Harman Kardon STRATOPHONIC Series Manual de usuario

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1

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AMES

COURT,

PLAINVIEW,

L.

I.,

N.Y.

fait

kardon

|

A

SUBSIDIARY

OF

THE

JERROLD

CORPORATION

90722322

INSTALLATION

AND

OPERATION

MANUAL

STRATOPHONIC

SERIES

MODEL

SR9YODOB

arigest-la

Kardon

|

SOLID-STATE

STEREOPHONIC

RECEIVER

SPECIFICATIONS

FOR

SRSOOB

STRATOPHONIC

RECEIVER

A.

Amplifier

Music

Power

Output

at

4

ohms

Full

Power

Bandwidth

Harmonic

Distortion

20--20KC

Mrequency

Response

*

{db

Damping

Factov

Square

Wave

Rise

‘Lime

{Yuin

and

Noise

Input

Sensitivity

Phono

Tape

Head

Auk,

Tone

Controls

Speaker

Inipedanice

High

Cut

Filter

Low

Cut

Hilter

100

watts

5-60

KC

Jess

than

0.2%

2-100

KC

AQti

22

us

945

db

2.5

Vv

2.9

TON

200

tiv

+14

db,

---L0

db

4.16

olims

-—

6

db

at

LO

KC

---

10

db

at

50

cps

B.

Tuner

Useable

Sensitivity

Image

Rejection

better

than

Spurious

Response

Rejection

better

than

Frequeney

Response

Distortion

beiter

(hai

Multiplex

Separation

Antenna

bapedance

C.

General

Input

Receptacles:

Mapnetic

Phono

Tape

Head

Ceramic

Phono

Auxiliary

Tape

Monitor

Output

Receptacles

Tape

Out

1.85

uv

710

db

85

db

#O.S

db

0.3%

AQ

db

300

ohing

~

I

“

Yniroduction

YOUR

NEW

STRATOPHONIC

RECEIVER

We

know

how

anxious

you

are

to

try

your

new

Stratophonic

Recciver.

But

a

few

cxtra

moments

of

paticnce

spent

in

carefully

reading

this

instruction

book

will

pay

vast

dividends

in

the

ultimate

enjoyment

of

your

component,

It

is

customary,

at

this

time,

to

congratulate

you

on

the

wise

decision

you

have

made

in

the

purchase

of

your

new

Stratophonic

Solid-State

Receiver.

This,

we

most

certainly

do.

You

should

also

know

that

it

is

the

culmination

of

several

years

of

intensive

research

in

solid-state

technology.

Your

Stratophonic

Receiver

is

literally

born

of

space-age

development,

Thus,

you

have

invested

in

the

finest

stereophonic

integrated

music

center

available.

It

truly

represents

the

state-of-the-art

in

its

ability

to

reproduce

life-like

music,

And,

because

of

advanced

solid-state

reliability

and

construction,

your

new

Stratophonic

Receiver

will

continue

to

provide

the

ultimate

subteltics

of

every

musical

nuance.

But,

this

alone

is

not

enough.

Your

new

Stratophonic

Receiver

has

also

been

designed

for

maximum

versatility.

The

simple

movement

of

a-switch

or

control

makes

you

master

of

every

program

source---tape,

disc

and

FM—mono

and

stereo,

And,

Harman-Kardon

designers

have

endeavored

to

make

your

Strato-

phonic

Recciver

a

major

asset

to

home

decor.

Now,

go

on

to

a

new

cxpericnce—Stratophonic

Sound—the

experience

of

hearing

music

as

you

have

never

heard

it

before.

KEEP

THIS

BOOK

AVAILABLE

AT

ALL

TIMES

FOR

IT

CONTAINS

INDISPENSABLE

TECHNICAL

AND

SERVICE

INFORMATION,

J

General

Information

UNPACKING

After

unpacking

the

SR900,

inspect

it

carefully

for

signs

of

transit

damage.

The

receiver

was

subjected

to

numerous

rigid

quality

control

inspections

and

therefore

should

be

in

perfect

operating

condition.

If

damage

1s

visible,

notify

your

dealer

at

once.

If

the

receiver

was

shipped

to

you,

notify

the

transportation

company.

Harman-Kardon

will

cooperate

with

you

in

such

instances,

but

please

note

that

only

you

can

recover

from

the

carrier

for

damages

incurred

during

shipment.

WARRANTY

POLICY

We

urge

you

to

fill

in

your

warranty

card

and

mail

it

to

the

factory

without

delay

to

protect

your

rights

under

warranty,

The

Haman-Kardon

warranty

is

not

valid

unless

we

have

your

card

on

file.

