Fisher 800-b Installation guide

I

ITH

your

purchase

of

a

FISHER

in\trument

you have

com

-

w

pleted

a

chain

of

events

that began

niany

nionths

ago,

in

our

rewnrch

Inhoratories.

For

it is there that

thc

basic concept

of

the

equipment you

have

just

acquired

came

into

being

-

its

appearance.

its

functions,

its

quality

of

performance.

its

convenience

of

use.

But

the end

step

-

your

purchase

-

is

merely

;i

beginning.

A

door

has

now

opened,

for

you

and

your family,

on

virtually unlimited

years

of

musical

enjoyment.

Recognizing

that

one

of

the

keys

to

pleasurable ownership

is

reliability,

we

have

designed

this instru

-

ment

to

give

long

and

trouble

-

free

service.

In

fact, instruments

we

made

over twenty

-

three

years

ago

are

still

in

use

today.

Remember

always

that

we

want

this equipment

to

give

you the

best

performance

of

which

it

is

capable.

Should

you

at any time need

our

assistance

toward

that objective,

please

write me

personally.

AN

IMPORTANT

SUGGESTION

Many

hours

have

been

spent

by

our

engineers

*and

technical

writers

to

create

this

instruction

book

for

your

guidance

and

enjoyment.

If

you

want

the

musr

out

of

your

FISHER, there

is

only

one

way

to

obtain

it.

With the

equipment

before

you,

please

read

this

book

-

let carefully.

It

will

be

time

well spent!

.

Fourider

and

President

1937

1931

1938

1939

1945

1948

1949

1952

1953

First

high

-

fidelity sound systems featuring a

beam

-

power amplifier, inverse feedback, acous-

tic speaker compartments (infinite baffle and

bass reflex) and magnetic cartridges.

First exclusively high fidelity TRF tuner, featur

-

ing broad-tuning

20,000

cycle fidelity.

First two-unit high fidelity system with separate

speaker Prtclosure.

First coaxial speaker system.

First high fidelity tuner with amplified

AVC.

First Dynamic Range Expander,

First 3

-

Way Speaker in a high fidelity system.

First Center-of-Channel Tuning indicator.

First Preamplifier

-

Equalizer with selective pho

-

nograph equalization.

First Dynamic Range Expander with feedback.

First FM

-

AM Tuner with variable

AFC.

First 50-Watt, all

-

triode amplifier.

First self

-

powered Master Audio Control.

First self

-

powered, electronic sharp-cut-off filter

system for high fidelity use.

-

Milestones

In

the

History

of

High

Fidelity

Reproduction

1953

1954

1955

1956

First

Universal Horn

-

Type Speaker Enclosure for

any room location and any speaker.

First FM

-

AM Receiver with a Cascode Front End.

First

low

-

cost

electronic Mixer-Fader.

First moderately

-

priced, professional

FM

Tuner

with TWO meters.

First Peak Power Indicator

in

high fidelity.

First Master

Audio

Control Chassis with five-

position mixing facilities.

First correctly equalized, direct tape

-

head mas

-

ter audio controls and self

-

powered preamplifier.

First

to

use Power Monitor in a home amplifier.

First All-Transistorized Preamplifier

-

Equalizer.

First dual dynamic limiters in an FM tuner for

home use.

First Performance Monitor in

a

high quallty

amplifier for home use.

First FM

-

AM tuner with TWO meters.

1958

1959

7

960

1960

First Stereophonic Radio-Phonograph with

Mag

netic Stereo Cartridge.

First high

-

quality Stereo Remote Control System.

First complete Stereophonic FM

-

AM Receiver

(FM-

AM

tuner, audio control, 40

-

watt amplifier).

First high

-

compliance plus high-efficiency free-

piston speaker system.

First

to

use

MicroRay for

FM

tuning

and as a

Recording Audio Level Indicator.

First complete stereo

FM

-

AM

receiver with

60-

I

watt power amplifier and new

7591

output tubes.

