Fairchild 610 User manual

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FAIRCHILD

10

WATT

AMPLIFIERS

MODEL

610 -

MONITOR

MODEL

610MI -

Mi

t

or

PHONO

IB

610/1167

INSTRUCTION

MANUAL

.

FAIRCHILD

RECORDING

EQUIPMENT

CORPORATION

,

10

-40 45th Avenue. Long Island City, N.Y. 11101 , 212 784-6163

www.SteamPoweredRadio.Com

FAIRCHILD

MODEL

610

10

WA

TT

AMPLIFIER

G~

The

FAIRCHILD

J1C

:i)

EL

610

amplifier

is

a

fully

siliconized,

10

watt

rms

monitor

amplifier

wit

h

short

circuit

and

ov

erload

p

rot

ec

ti

on

. The ampli

fie

r f

eatures

compact

des

ign

,

low

dis-

tortion,

flat

resp

onse

and

low

noise

.

It

has

bridging

in

put

,

transformerless

outp

ut

and

an

integrated

pow

er

supply

.

The

complete

amplif

i

er

,

less

line

transfo

rmer,

is

on

p

rinted

circuit

card.

In

this

design,

heat

sink

of

~he

outpu

t

stage

is

coupled

to

the

chassis

of

the

amplifier,

effectively

in

-

creasing

heat

radiating

surface.

The

MODEL

610

accommodates

input

l

evels

from

-1

0

dbm

(.25v

bridging)

and

highe

r.

Minimum

level

of

.25V

is

required

to

produce

10

w

at

ts

rms power

into

an

8

ohm

lo

a

d,

or

612

watts

power

into

a

16

ohm

load.

The

amplifier

circuit

consists

of

four

directly

coupled

stages

of

amplification,

phase

i

nv

e

rsion

and

driving.

DC

feedback

loops

stabilize

t he

operating

po

int

o

ver

a wide

range

of

oper-

ating

te

mp

eratures

with

no

degradation

in

performance

of

the

unit.

Instantaneous

overload

protection

is

obtained

through

current-

limitin

g

transis

tors

in

the

driving

circuit

of

each

half

of

the

output

stage.

As

curr

ent

through

either

of

the

output

transis

-

tors

exceeds

preset

value

(clipping

point

f or 10

watts),

output

stage

is

clamped

down d

riving

the

o

utput

stage

into

non-conductive

state

. O

utput

stage

is

C

LASS

AB

circuit

,

with

maximum

cur

rent

fl

owing

thr

ou

gh

the

transistors

be

ing

.4

amps,

and

idling

current

20 ma.

APPLICATIONS

T

he

MODEL

610

amplifier

is

intended

f or

professi

onal

use

in

systems

where

moderate

pow

er

levels

are

adequate

.

It

is

excellent

for

driv-

ing

speakers

wit

h

or

without

transformer

isolation.

70

vo~t

line

c

an

be

achieved

b·· 1i;;ing

appropriate

step

-

up

transformer

with

1

:8

rati

) , J

rimary

b

eing

4

or

8 ohms. The

610

can

be

used

in

cue

circu

its,

talkback

and

intercom

systems

where

high

quality

and

hig

h r

el

iability

are

re

qui

red.

If

t

he

unit

is

used

as

a

line

amplifier,

a

transformer

may

be

used

wit

h

sufficiently

high

power

rating

and

low

distortion

so

that

full

use

of

available

power

can

be

achieved

.

www.SteamPoweredRadio.Com

INSTALLATIO

N &

OPERATION

-

MODEL

610

The

MODEL

610

amplifie

r may

be

rack

mounted.

A

rack

mounting

frame

(MODEL

662RM)

is

available

for

this

purpose.

Five

61

0s

can

be

placed

sidt

-

by

-

side

in

this

frame,

taking

up

51/4

"

of

rack

space

.

If

les

s t

han

five

amplifiers

are

moun

ted

in

the

frame,

either

blank

panels

can

be

used

to

fill

in

or

other

FAI

RCHI

LD

IN'TEGRA

components

can

be m

ounted

in

the

empty

space

.

CA

UTION

, howeve

r,

must

be

exe

r

cised

not

to

mount

equipment

with

mic

transformers

the

amplifiers

. The

inte

g

ra

l p

ower

supp

l y

of

t

he

amp

l

ifier

creates

AC

field

capable

of

inducin

g

60

cycle

hum

int

o

low

leve

l

transformers.

AL

'

TH

OUGH

t he

chassis

of

the

610

amplfier

is

made

out

of

steel

f or

shieldin

g p

urpo

ses,

it

is

recommended

that

the

amplifier

be

chec

ked

o

ut

for

proxim

it

y

interference

before

being

mounted

ne

xt

to

other

amplifiers

.