WARRANTY

We

warrant

each

$R900

to

be

free

from

defects

in

material

and

workman-

ship

under

normal

use

and

service,

and

in

accordance

with

the

conditions

herein

below

set

forth,

for

a

period

of

2

years

from

date

of

delivery

to

the

original

pur-

chaser,

and

agree

to

replace

or

repair

any

part

or

parts,

returned

to

us

within

said

2

years,

with

transportation

prepaid

and

which

our

examination

shall

disclose

to

our

satisfaction

to

have

been

thus

defective,

This

warranty

does

not

include

free

labor,

nor

is

it

applicable

to

any

instrument

which

shall

have

been

repaired

or

altered

in

any

way

so

as

in

our

judgment

to

affect

its

stability

or

reliability

nor

which

has

been

subject

to

neglect,

misuse,

abuse,

negligence

or

accident

-nor

which

has

had

the

serial

number

altercd,

effaced,

or

removed.

Neither

shall

this

warranty

apply

to

any

instrument

which

has

been

connected

otherwise

than

in

accordance

with

instructions

furnished

by

us.

os

This

warranty

is

expressly

in

lieu

of

all

other

warranties,

express

or

implied,

and

of

all

other

obligations

or

liability

on

our

part,

and

we

neither

assume

nor

authorize

any

representative

or

other

person

to

assume

for

us

any

other

liability

in

connection

with

the

sale

of

this

instrument.

SERVICE

POLICY

Harman-Kardon

has

established

a

special

consumer

division

to

answer

all

questions

pertinent

to

the

installation

and

operation

of

your

unit.

Please

feel

free

to

Z

write

us

at

any

time

and

we

will

endeavor

to

offer

prompt

and

complete

advice.

If

your

problem

cannot

be

resolved

through

our

combined

efforts

we

may

wish

to

refer

you

to

one

of

our

authorized

warranty

stations,

The

unit

must

be

shipped

via

Railway

Express,

Prepaid

to

the

station

designated,

accompanied

by

a

brief

note

describing

the

exact

nature

of

the

difficulty.

Under

no

circumstances

should

the

set

be

shipped

directly

to

the

factory

without

prior

authorization.

Ynstallation

Preece

VENTILATION

Sufficient

space

must

be

allowed

around

the

SR900

to

permit

unrestricted

air

flow

for

maximum

circulation.

This

will

insure

low

operating

temperatures

which

will

result

in

extended

component

life.

The

SR900

chassis

is

constructed

of

steel

together

with

a

heavy

gauge

aluminum

rear

panel

which

acts

as

a

heat

sink

(a

device

which

dissipates

heat)

for

the

output

transistors,

This

area

will

become

hot

under

normal

use.

This

is

normal

and

should

not

be

cause

for

concern.

Do

not

place

books

or

other

objects

on

the

cage

or

in

the

immediate

vicinity

of

the

receiver.

When

mounting

your

SR900

into

an

equipment

cabinet

the

following

precautions

must

be

observed.

1.

Allow

at

least

3

inches

above

the

top

cover

of

the

unit.

2.

Allow

at

least

1

inch

on

each

side

of

the

chassis.

3,

Cut

the

mounting

shelf

in

accordance

with

the

instructions

on

the

mounting

template.

4,

Leave

the

back

of

your

equipment

cabinet

open

to

insure

proper

venti-

lation.

POWER

REQUIREMENTS

Connect

the

AC

line

cord

into

any

outlet

furnishing

117

volts,

50

or

60

cycle

AC

current.

The

voltage

may

vary

between

105

and

125

volts.

An

AC

convenience

outlet

is

located

on

the

rear

panel

of

the

recciver.

This

outlet

is

“switched”

and

is

controlled

by

the

on/off

switch

on

the

front

panel.

Any

auxiliary

equipment

may

be

plugged

into

this

outlet.

The

rating

of

this

equipment

should

not

exceed

200

watts,

CONNECTING

THE

SPEAKERS

FOR

STEREO

OPERATION

(1

SYSTEM)

Your

two

speakers

should

be

identical,

if

possible,

to

obtain

optimum

results.

Experts

agree

that

a

perfectly

matched

system

offers

the

best

stereophonic

repro-

duction,

The

speakers

should

be

placed

along

the

same

wall

approximately

8

to

10

feet

apart

depending

upon

room

size

and

furniture

placement.

It

may

be

necessary

to

experiment

with

speaker

placement

until

best

results

are

obtained.

Use

any

type

of

wire

to

connect

your

speakers

to

the

SR900,

Lamp

cord

“Zin

cord”

is

excellent

and

may

be

easily

dressed

around

the

molding

for

an

inconspicuous

and

neat

installation.

Do

not

drive

the

staples

or

tacks

through

the

center

of

the

wire

for

this

may

short

out

the

two

sections

and

will

decrease

the

overall

volume

or

short

out

the

speakers

entirely.