Smithsonian Institution,Washington,

D.C.,

accepts

for

its

collection America’s first commercially

manufactured high fidelity radio-phonograph,

made

by

Avery

Fisher

in

1937.

First reverberation device.

for

use in highfidelity

equipment

-

The Fisher Dynamic Spacexpander.

First stereo tuner with MicroTune.

I

1956

First complete graphic response curve indicator

1960

First FM tuner with six

IF

stages.

1960

First

FM

tuner with five limiters.

1957

First Golden Cascode FM Tuner,

1960

First front panel antenna selector switch,

72

-

300

1957

First

MicroRay Tuning Indicator. ohm, Local-Distant positions.

for bass and treble.

L

THE

FISHER

800-6

ST

E

REOPHO

N

I

C

FAA

-

AM

and

Multiplex

Receiver

I~E

vixy

L

A

T

E

S

T

TECHNIQ[~ES

in

audio

eiigiricering

design have

T

ticen

incorporated

in

the

FISHER

800-23,

resu!llng

in a stereo-

phonic rc-c.c.iver of

truly

outstanding quality which

i,

\

irtually

ob

-

solescence

-

proof.

With the addition of a

pair

of

Ypeakers and

a

record

player,

the

800-B.

with

65

-

watts

of

hlusic.

Power, becomes

the

nucleus

of

a

complete high

-

fidelity spteni

u~iw

I

paised

in

scope

of feature. and

quality

of

performance. The

1300.13

is

capable

of

reproducing both

FhI-.4hl

stereo broadcasts and

tht.

new

FM

multi

-

ples

Ltcreo-icithout

the

need

for

adding

exlerritrl

cidaptors

of

any

kind.

I’hc

F\I

tuning indicator

ran

also be used

as

a Stereo

Beam

indicator.

signalling

instantly

when

the

station tuned

to

broadcasts

n

multiples

ztertto program.

A

special noise

filter

ih

included, which

has

no

vffect

on

the freqnenc.y rangc

of

the

riiiiltii~les

program.

l’h

e

ti

i

g

h

1

:

;en

si

t

1

ve

I:

i\

I

t

11

n

e

r

u

t

il

i

zcs

w

i

de-

t

)a

11

ri

d

t’

C.

1

g

n

t

h

rougho

u

t

tn

ci~-ill~~t

uriparallelr~ti

irredniii

from distortion

nnci

superb per

-

fo:

manw

on

FJi

multiplex

programs.

‘rhv

:\

11

t

iii1t’i

includes

a

tuneci

RF

mi)lifier

for

estra

sensitivity

and eithc.1

broad

or

sharp

handwidth for

maximum

fidrlity

on

local

stations without sacrificing

selectivity and sensititsity when receiving conditions are more

dif-

ficdt. The

blaster

,4udio

Control

of

the

800-8

includes

the:

full

range of functions

found

on

elaborate professional installations,

including such features

as

sharp

cut

-

off

Low

and

High

filters,

Tape!

hlonitor facilities. nnd

a

Phase

Reverse

switch.

The

final

link

in

this chain

of

superbly engineered, integrated audio components

is

the dual

-

channel 65

-

watt power amplifier, capable of driving the

most

inefficient loudspeakers

to

full

room

volume

with

ease.

The

remarkable performance

of

the

800

-

B

is

assured for many

years

to

come

ly

the

craftsmanship arid careful attention to

every

detail

of

manufacture

which

have made

FISHER

quality famous.

We

tire

qure that

your

appreciation

of

the

800-R

will

grow

with

time,

as

it

handles

P1er-y

miisicnl

assigriment

with

that

degree

of

perfection that

only

n

top

-

quality electronic instrument con

provide.

TABLE

OF

CONTENTS

INSTALLING

THE

800

-

6

FOR

THE

‘MAN

IN

A

HURRY’

OPERATING

THE

800

-

B

CUSTOM

MOUNTING

INSTRUCTIONS

TECHNICAL

SPECIFICATIONS

PAGE

3

7

8

13

15

A

NOTE

ON

STEREOPHONIC

SOUND

IEH~.:OI~~IC~~~IC:

SotiRD

is

a

ginnt step forwutd in the history

of

high

S

fidelity

music

reproduction. This unique dual

-

channel system

offers

a distinct

ad\

antage

over

monophonic

(single

-

channel) systems

becaiise

of

two

iniportant audio characteristics:

the

dimensions

of

direction

and

clvp~h.