The

610

w

ill

work

off

any

impedance

no

t e

xc

eeding

10

,

000

oh.ms

,

and

levels

not

lower

than

-lOdbm

(.25V)

.

It

has

capacitive

inp

ut

is

ol

at

i

on.

In

order

t o

ru

n

it

off

a

balanced

line,

an

inp

ut

t r

ansfor

n

er

may

be

in

orde

r.

However,

direct

operation

of

the

610

fr

om

a

balance

d

lin

e

is

:feasible

p

rovided

that

the

amplif

i

er

g

roun

d

is

a

fl

oa

tin

g

ground

and

the

lo

ad

is

not

gr

ounded

(eit

he

r

transforme

r

output

or

speaker)

.

CO'.'<'NECTIC

NS

In

put

to

t

he

a

mp

lifier

is

TERMINALS

1

and

2 -

TER!"iNAL

2

being

ground

.

Output

of

t

he

aoplifier

is

TEM

INALS

3

and

4 -

TERM

IN

AL

4

being

l

ow

s

ide.

Care

should

be

exercis

ed

in

making

appropria

t e g

rounding

to

the

lo

ad

for

if

input

and

output

grounds

are

i

ntercQZlllected

t o

the

same

termina

l

output

,

current

co

ul

d

flow

throu

gh t

he

inp

ut

ground

causing

an

unwanted

fe

ed

bac

k

condition.

SHIELDS

If

shielded

wire

is

used

f

or

t he

input

,

shield

can

be

tied

to

eioher

the

case

gr ou

nd

of

the

rack

asse

m

bly,

or t o

the

low

side

of

the

input

,

prov

id

ing

t

he

ot

her

end

of

the

sh

iel

d

is

not

tied

to

gr ound

and

isfloating

.

Shield

should

be

tied

at

one

end

only,

and

it

may

be

at

the

source

end.

I

nternal

shielding

of

the

amp

lifi

er

is

tied

t o

the

chassis

g

round

internally,

and

is

auto

-

ma

tically

g

rou

nded when t he

unit

is

mounted

on

the

grounded

rack

.

PREC

A

UT

IONS

T

he

~

ODEL

610

amplifier

is

capable

of

taking

abuse

.

However,

some

operating

pr

ecau

tions

should

be

exercised

. As

stated

in

the

specif

i

cat

i

ons,

input

l

ev

el

of -

10

dbm

will

pr

oduce

full

output

into

any

load

.

Since

the

o

ut

0ut

impedance

is

very

lo

w,

varying

lo

a

ds

will

not

change

the

output

level

to

any

appreciable

degree

. S

hor

t

circuiting

o

ut

p

ut

w

ill

produce

instantaneous

turn

o

ff

of

the

output

transistors

.

It

is

v:·.rtually

impo

ss

ibl

e " o

www.SteamPoweredRadio.Com

iamage

the

output

stage

. However,

if

excessi

v

ely

high

levels

are

fed

into

the

input

(i

n e

xc

ess

of

20

dbm

o~

]0

db

highe

r

than

the

specified

-

10)

wit

h

the

input

gain

contr

ol

wide

open

,

power

dissipati

on of

the

inpu

t

stage

w

ill

be

excessi

ve

and

component

damage

may

oc

cu

r .

The power

switc

h

can

be

turned

on

or

off

at

any

t i

me

withou

t

fear

of damage

to

the

circuit

. I f

exce

s

sive

levels

hit

the

power

amplifier

and t he

output

stage

goes

in

t o "

blocked

"

st

a

te

,

tJ

r

ning

the

uni t o

ff

and

on

again

wi

ll

no

t

re

□

ove

the

disa

~

le

condition

.

Protection

of

t he

out

p

ut

stage

will

continue

as

long

as

excessive

power

is

pr

esent

in

the

un

it

. To r emove the

disab

l e

condit

ion,

t

urn

the

input

gain

control

down.

l~en

turn

the

amplifier

off

and

then

on

agai

:·.

and

increase

input

lev

el f

,:,

r

desired

output

.

I f

overload

or

momentary

short

occurs

dur

in

g

operation

of

t

he

amplifier

,

the

protection

circuit

w

ill

automatically

disable

it

-

self

as

soon

as

danger

o

us

transient

has

passed

.

PO',iER

OUT

.i'

UT

OUTPUT

IMPEJJANCE

DAMPIN

G FA

CTOR

INPUT

IMPEDANCE

INPU

T

LEVEL

PO

'

tlER

RZ

~UrnEi'lENT

FRE~UENCY

RESPONSE

THD

DISTORTION

NOISE

Dil'lENSIONS

&

WEIGHT

CONTRO

LS

SPECIFICATI

ONS

MODEL

610

lOW

- 8

ohm

lo

ad

6 .