It

is

permissible

to

use

approxi-

mately

50

feet

of

speaker

connecting

wire

for

each

speaker

without

loss

of

volume.

CONNECT

SPEAKERS

WITH

CARE.

AVOID

SHORTS-—-RECEIVER

HAS

BEEN

DESIGNED

TO

PREVENT

DAMAGE

FROM

ACCIDENTAL

SHORT-

ING;

HOWEVER,

REPETATIVE

SHORTING

CAN

DAMAGE

TRANSIS-

TORS.

1,

Connect

one

length

of

lamp

cord

to

the

left

speaker.

(This

is

the

speaker

on

your

left

as

you

face

the

speakers.

This

speaker

will

now

be

referred

to

as

Channel

A.)

2.

Attach

the

other

end

of

the

lamp

cord

to

the

terminals

marked

SYSTEM

1

CHAN

A

located

on

the

rear

of

the

SR900.

3,

Similarly

connect

another

length

of

lamp

cord

to

your

right

speaker.

(This

speaker

will

now

be

referred

to

as

Channel

B.)

en

|

CONNECT

SPEAKERS

WITH

A

6

CARE—AVOID

ACCIDENTAL

SHORTS

DIAGRAM

A

H907ZO6504

4.

Attach

the

other

end

of

the

lamp

cord

to

the

terminals

marked

SYSTEM

|

CHAN

B.

5.

Your

receiver

is

now

connected

for

|

system

stereo

operation

and

is

opera-

tive

when

the

speaker

selector

switch

on

the

front

panel

is

in

the

System

1

or

System

1

&

2

position.

SPEAKER

PHASING

When

more

than

one

speaker

is

used

in

any

music

reproducing

system

the

speakers

must

be

connected

in

a

manner

to

work

together

rather

than

work

out

of

phase.

If

one

speaker

is

pushing

air

out

while

the

other

is

moving

in

the

opposite

‘direction

this

will

result

in

diminishing

bass

response.

Checking

for

proper

phase

and

correcting

if

necessary

is

quite

simple.

1.

Place

a

stercophonic

recording

on

your

record

player.

2.

Pull

the

“Stereo-Mono”

switch

on

the

BALANCE

control

to

its

“Out”

position

for

monophonic

playback.

3.

Play

the

record.

The

sound

should

emerge

from

approximately

the

center

area

between

the

two

speakers.

4.

While

the

record

is

playing

push

the

“Stereo-Mono”

switch

“In”

to

the

stercophonic

position.

5.

The

sound

should

now

move

across

the

wall

of

the

room

and

should

appear

to

come

from

both

speakers

as

well

as

the

center.

6.

If

your

speakers

are

out

of

phasc,

the

sound

source

will

not

pinpoint

itself

between

the

two

speakers

when

the

Sterco-Mono

switch

is

in

the

monophonic

position.

Instead

it

will

appear

to

come

from

both

sides.

If

the

speakers

are

out

of

phase,

turn

off

the

receiver

and

disconnect

both

leads

from

either

the

left

or

right

speaker

and

reverse

them.

Your

system

will

now

be

in

phase.

This

completes

your

speaker

connections.

The

SR900

is

a

solid

state

device

which

does

not

contain

audio

output

transformers,

It

is

therefore

not

necessary

to

match

the

impedance

of

your

speakers

to

the

receiver.

The

SR900

will

per-

form

perfectly

with

any

speaker

which

has

an

impedance

of

4,

8

or

16

ohms.

CONNECTING

THE

SPEAKERS

FOR

STEREO

OPERATION

(2

SYSTEMS)

{.

Connect

all

4

speakers

for

your

two

system

operation

as

shown

in

Diagram

B.

2.

You

may

now

select

either

system

1,

system

1

and

2

or

system

2

by

the

use

of

the

“Speaker

Selector

Switch”

on

the

front

panel.

CONNECT

SPEAKERS

WITH

CARE—AVOID

ACCIDENTAL

SHORTS

\

|

DIAGRAM

B

\

OC

SYSTEM

}

A

H90720649A

NOTE:

WHEN

ALL

THE

SPEAKERS

USED

IN

YOUR

2

SYSTEM

CON.

NECTION

ARE

4

OHMS,

CONNECT

A

2

OHM,

10

WATT

RESISTOR

IN

SERIES

WITH

THE

HOT

SIDE

OF

EACH

OF

THESE

SPEAKERS,

(IF

TWO

OF

THE

SPEAKERS

ARE

4

OHMS

AND

2

OF

THE

SPEAKERS

ARE

ANY

HIGHER

IMPEDANCE

THIS

PRECAUTION

IS

NOT

NECESSARY.)