These

live sound qualities are

for

the most part

missing

in

nionophonic

systems

because recoidings are made and

re

-

produced

over

a

single

channel.

This

is

somewhat analogous to listen

-

ing

to

niusic

with one

ear.

Stereophonic recording techniques,

how

-

ever. utilize two separate banks

of

microphones,

positioned

in

the left

and

right sections

of

the orchestra.

In

this arrangement, the

micro

-

phones detect

the

musical sounds

in

much

the

same

manner

as

the

two

ears

of

a listener.

The

sound picked up by

each

bank

of

micro

-

phones

is

then

ied

to

independent channels and recorded

on

disksor

tape,

or

transmitted

ovCr

scporote channels of

a

stereophonic

broadcast.

To reproduce stereophonic

realism

in the home,

two

separate

sound

channel.;

lire

required

to

achieve

the stereophonic effect.

The

stereo

sound

output

of

n

rer*ord player, tape recorder or tuner

is

fed

to

two

sepnrate

anniiliher

c.hannel\.

which in turn drive two separate speaker

q-stems-.

‘I‘Iiu+.

instruments

lorated

on

the left

side

of

the

orchestra

are

hcarti

[It

cdominaritly

in

the speaker

to

your

left: instruments

on

the right

side

of

the

orchestra are heard predominantly in

the

speaker

to

pour right:

Jvhile

instruments

located

in

the

center

appear to

be

heard midway between the two speaker systems. The

result

is

a

star

-

tling

sense

of

presence

such

as

is

normally experienced

only

at a live

orchestral performance.

FM

MULTlPLEX

STEREO

M

BROADCASTING

has

a

frequency range

far

in

excess

of

the

normal

F

henring range.

For

esampIe, Fisher wide

-

band tuners have

B

frequency

range

which

extends

to

75

kc,

while the

normal

hearing

range

does

not

exceed

17

kc.

This extra “space”

in

the

frequency

m

0

u

f

Y

c

UJ

Iy

3

2

LL

m

-5

8

c

3

ares.

It

has

txrn

found

that

the

aural

CfTt‘vt

of

stereophonic sound

i-

enhanced

I+

11~11

two

itlrntic~sl

speakcr

ti’nis

are

used. Although

111e5e

pi

incipivs

can

wrw

as

a

geiirral

still

t

ing point in placing

you1

loridyeakei,i.

wfi

+trongIy re(mniiiiei1d

that

yoit

experiment with

set

era1 cliffercnt arriinpt~nrentstwfore

dccidit~g

on

n

final placement.

l’lic

iiripredirtable

effects

rcsuiting from

1\11

niture arrangement and

irregularities

in

room

dimensions may

In:iLrs

ii~iorthodoxplacement of

t

11c

1

o

u

d

s

pea

k

e

I‘S

11

e

c

ssa

ry

.

After the

initinl

loc.atiuii

of

the

loud*pr~,ihershas been decided

upon, make the

followiiig

connections:

ONE

SPEAKER:

If

you

are

rising

only

oiic

speaker teniporarily,

connwt it

to

the

LEFT

SPKR

terminal

ltrp

(one on each speaker

terminal

strip

with

ordinary

power

cold

or

heavy

-

duty

TV

antenna

twinlead. Surh cables may be up

to

50

feet in length. Then con

-

nect an

8-

to

10-ohm resistor

rated

at

a

iiiiiiimum

of

10

watts to

the

CKD

and

“3”

lugs on the Right SptAaker terminal

lug.

