your

AX20

normal

listening

level,

and

set

the

balance

control

the

mid-position.

Play

stereo

record

tape.

The

left

channel

should

completely

in-

operative

since

the

INPUT

LEVEL

control

the

HK20

set

zero.

Slowly

rotate

the

HK20

INPUT

LEVEL

control

until

the

left

channel

perfectly

balances

the

right.

Allow

the

INPUT

LEVEL

control

remain

set

this

position.

Further

adjustment

should

not

necessary.

All

additional

channel

balancing

should

made

with

the

balance

control

the

AX20

converter.

ADJUSTMENTS

Hum

Adjust

Control:

This

control

accessible

from

the

underside

the

chassis

with

the

bottom

plate

removed

and

from

the

top

the

unit

with

the

cage

removed.

physi-

cally

located

between

the

EZ81

rectifier

tube

and

the

6CG7.

adjust,

allow

the

amplifier

thoroughly

warm

up.

Disconnect

the

input

from

the

preamplifier

stage

and

turn

the

INPUT

LEVEL

control

maximum.

While

listening

the

hum

level

your

speaker,

turn

the

HUM

ADJUST

con-

trol

for

minimum

hum.

Output

Tube

Balance

Control:

The

BALANCE

control

accessible

from

the

underside

the

chassis

with

the

bottom

plate

removed

and

from

the

top

the

unit

with

the

cage

re-

moved,

physically

located

between

the

EL84

output

tubes.

This

control

preset

the

factory

and

should

not

touched

unless

the

output

tubes

are

changed

periodic

yearly

check

required.

When

adjustment

necessary

the

outlined

procedure.

Turn

the

INPUT

LEVEL

control

the

HK20

minimum.

Remove

the

shielded

connecting

cable

from

the

INPUT

jack.

Slowly

rotate

the

OUTPUT

TUBE

BALANCE

control

for

minimum

hum

your

speaker.

the

hum

level

inaudible,

set

the

OUTPUT

TUBE

BALANCE

con-

trol

the

exact

center

position.

For

those

who

demand

supercritical

adjustment

this

control,

the

adjustment

should

made

with

analyzer.

6CG7

.05/400V

SOOK

LEVEL

CONTROL

RV2472952

220K

1.5K

RESISTANCE

CHART

tee

fae

dos

eee

~iom|

o_[rse

[iso

[180

aan

470K

150

150_|

150

>500K

iwecer_[

avon]

iso

[iso

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veezei

[es

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|_|

LEVEL

CONTROL

MIN.

GAIN

NOTE:

UNLESS

OTHERWISE

SHOWN

ALL

RESISTORS

1/2

WATT

410%

ALL

CAPACITOR

VALUES

WITH

DECIMAL

PAPER

MFD

ALL

CAPACITOR

VALUES

WITHOUT

DECIMAL

GENERAL

PURPOSE

CERAMICS

SOOWVDC

MMF

ALL

VOLTAGES

ARE

ALL

RESISTANCES

ARE

OHMS

$247

24730184

[C40

JE220297

C4a=40MF

C4b=40MF

C4c=100MI

Rel

100

HUM

ADJ.

RVCOM2E

R13

68K

.05/600V

ewes

340V

50-20%

Ris

470K

FT2202785

20%

BLU/WH

icaey

eee

RIO

BALANCE

RVCOM2569

REO/BLU

!00

270-1W

RII

470K

RIS

.05/600V

—

220-20%

[HOW

EL84

S75V

6BQ5

RI2

R20

>39-Iw

R22

sear

JE2202842

Cac

C5a:40MFD.-450V.1

|[C5b

C50}

cent

C5b=50MFD

~—350v,

—

}

—

300V.

-300V.

D.-25V.

BROWN

FT2202784

BROWN/WH

1/2

A-3

BLK/WH

BLK

H7VAC-60%

Audio

Circuits:

Output

Level:

Peak

Power

Output:

Output

Impedance:

Frequency

Response:

Damping

Factor:

Hum:

Sensitivity:

Fuse:

Tube

Complement:

Dimensions:

Power

Consumption:

Shipping

Weight:

SPECIFICATIONS

EL84’s

self

biased,

pentode

connected

push-pull.

watts

less

than

harmonic

distortion.

watts

less

than

0.5%

harmonic

distortion.

watts

less

than

0.2%

harmonic

distortion.

watts

less

than

intermodulation

distortion.

Harmonic

distortion

readings

1000

c.p.s.;

Inter-

modulation

distortion

readings

60/6000

c.p.s.;

4:1;

All

ohm

load—120

volts

watts.

and

ohms,

0.5

15-30,000

c.p.s.

watt.

J.0

20-20,000

c.p.s.

watts.

below

watts.

0.5

volts

Externally

accessible

(Total

1-EZ81,

2-EL84,

1-6CG7

107

wd"

x4"

watts

Ibs.

MAINTENANCE

AND

REPAIRS

Fuse:

the

event

potentially

damaging

failure

tubes

components,

the

Model

HK20

protected

ampere,

type

3AG

fuse,

located

the

rear

the

unit.

this

fuse

blown,

should

replaced

only

with

one

the

same

rating.

Replacing

with

fuse

higher

rating

will

not

protect

the

amplifier,

and

may

result

severe

damage,

which

will

not

covered

the

factory

warranty.

Routine

Maintenance:

Due

the

conservative

design

and

high

quality

componets

the

Model

HK20,

routine

maintenance

other

than

yearly

tube

checking

advised.

Oc-

casional

resetting

the

hum

and

output

balance

adjustments,

following

the

procedure

described

above,

will

keep

the

unit

operating

peak

efficiency.

These

adjustments

should

certainly

made

after

any

tube

replacement.

Repair:

Only

the

most

qualified

service

technician

should

employed,

special

equipment

and

training

required

properly

service

high

fidelity

amplifier.

This

manual

contains

information

great

value

the

repairman,

and

should

kept

available.

Factory

Warranty

Stations

are

maintained

most

major

cities.

For

the

ad-

dress

the

nearest

one,

for

any

other

information

relating

your

Harman-

Kardon

products,

write

the

attention

the

Customer

Service

Department,

Harman-Kardon,

Inc.,

520

Main

St.,

Westbury,

N.Y.

sure

include

the

model

and

serial

number

the

set

question.

short

description

your

complete

installation

often

help

answering

your

questions.

LIST

REPLACEABLE

PARTS

Part

No.

Description

List

Price

ZCOM2953

Fuse

RVCOM2569

Balance

Control

RV2472952

Level

Control

.90

JE2202842

Electrolytic

3.00

JE2202974

Electrolytic

3.00

2202784

Power

Transformer

14.75

2202785

Output

Transformer

15.00

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