CONNECTING

THE

SPEAKERS

FOR

MONOPHONIC

OPERATION

(1

SYSTEM)

If

the

SR900

is

to

be

used

monophonically

and

stereo

is

to

be

added

at

a

later

date,

it

is

essential

that

both

speaker

output

terminals

are

terminated

into

a

propcr

load

to

prevent

damage

to

the

output

stage

of

the

receiver.

Refer

to

Dia-

gram

C

for

proper

installation

of

the

loading

resistor.

At

no

time

should

the

output

terminals

be

paralleled

for

monophonic

operation!

THIS

IS

THE

ONLY

CORRECT

METHOD

FOR

CONNECTING

ONE

SPEAKER

TO

THE

SR900

a

CONNECT

SPEAKERS

WITH

CARE—AVOID

ACCIDENTAL

SHORTS

DIAGRAM

C

es

HOO7Z065IA

CONNECTING

THE

SPEAKERS

FOR

MONOPHONIC

OPERATION

(2

SYSTEMS)

If

the

SR900

is

to

be

used

monophonically

and

stereo

is

to

be

added

at

a

later

date,

it

is

essential

that

both

speaker

output

terminals

are

terminated

into

a

proper

load

to

prevent

damage

to

the

output

stage

of

the

receiver.

Refer

to

Dia-

gram

D

for

proper

installation

of

the

loading

resistors.

At

no

time

should

the

output

terminals

be

parelleled

for

monophonic

operation!

THIS

IS

THE

ONLY

CORRECT

METHOD

FOR

CONNECTING

TWO

SPEAKERS

MONOPHONICALLY

TO

THE

SR900

CONNECT

SPEAKERS

WITH

CARE—AVOID

ACCIDENTAL

SHORTS

SYSTEM

|

\

DIAGRAM

D

HS0720652A

CONNECTING

THE

SPEAKER

FOR

STEREOPHONIC

OPERATION

(SYSTEM

1)

AND

MONOPHONIC

OPERATION

(SYSTEM

2)

CONNECT

SPEAKERS

WITH

CARE—AVOID

ACCIDENTAL

SHORTS

\

SYSTEM

2

H9O0S20653A

STEREO

HEADPHONE

RECEPTACLE

The

stereo

headphone

receptacle

located

on

the

front

panel

will

accept

any

headphone

with

any

impedance

rating,

To

activate

the

headphone

receptacle,

the

Speaker

Selector

switch

must

be

in

the

“Phones”

position.

For

speaker

operation,

throw

the

Speaker

Selector

switch

to

cither

the

system

1,

1

and

2

or

2

positions,

depending

on

the

number

of

speakers

connected

in

your

system,

CONNECTING

THE

FM

ANTENNA

Due

to

the

exceptionally

high

sensitivity

of

the

SR900

the

folded

dipole

supplied

with

the

receiver

is

sullicient

for

all

but

the

most

difficult

locations,

‘The

balanced

antenna

input

is

designed

to

accept

a

300

ohm

antenna,

indoor

or

outdoor

type.

When

using

the

antenna

supplied,

spread

the

dipole

so

that

it

forms

a

“I”

shape,

The

stem

of

the

“IT”

ends

in

two

screw

terminal

connections,

and

these

should

be

connected

to

the

300

ohm

and

GND

terminals

on

the

Antenna

Terminal

Strip.

Horizontal

placement

of

the

antenna

offers

maximum

polarization

for

optimum

reception.

The

antenna

may

be

tacked

to

the

back

of

your

hi-fi

cabinet,

to

the

molding

behind

the

equipment

or

to

the

shelf

you

use,

Use

ordinary

tacks

through

the

center

portion

of

the

antenna

leads

to

avoid

shorting

out

the

antenna.

In

more

remote

locations,

an

outside

Yagi,

folded

di-pole

or

omni-directional

antenna

is

recommended

(Jerrold/Taco

FMP

8,

FMP

10,

FMP

16,

CM677).

For

the

greatest

gain,

an

8

to

14

element

Yagi

designed

for

the

FM

band

is

suggested.

A

Yagi,

however,

is

very

directional

and

it

may

be

desirable

to

use

an

antenna

rotor

if

a

full

360°

coverage

is

required.

For

reception

in

the

suburbs,

an

outside

folded

di-pole

or

omni-directional

di-pole

is

recommended.

CONNECTING

A

STEREO

RECORD

PLAYER

—

(MAGNETIC

PICKUP)

Connect

both

leads

from

your

record

player

to

the

CHAN

A

and

CHAN

B

PHONO

LO

input

receptacles

on

the

rear

of

the

SR900

chassis.