The

4

short wire

proti

iicling

from the chassis

4iuuld

lie connected to

the

“4”,

“8”,

or

”16”

lug

on

the

Left

Speaker

Impedance Selector

t

terminal strip. depending

on

the

impcrlntice

of

your loudspeaker,

TWO

SPEAKERS:

Connec,t the

speaker

011

your left (as viewed from

the listening

area)

to

the terrniiial

lug+

iu‘irkcd

LEFT

SPKR

(one

on each speaker terminal strip), Detertiiiiie the impedance

of

your

speaker

and

ronnert

the

short

wire

pt‘otr

uding

from the

chassis

to

tlie corresponding terminal

lug

oti

thc

hit

Speaker Impedance

Selector terminal

strip.

The

speaker

on

your

right

should

be

connected

to the Right Speaker terminal strip, t~ctweenthe

GND

lug and the

“S”,

“8”,

or

“16”

lug,

depending

on

the impedance

of

the speaker.

Ordinary power cord

or

heavy

-

duty

TV

antenna twinlead up to

50

feet in length may be used for these connections.

Antennas

‘The

800-8

is supplied with

a

hilt

-

in ferrite loop antenna for

AM

reception. ‘This antcnno provides

supcrior

rcjcction

of

noise and static

and

should

prove morc than adeqiiate

for

all but extreme long-

distaiicv applications.

Thc3

antenna

shoi1ld

be

moved to the rear

and

downward

for

best reception.

Tlie

foi

ward

position

is

used

for

sliip1)in~

only.

Sincc this

type

of

antenna

is

somewhat directional,

the

800-B

chassis

should

be rotated to deterrninr the orientation

wiiirh

proVide+

the

[Jest reception.

For

long

-

distance reception, a

long

wirt.

antenna

(‘an

be

added to the

800

-

B

by removing the strap

acros

the

AhI

:Intenria terminals

on

the

rent

panel and connecting

the long wire

to

the left terminal.

A

folded dipole

FM

antenna

is

included with the

800-B.

The

two

arms

of

this antenna should be horizontal and away from all large

metal

objects

and

electrical wiring for best results.

If

the

800-B

is used in close prosimity

to

one or more powerful

Fhl

stations, the

two wires

from

this antenna should

be

connected to

the

LOC

ter

-

minals

on

the

FM

AntenIw terminal strip on the rear panel.

This

will

prevent such stations from overloading the sensitive input

stages

of

the

800-B

FM

tuner.

If

an

Fhl

station is not located

nearby, the

DIST

terminals should be used. After the antenna has

been connected

and

the

800-€3

put in operation,

the

antenna

should

be rotated horizontally,

to

determine the orientation

for

best

recep

-

tion.

In

apartment Iiuildings and other Luildings using steel struc

-

tural

supports. reception

can

be

improved

by

placing the antenna

close to

n

window.

If

tacks

or

staples are used to fasten the

antenna

in

p1ac.e. be sure that they do not contact

the

two con

-

ductors running along each edge of the antenna wire and avoid

fastening the antenna directly to

a

wall.

If

necessary. the antenna

may he placed under

a

carpet,

but

as

a

general rule, reception

improves as tlie height

of

the antenna

is

increased. The antenna

should never be folded

or

coiled,

FM

multiples requires stronger signals

for

low

noise

levels than

ordinary monophonic programs. You may find, therefore,

that

place-

*merit

of

the antenna may

have

to be improved

for

good multiplex

reception.

In

some cases, especially in fringe areas, an outdoor

rooftop antenna or even

a

highly directional

yngi

type may

be

ileeded

for

multiples

rereption, even

though

the.

iiidoor antenna

suffices

for

movoptioiiic transmisions. Outdoor antcnnas

should

he

connertrd to

the

DIST

tcrniinals.

Record

Players

and

Changers

hlngiietic

or

ceramic phonograph cartridges

call

IJC

played

through

the

800-R.

The

PHONO

input

jack5

are.

us;rd

for

a

magnetic

cartriclce

anrl

the

PILX

inputs

ore

used

for

;i

cc~rninicrcirtridge.