5W

-

16

ohm

load

.5

ohm

l'lin.

16

l

OK

b

ri

dging

- 10

dbm

for

full

ou

tput

(.25V)

117V

AC

1/4

amp

zl

db

20

to

20KC

L

ess

than

.

4%

at

full

pow

er

any

frequency

. L

ess

t

han

.

2%

at

1

w

att

output

-

86

db

be

low

rated

outpu

t

3

"x

5'V4

"x

l0

"D

- 4

lbs

8 oz

ON/OFF

sw

itch

.

Inp

ut

gain

contro

l

MODEL

610

MI

-mic

or

pho

ne

am

plifi

er

The

MODEL

61

0M

I

diffe

r s

from

the

standard.

MOD

EL

610

in

tha

t

it

has

th

r

ee

added

stages

of

ampli

fication

providing

en

o

ugh

gain

to

drive

the

power

secti

on of

the

circuit

dire

ct

ly

f r

om

mi

crc

-

phone

or

ph

one

cartr

i

dge

.

CONNECTIOHS

-same

as

M

C-

-::I.

6

10

Terminal

1 -

hi

gh

s:de

inp

ut

2 -

low

side

inout

3 -

hi

gh

side

out

p

ut

4 -

lo

w

side

ou

tput

T

he

610~U

normally

comes

strapped

for

m

ic

inp

ut

and

is

prov

i

ded

for

phono

input

on

special

order

.

Ho

weve

r,

i n

orde

r t o

selec

t

proper

eq

ual i

zation

formic

or phono

inpu

t s , remove

th

e

cov

er

rro

m

www.SteamPoweredRadio.Com

the

amplifier

and

se

lect

position

for

the

jumper

on

the

printed

circui

t c

ard

:

Ju

mper

soldered

to

TERKINALS

A

and

B pr

ovides

phono

equal

iz

ation

with

3

mv

sensit

ivity

at

lKhz

for

full

10

watts

of

output

pow

er

Ju

mpe

r

strapped

between

TEffi

iIN

ALS

B

and

C

will

provide

f

lat

response

formic

input

with

sensi

-

tivity

of

-

50

dbm

for

full

10

watts

of

o

utput

power

Sin

ce

gain

cont

r

ol

)f

the

amp

lifi

er

is

b

et

ween t

he

output

of

the

pr

eamplifie

r

section

and

t

he

input

t o

the

power

amplifier

,

CAUTION

should

be

exercised

not

t o

ove

rlo

ad

t he

input

to

the

pr eampl

ifi

er

.

Maximum

l e

vels

are

:

FOR

l'1IC

20

dbm

FOR

PHO

NO

25

dbm

Shield

for

t

he

phono

cable

should

be

tied

to

TERJ-IIN

AL

2,

to

-

gether

w

ith

the

low

side

of

the

cable

.

Double

co

nductor

cable

is

r ecommended t o

be

used

with

the

mic

or

phono

sources.

Mic

cable

can

be

several

feet

long

,

but

if

long

cables

are

antici

-

pated,

in

p

ut

tran

s

former

providin

g

balanced

input

is

rec

omm

ended

.

INPUT

I

i'lPEDANC.E

E~U

ALIZA

T

ION

GA

rn

NO

ISE

&

HUI1

DISTORTION

THD

iJARRAN

TY

SPECIFICATIONS (Preamp}

50K

(

input

w

il

l

acc

e

pt

any

source

re-

qu

iring

loads

50K

or l

ower)

Fl

at

t l db

or

phono

NAB

within

1

db

40

db

80 db

below

full

pow

er

o

uoput

, 5%

or

less

See

standard

wa

r

ranty

policy

. To

va:id

a

te

warranty

,

com

pl e

te

and

return

t

he

w

arranty

regis

tr

at

ion

card

inc

lu

ded

wit

h th

is

manual

.

If

there

is

any

question

on

thi

s

or

any

other

FAiaCHILD

professional

product

,

please

do

not

hesitate

to

contac

t o

ur

CUSTOMER

SERVI

CE

DEPAR

T!

:.ENT

, FAI

RC

HILD

RE

CORDIN

G E

QUi

ii

'.

ENT

CO.al'

O:U

TI

ON, 10

-4

0

45t

h

Av

enue,

Lo

ng

Is

land

City

, N.Y.

111

01

www.SteamPoweredRadio.Com

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Fairchild 610 User manual

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