If

your

record

player

has

a

special

ground

wire

emerging

with

the

two

input

leads,

conncct

this

ground

wire

to

the

special

GND

terminal

on

the

rear

panel.

CONNECTING

A

STEREO

RECORD

PLAYER

—

(CRYSTAL

OR

CERAMIC

PICKUP)

Connect

both

leads

from

your

record

player

to

the

CHAN

A

and

CHAN

B

PHONO

HI

input

receptacles.

There

is

usually

no

ground

lead

emerging

from

the

record

player

when

a

ccramic

or

crystal

cartridge

is

uscd.

However,

if

your

record

player

does

use

a

ground

lead,

connect

it

to

the

special

GND

terminal

located

on

the

rear

panel.

CONNECTING

A

MONOPHONIC

RECORD

PLAYER

Connect

the

single

lead

from

your

monophonic

record

player

to

either

the

A

or

B

PHONO

LO

input

if

your

player

uscs

a

magnetic

pickup,

or

to

the

A

or

B

PHONO

HI

input

if

it

uses

a

ceramic

or

crystal

pickup.

10

CONNECTING

A

STEREO

TAPE

DECK

A

stcreophonic

tape

deck

has

two

output

leads.

Connect

these

leads

to

the

CHAN

A

and

CHAN

B

TAPE

HEAD

input

receptacles

on

the

rear

of

the

receiver.

Should

you

desire

to

play

back

a

monophonic

tape

on

your

stereophonic

tape

deck,

throw

the

VUNCTION

SWITCH

to

the

TAPE

HEAD

MONO

position.

CONNECTING

A

MONOPHONIC

TAPE

DECK

Connect

the

shielded

lead

from

your

tape

deck

to

the

CHAN

A

‘TAPE

HEAD

input

receptacle

on

the

rear

of

the

rceciver

and

throw

the

FUNCTION

switch

to

the

TAPE

HEAD

MONO

position.

CONNECTING

A

STEREO

TAPE

RECORDER

Since

most

stereo

tape

recorders

include

their

own

record

and

playback

pre-amplificrs,

it

is

not

desirable

to

connect

the

output

of

the

recorder

into

the

TAPE

HEAD

or

any

of

the

other

low

level

input

receptacles.

This

will

result

in

overloading

of

the

low

level

stage

and

cause

distortion.

Connect

the

two

tape

recorder

output

leads

to

the

CHAN

A

and

CHAN

B

AUX

receptacles

on

the

rear

panel

of

the

receiver.

‘This

will

enable

you

to

play

back

your

stereo

tapes.

To

make

a

recording,

connect

the

inputs

of

your

recorder

to

the

CHAN

A

and

CHAN

B

TAPE

OUT

receptacles.

This

will

enable

you

to

make

a

stcreo-

phonic

recording

with

the

proper

recording

cqualization

as

determined

by

your

recorder,

while

simultancously

listening

to

the

program

material

through

your

speaker

system.

The

recording

signals

from

the

TAPE

OUT

receptacles

are

unaffected

by

the

tone

controls

or

volume

setting

of

the

SR900

to

insure

an

abso-

lutely

flat

response.

CONNECTING

A

MONOPHONIC

TAPR

RECORDER

If

a

monophonic

tape

recorder

is

to

be

used

with

the

SR900,

connect

the

recorder

output

to

either

the

CHAN

A

or

CHAN

B

AUX

input

receptacle

located

on

the

rear

pancl.

This

will

enable

you

to

play

back

your

monophonic

tapes.

If

your

recorder

is

sterco

playback

but

records

monophonically,

connect

the

output

as

described

in

the

previous

section

on

connecting

a

sterco

tape

recorder.

Connect

the

input

for

recording

monophonically

as

described

betow.

Connect

the

input

of

your

recorder

to

either

the

CHAN

A

or

CHAN

B

TAPE

OUT

receptacle,

This

will

enable

you

to

record

monophonically

while

simultancously

listening

to

the

program

through

the

recciver

and

speakers.

TO

MONITOR

YOUR

TAPES

WHILE

RECORDING

Connect

the

monitoring

head

of

your

tape

recorder

to

the

TAPE

MON

recep-

tacles

on

the

rear

of

the

recciver

chassis,

Connect

in

accordance

with

the

instruc-

‘tions

supplied

by

the

recorder

manufacturer.

11

Opera

tion

Procedure

kivery

control

on

this

receiver

serves

a

specific

useful

function

and

is

im-

portant

for

the

proper

operation

of

your

sterco

system.

Jt

is

important

to

note

that

under

no

circumstances

should

this

receiver

be

operated

without

either

a

speaker

or

resistive

load

across

both

the

output

terminals,

ON/OFF

SWITCH

The

illuminated

push-button

power

switch

is

located

in

the

lower

left

hand

corner

of

the

receiver.