If

you

ciiiitiot

ascertaiii

whi,*li

of

the two

leads

from

the'

record player

is

the

(,hanncl

A

output

and

which

is

~lic

Chaiinr*l

I?

output, connect

tliern

LO

the

1300-8

nnd

li?tprl

for

normal

plncvtnc‘lit

of

the instru

-

ments

011

a

symphonic stereo

record.

If

the

violiii

.set-tion appears

to

be

lorated

on

the

right,

reverse the

leads

from

thcb

phonograph.

The

(:Iiaiiiiel

Reverse

%witc*h

niny

bc

used

to

c*hcc*k

this

listening

test.

’I‘hc~

instruments

GIinultl

l)e

properly plarcd

\r

1th

the Channel

Revers.

switch

in

the

OFF

position.

(Spwial

te.1

rwnrds

may also

be

o1,tainerl

from

yoilr

rword

dealer.)

tapes while the);

are

being recorded, and

to

have the

full

use

of

all

the

audio control facilities

of

the

800-B

during ordinary playback

of previously recorded tapes. Connections ore as

follows:

STEREOPHONIC

TAPE RECORDER:

1

-

Connect the Channel

A

output

of

the tape recorder

to

the

A

TAPE

hION

jack

on

the rear panel.

2

-

Connect the Channel

B

output

of

the tape recorder to

the

R

TAPE

MON

jack on the rear panel.

3

-

Connect the Cliuririel

A

input

of

the

tape

recorder

to

the

A

RCRDR

OUT

jack.

4

-

Connect

the

Channel

B

input

of

the tape recorder

to

the

H

KCRDR

OUT

jack.

MONOPHONIC TAPE RECORDER:

1-Connecl tlw

output

of

the tape recorder to the Channel

A

5

TAI’E

hION

jack on the rear panel

of

the

800-B.

2-(:onnec*t the

iriput

of

the

tape recorder to the

A

RCRDR OUT

jii(*k

on

the

rear

panel.

NOTE:

During

iilii)

1)ac.k

of

your tapes, place the Mono

-

Stereo

$witch

in

the

RIONO

position

for

sound from hoth speaker systems.

To

monitor

tapes

through both speakers

as

the tapes are being

I-ccordcd

(on

recorders

with

separate

record and playback heads

(Jnl)’),

the

oiit~tiit

of

the

recorder niwt

lie

conncctcd

to

both

T.4PE

hlON

input jacks. This can

easily

be

done

by

obtaining

a

“Y“

con

-

nector

or

IJY

splicing together two shielded cables.

Tape

Decks

A

tape

deck

i-

thv

1:ipe

transport mechanism without the electronic

preamplificrs found

in

tape

recorders.

Such tap

det

k~

may

he

played

output

through

the

800-8

by

connecting the Channel

A

(or

Left

nil

the

tape derk

to

the

jack

on the

NWR

111i1rkedChannel

A

TAPE

HEAD.

’I’hc

Channel

H

(or

Kight)

OIII~I~IL

from

the

tape

deck

should

be

cwnriected

to

the

CIianneI

13

‘l‘;\f’K

HEAD

jack.

A

mono

-

phonic, tape

deck

should

be

connectecl

IO

[hc

Channel

A

TAPE

FI

E

AD

jack.

Spacexpander

The

FISI-IER

St-’u(‘‘.t/-’ciri(ler.

hIodel

K-

10,

YUII

he

connected

to

the

800-B

hy

u$ing

the

ppecial

Spacc~xpcznder

jn(7ks

on

the rear

panel.

Before

in.tiilli;lp

the

.?’pcicc.z.pnniler.

remn\

t.

111(~

LWO

jumper wires

be

-

tween

the

Spnce.ipnnder

jacks hut

retail1

tile

jumpers for

possible

future

uhe.

These

jiinipcrs

must

he

iiisertcd

when

the

Spncexpurider

is

not

conriected

or

the

800-B

will

hr

coriiplctclp

inoperative.

Make

the following connections to the

,Space~purtt/er:

l--Chatinel

A

TO

RE\’ERB

OUT

javk

oii

llie

800

-

B

to

the Chan

-

nel

A

0U’I‘PIJ”T‘

jack

on

tlw

Sptrcesparicier..

