Fairchild 610 User manual
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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
.
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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
next
t o
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
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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
Rl 2
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R20
1
20
K
r,,:
IOK
2
R
l9
12K
*
R21
1
50
K
06
2N3565
R3
100
RIS
Rl7
4 7K
NOT
ES,
I. AL L CAPACITORS IN M
FD
UNL
ESS
OTHE
RW
ISE
SPECIFI
ED
2 AL L RESISTORS
IN
OH
MS S
1/4
WATT
UNL ESS OTHERWI
SE
SPECIFI
ED
3.•
TO
BE
SELECTED
03
2N
3638
D5
Gl
30
RIO
47
0
01
2N364
3
Rl
6
4 .
7K
2 2K
Rl3
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-
HEA
T SINK
2W
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56
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40
~
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07
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· 16
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6?0
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17.
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Cl
,
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I
/
c~V
610 AMP SCHr_
MA
TIC
1
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3
o4
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96235
www.SteamPoweredRadio.Com
2
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--
-
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..._
_..,_
_,___,
If
R28
220
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R29
100
R30
R31
I
OOK
IOK
CIO CII
.
033
.
0068
R34
680
R32
33
K
2N
3565
09
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u
5/25
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l
_____
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__
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t
JU
M
PER
INT
ER
CO
NNECT'
B-
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IAA
PHONO EQUALIZATION
C - B MIC INPUT,
FL
AT RESPON
SE
R26
3 .
3K
Rl2
• I
.2
K
R
20
I20
K
t,t
•
R2I
06
I50K
IN
3023
06
2N3565
Rl5
3.
3K
R7
220
Rl9
I2K
R3
100
NOTES,
C2
.0
01
R17
4 .
7K
I
ALL
CAPACITORS IN
MFD
. UN
LESS
OTHERWISE SPECI
FIED
2 A
LL
RESIST
ORS
IN OHMS a 1/ 4
WATT
UNLESS
OTHERWISE SPECIFIED
3.lll -
TO
BE
SELECTED
4 . •
♦
-
HEAT
SI
NK
03
2.2K
Rl3
2N3
6
38
RIO
470
01
2N
3643
RI
68
R2
68
R
II
47
0
Rl4
2.2K
Rl6
4.7K
C7
2000
/50V
••
07
40251
2N
3638
0 5
**
610MI
AMP
SC
HEMATIC
C6
+
2000
/2
5V
R25
16
2W
Cl
.22
12
5V
R22
62
0
l/2
W
ISSUE , I
7-
10 - 0
68
2 1
2-26-68
1/ 2
AMP
3
4
B-9647
1
This manual suits for next models
1
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