Depress

the

amber

button

to

turn

the

receiver

on,

Depress

sv

to

turn

the

receiver

off.

When

the

receiver

is

on,

the

push-button

will

glow

softly,

TUNING

CONTROL

‘The

TONING

CONTROL

is

located

directly

to

the

right

of

the

dial

glass

and

is

used

to

select

the

desired

FM

station.

TUNING

METER

_

The

SR900

incorporates

a

D’Arsonval

movement

tuning

meter

for

precise

tuning.

The

TUNING

METER

is

used

to

tune

to

the

center

of

the

station

channel

and

proper

tuning

is

achicved

when

you

are

on

a

station

and

the

TUNING

METER

is

at

maximum.

VOLUME

CONTROL

The

VOLUME

CONTROL

on

the

$R900

is

essentially

two

controls

in

one,

mechanically

tied

together,

to

be

operated

by

onc

knob.

The

volume

control

varies

both

channels

simultaneously

and

is

used

to

adjust

the

volume

level

of

program

material

fed

into

the

sterco

system.

Its

effect

can

be

modificd

by

the

special

Harman-Kardon

CONTOUR

switch.

12

BALANCE

CONTROL

The

nature

of

stereophonic

reproduction

is

such

that

it

requires

two

identical

channels

to

attain

the

highcst

degree

of

faithfulness

and

spatial

distribution.

Any

variation

in

the

cfliciency

of

one

channel

as

compared

to

the

other

will

disturb

this

relationship.

As

there

may

be

slight

differences

between

the

two

speakers,

tape

heads,

cartridge

coils,

ctc.,

the

SR9O0

includes

a

special

control

to

balance

one

channel

against

the

other,

Suflicient

range

is

covered

by

this

contro]

to

permit

rebalancing

of

the

overall

system

even

in

extreme

cases

where

unbalance

exists.

It

should

be

noted

that

the

BALANCE

control

may

be

set

anywhere

within

its

range

of

adjustment

to

attain

system

balance.

BASS

AND

TREBLE

TONE

CONTROLS

The

BASS

and

TREBLE

tone

controls

on

the

SR900

provide

the

full

range

of

tonal

adjustment

necessary

for

stereo

high

fidelity

listening.

The

tone

control

range

is

considerable

and

can

adequately

adjust

the

low

and

high

frequencies

in

accordance

with

your

listening

preference,

speaker

characteristics

and

room

acoustics.

FUNCTION

SELECTOR

SWITCH

The

FUNCTION

SELECTOR

switch

selects

the

desired

type

of

prograin

source,

The

switch

on

the

$R900

has

six

switching

positions,

i.

TAPE

HD

MONO.

This

position

selects

your

tape

deck

for

monophonic

playback,

and

includes

NARTB

equalization,

2.

TAPE

HD

STEREO.

This

position

sclects

your

tape

deck

for

sterco-

phonic

playback

and

also

includes

NARTB

equalization.

3,

PHONO.

This

position

selects

your

record

player

(magnetic,

crystal

.or

ceramic

pickup)

for

playback

and

includes

RIAA

equalization,

4.

FM

MONO/STEREOLOGIC,

This

is

the

normal

listening

position

for

all

monophonic

and

stereophonic

FM

broadcasts.

In

this

position

the

Stereo

{ndicator

Light

and

the

automatic

switching

circuit

built

into

your

receiver

are

operative.

|

5.

FM

STEREO.

This

position

selects

FM

stereo

without

the

automatic

switching

circuit,

|

6.

AUX.

This

position

selects

any

high

level

equipment,

such

as

an

AM

tuner,

the

output

of

your

television

sct

or

any

other

high

level

signal

which

is

connected

to

the

AUX

receptacles

on

the

rear

of

the

receiver.

{3

SPEAKER

SELECTOR

SWITCH

The

Speaker

Selector

Switch

is

a

4

position

switch

which

selects

between

headphone

or

speaker

operation.

It

permits

the

connection

of

2

complete

speaker

systems

(system

1,

system

|

and

2,

or

system

2).

For

additional

information

sce

the

paragraphs

on

speaker

connections.

CONTOUR

SWITCH

One

of

the

limitations

of

human

hearing

is

its

tendency

to

lose

sensitivity

to

the

very

low

pitched

sounds

as

the

program

sound

level

is

reduced.

It

is

this

characteristic

(known

as

the

Fletcher-Munson

cffect)

which

causes

one

to

play

inusic

programs

at

high

listening

levels

in

order

to

experience

the

full

rich

tone

available

from

fine

modern

recordings.