2-Cliannel

D

‘1’0

REJ’ERR

OU‘I’

jark

(311

tho

800-B

to the Channel

R

OU‘TPU‘I’

jack

on

tlic

Spac~cxpiirrrlcr.

3--C:hanncl

A

‘I’O

KE\’ERB

IN

jnt\k

on

thr

MI-B

to the Chnnnel

A

1

NPUl

jack

on

the

,Spnce,xpunder.

6

I

4-Channel

B

TO

REVERB

IN

jark

011

the

800-B

to the

Channel

B

INPUT

jack on

the

Spuceipander.

Center

Channel

A

center

channel

speaker

nnd

sel,uratr

power

tlmplifier may

be

added

to

\he sound system

of

your

8017-H

115’

connecting the addi

-

tional

amplifier

to the

CENTER

CH

OU‘I‘I’UT

jock

on

the

rear

panel.

Srich

an amplifier

should

have

n

i.olume

or

input

level

control,

but

tone

controls

are

not

necessary sirice these

are

provided

by

the 800-B.

After

an

initial

adjustment

of

thc center channel

volume on

the

additional power amplifier,

the

Volume

control

on

the

front

panel

of

the

800-B

can

be

used

to

vav

the

volume

level

of

all

three speak?‘ systems simultaneously.

If

the

left

and

right

spders must

he

placed far apart in your listening

room,

resulting

in an apparent “hole

-

in

-

the

-

middle” of the

stereophonic

sound

pat

-

tern,

a

renter channel speaker

will

be

found

particularly effective

in restoring

a

naturally

balanced

curtain

of

sound.

System

Grounding

The screw t~rrmiiialmarked

GND

on the upper

(Left

Speaker)

terminal

niiiy

he

risetl

to

ground

the motor and tone arm

of

your

rerortl player

in

order

10

reduce

hum.

The

ciinssis

ground

of other

components ma:<

also

lie

connected to

this

terminal

if

desired.

Speaker

Phasing

‘4ftt.r having

read

the wction

on

operation

of

the

8UU-B,

perform

the following

siic.aker

phasing

adjustment:

1

-

Play

i\

rnor~ophonic~

rcc

orti

with prominent

bass

material.

2-Slitlr

the

I’haw

Rc\c*rw

Switch

to

ON

and then to

OFF,

and

ronil)arc.

tliv

5oiiiicl

of

thr

l)a+.;

ton^+

under each condition. You

may

fiiltl

it

h(~1p~ttI

to

tiirn

the

Bass

controls

clockwise

and

the

1

retjic

cotitrot+

(

criiriIrrc,loc.krvise

during

thk test.

r.

%-If

thr

IMC.;

wiii~il~

fr~llrr

arid richer

with

the

Phase Reverse switch

ON,

tirrri

ofi

thrs

power LO

the

800-B

and reverse

the

leads to

the

left

speaker.

’l’hen

place the

Phase

Reverse

switch in the

OFF

positio

11.

&If

the

has.; sor~nd

is

fuller

with

the Phase Reverse switch

OFF,

your

speakers are

ulrwrly

in phase

and

no

further

adjustments

are

newsirg.

Ketiirn

the Phase

Reverse

switch

to

the

OFF

position.

5

-

If

yoti

are

using

a Center Channel speaker, perform

the

same

listening test while

rcver4ng

the center speaker leads.

The

Phase

Reverse switch has no effect

on

the

center

speaker.

A

SHORT

OPERATING

GUIDE

FOR

THE'MAN

IN

A

HURRY'

1

I

STEP

2

I

~

source you

wish

to hear.

Set

SELECTOR

switch to the program

PHONO

to listen

to

a

record.

MPX

STEREO

to

listen to

a

multiplex

FM

program.

FM

for monophonic

FM

programs.

FM

-

AM

STEREO

for

FM

-

AM

stereo

prosrams.

AM

for monophonic

AM,

TAPE

to listen

to

a

tape recorder,

I

P

r

STEP

3

STEP

1

Turn

on

power

by

turn

-

:.

-

\ffiIfrAAC

,,,A,,l

Set

MONO

-

STEREO

switch to

I~AL~A

r

I.

I

-l:-L+i.*

-I--L..,:ee

..-+:I

:+

1119

~WLUIIIC

LUllllUl

I

MVNU

tor monopnonic pro-

I

nrmmc

I I

3llullll~

LlULKWI>G

Ulllll

II

I

y'UII1.l.

I

STEREO

for

stereo programs.

I

UI

clicks. Adjust

later

for

desired volume.

I

NOTE:

Set

all

other switches and controls in the position shown.

7

0

'I'his adju.;trnent will assure that

thr

qlt5;ikers in your system

"push" and

''pull

"

in

unison, instead of

in

upposition

-

an important

consideration in achieving the maximtiin

stcreo

eflrct

and

good

low

frequency sound.

OPERATING

OI'R

80O-B

is

now

ready for opcration,

hut

like any other fine

Y

piere

of

electronic equipment.

it

niust

IN:

operated correctly in

order to deliLer its

full

capabilities.

Q'e

iirge

you to read these

instructions carefully

in

order

to

uchiet-ci optitiium results.

Volume

Conirol

The:

j'olume control regulates the total volume

of

sound from

the speakers.

The

AC

Power switch

is

combined

with this control,

and the

power

is

turned

off

at the estic~meleft position.

This

switch also controls the

two

power

outlets

on

the rear panel.

The

l'olurne control ctianges the sound

I~vel

from

both channels simul

-

taneously.

thus

making it unnecessary

to

tinlance the channels each

time

you change the volume.

Loudness

Contour

Switch

The

Loudness

Contour switch

is

~ist*(I

10

add compensation for

the natural deficiency of

the

humaii

eat

in

the extreme

bass

and

trehle ranges at low volumcs. With

thiq

cwitch

in

the

ON

position,

an increacing enipha3ir;

of

low

Imss

and

high

trehle tones

is

added

;is

the

\'oltinic

control

is

turned couiiturr,luck,vise,

resulting

in

a

more natural sound at

low

volume levels,

Selector Switch

?'he

nine positions

of

the Selector

switch

perform the following

functions

:

TAPE

HEAD:

Selects

a

tape

deck

connected

to

the

TAPE

HEAD

jacks and provides rorrect equalization for tapes played

at

a

speed

of

33;

and

7!5

inches per second.

PHONO:

Selects a record player

connected

to

the

PHONO

jacks

and

provides correct equalization

(RIAA

)

for all records made since

1954.

MPX

FILTER:

Used for listening to

FhI

multiplex programs

from

weak stations. The fiIter will climinate muth

of

the

noise

without

restricting

the

liequency

range

of

the music

signal.

The

Stereo

Beam tuning eye

will

automatically indicate when

a

multiplex

program is broadcast.

MPX

STEREO:

This position

is

used

for

Iistening

to

multiplex

Lroad-

casts from stronger stations.

The

Stereo Beam

also

operates

witb

the

Selector in this position.

FM:

This position

is

used

'for

listening to monophonic

FM

broadcasts

and for tuning in

an

Fhl

station.

FM

-

AM

STEREO:

This

is

the position for listening

to

Fh.1-AM

stereo

programs. The

FM

station will be heard

on

the left

speaker

and

the

Ah1

station will

be

heard on the right.

AM:

hlonophonic

,4M

programs

may

be heard

by

turning the

Selector

to

this position.

AUX:

This

position

selects

a

component connected

to

the

AUX

jacks

on

tht'

iear panel.

TAPE:

Selects

a

tape recorder for playback

of

previously recorded

tapes.

This

position

is

not

used while making

a

recording.

Balance

Control

This

control

is

used to equalize

the

sound levels

from

both

speaker

systems to achieve the optimum stereo

effect.

If

the

Channel

A

and

Channel

R

inputs are exactly balanced,

you

will hear equaI

sound

levels from the left and right speakers with the control in

the

Fisher 800-B Installation guide

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