The

Harman-Kardon

CONTOUR

switch

compensates

for

this

effect;

thereby

eliminating

high

listening

levels

as

a

requisite

for

full

enjoyment

of

reproduced

music,

For

warm,

full-bodied

reproduction

at

low

listening

Icvels,

throw

the

CONTOUR

switch

“IN”,

At

high

levels,

the

contour

switch

nas

no

effect.

TAPE

MONTFOR

SWITCH

If

your

tape

recorder

has

a

special

monitoring

head,

throwing

this

switch

to

the

“IN”

position

will

enable

you

to

listen

to

your

tapes

a

second

altcr

they

are

recorded.

When

not

in

use

this

switch

must

be

in

the

“OUT”

position,

LOW

CUT

SWITCH

At

times,

record

changers,

turntables

and

even

some

I'M

stations

produce

an

objectionable

low

frequency

signal

that

is

strong

enough

to

be

introduced

into

the

playback

system.

This

is

knowa

as

rumble

and

can

be

cancelled

out

by

the

cal

low

frequency

cut

off

filter

network

included

in

this

receiver,

Whenever

rumble

is

present

throw

the

LOW

CUT

switch

“IN”.

HIGH

GUT

SWITCH

In

the

event

of

objectionable

high

frequency

scratch,

throw

the

HIGH

CUT

switch

located

on

the

front

panel

“IN.”

‘This

will

roll

off

the

higher

frequencies

and

will

clear

up

the

program

material

considerably,

‘This

switch

may

also

be

used

when

listening

to

FM

reception.

It

may

be

useful

when

listening

to

a

stereophonic

FM

broadcast

which

1s

slightly

noisy,

Throwing

the

FUGH

CUT

switch

“IN”

will

eliminate

the

noise.

14

TONE

CONTROL

SWITCH

This

switch,

when

in

the

“OUT”

position

completely

defeats

the

tone

control

circuit

to

provide

absolutely

flat

response.

When

activated

the

tone

controls

are

“IN”

the

circuit

and

can

be

adjusted

to

your

own

listening

preference.

MUTING

SWEPCH

The

purpose

of

the

muting

circuit

is

to

reduce

audible

noise

when

tuning

from

station

to

station.

Since

very

weak

signals

may

be

muted

at

the

same

time,

the

front

panel

MUTING

switch

may

be

used

to

defeat

the

muting

circuit

on

weak

signals.

To

reduce

interstation

noise,

throw

the

MUTING

‘switch

“ON”,

To

defcat

the

circuit,

throw

the

switch

“OFF”.

STEREO-MONO

SWITCH

The

STEREO-MONO

switch

is

physically

located

as

a

“PUSH-PULL”

function

on

the

“BALANCE”

control.

When

the

switch

is

in

the

“IN”

position

the

reeciver

is

operating

stereo-

phonically.

When

the

switch

is

pulled

to

the

“OUT”

position

the

receiver

is

operating

monophonically,

This

position

may

be

used

when

listening

to

monophonic

records,

or

when

it

is

desired

to

reproduce

a

stereo

program,

such

as

an

FM

stereo

broadcast,

monophonically,

SELECTING

MONOPHONIC

OR

FIM

STEREO

BROADCASTS

Under

normal

use,

the

FUNCTION

selector

switch

should

be

placed

in

the

FM

MONO/STEREOLOGIC

position.

If

the

recciver

is

tuned

to

a

monophonic

FM

broadcast,

the

special

STEREO

LOGIC

circuit

will

automatically

defeat

the

multiplex

circuitry

and

the

tuner

will

reproduce

monophonic

sound

through

both

channels.

Should

this

station

begin

to

transmit

sterco,

the

logic

circuit

will

automatically

switch

in

the

multiplex

section

and

you

will

receive

the

broadcast

in

full

stereophonic

sound.

Should

the

station

conclude

broadcasting

in

sicreo,

your

SR900

recciver

will

automatically

switch

back

to

monophonic

reception.

The

exclusive

Harman-Kardon

logic

circuit

is

always

operative

—--cven

as

you

tune

across

the

FM

dial.

As

you

tune

to

a

stcreophonic

broadcast,

the

logic

circuit

automatically

switches

your

reeciver

to

the

stereophonic

mode

of

operation

-—

and

back

to

monophonic

as

the

sterco

station

is

passed.

15

Should

you

receive

a

weak

stereo

signal

whose

quality

has

been

degraded

by

noise

or

excessive

multipath,

the

special

STEREO

LOGIC

circuit

will

auto-

matically

change

the

mode

of

operation

of

the

recciver

to

monophonic

enabling

it

to

reproduce

an

undistorted

signal.

Should

you

desire

to

listen

to

this

stereo

broad-

cast

in

spite

of

noise

and

degraded

tone

quality,

place

the

function

sclector

switch

in

the

FM

STEREO

position,

‘This

defeats

the

STEREOLOGIC

circuit.

STEREO

INDICATOR

LIGHT

A

sterco

indicator

light

is

located

directly

behind

the

FM

dial

glass

and

operates

in

conjunction

with

the

STEREOLOGIC

circuit.

The

light

visually

indi-

cates

the

reproduction

of

stereo

through

your

receiver.

AUTOMATIC

STEREO

ADJUST

CONTROL

This

control,

located

on

the

rear

panel,

has

been

factory

adjusted

and

should

not

require

further

readjustment.

It

adjusts

the

level

at

which

the

automatic

logic

circuit

will

switch

your

receiver

from

stereophonic

to

monophonic

operation.

If

it

is

necessary

to

re-adjust

this

control

the

following

procedure

should

be

followed.

Tune

to

the

weakest

stereo

station

which

you

desire

to

hear

stereo-

phonically.

Slowly

rotate

the

automatic

stereo

adjust

control

counter-clockwise

to

the

point

at

which

the

sterco

indicator

light

on

the

front

panel

gocs

out.

Then,

slowly

rotate

the

control

clockwise

to

the

point

at

which

the

light

gocs

on,

This

is

the

point

at

which

the

control

should

be

set.

INTERCHANNEL

MUTING

THRESHOLD

ADJUSTMENT

This

control

is

located

on

the

rear

of

the

chassis

and

should

be

adjusted

as

follows:

Tune

in

the

weakest

station

in

your

arca

with

the

front

panel

FM

Muting

switch

in

the

“OFF”

position.

Tune

off

the

station

and

throw

the

FM

Muting

Switch

“ON”,

Rotate

the

“Muting

Adjustment”

clockwise.

Then

rotate

counter-

clockwise

until

only

a

faint

hiss

is

heard.

Tune

in

again

to

the

weak

signal.

If

it

still

can

be

heard,

and

noise

present

off

station

is

negligible,

the

adjustment.

can

be

considered

satisfactory.

NOTE:

Maximum

sensitivity

is

obtained

with

the

FM

Muting

Switch

in

the

“OFF”

position.

16

Special

Sechn

teat

Ynformat

(On

DIAL

SCALE

The

SR900

Dial

Scale

is

marked

with

two

scales,

a

frequency

scale

(88-

108

MC),

and

a

logging

scale

(0-100).

Since

most

FM

stations

operate

on

fre-

quencies

which

are

not

whole

numbers

(such

as

96

MC

as

compared

to

96.3)

ideally

each

megacycle

division

on

the

frequency

scale

should

be

divided

into

10

parts

to

cnable

the

user

to

pinpoint

the

location

of

the

station,

This

wouid

require

a

dial

scale

which

would

be

longer

than

the

front

panel.

The

logging

scale

which

is

divided

into

100

equal

parts

provides

a

means

of

finding

your

favorite

station,

once

you

have

noted

its

position

on

the

logging

scalc.

For

example,

in

New

York

City,

WOXR

operates

on

96.3MC.

After

locating

this

station

through

the

use

of

the

frequency

scale

(between

96

and

98

MC),

you

find

that

the

pointer

falls

on

46

on

the

logging

scale.

Make

a

note

of

this

setting

and

when

you

next

want

to

tunc

to

WOXR,

all

that

is

necessary

is

to

set

the

pointer

to

46

on

the

logging

scale.

EQUALIZATION

In

order

to

achieve

good

reproduction

of

the

wide

range

of

frequencies

in

music

and

to

make

necessary

adjustments

for

the

limitations

of

the

recording

technique,

record

manufacturers

have

found

it

necessary

to

modify

the

actual

frequency

response

of

the

music

while

it

is

being

recorded.

‘Thus,

to

avoid

over-

cutting

and

consequent

distortion,

a

measured

and

deliberate

reduction

is

effected

in

low

frequency

response

by

selecting

a

“turnover

frequency”

and

by

recording

attenuated

response

below

that

point.

To

assure

optimum

signal

to

noise

at

the

high

frequency

end

when

the

record

is

played

at

home,

the

highs

are

dcliberately

exaggcrated

during

the

recording

process.

A

measured

and

deliberate

boost

is

effected

above

a

certain

frequency.

This

combination

of

deliberate

exaggeration

at

the

low

and

high

ends

of

the

frequency

response

can

be

expressed

in

a

recording

curve,

When

the

record

is

played

a

mirror

image

of

that

curve

should

be

available

so

that

the

ideal

“flat”

response

may

be

achieved,

The

TAPE

HD

and

PHONO

positions

of

the

Function

Selector

automatically

select

the

proper

equalization

that

is

required.

\/