Adcom GCA-510 User manual
yfXXM
details
you
can
hear
GCA-^O
Control
Amplifier
OWNER’S
MANUAL
THE
FOLLOWING
PRECAUTIONS
AND
SAFETY
INSTRUCTIONS
ARE
REQUIREMENTS
OF
UL
AND
CSA
SAFETY
REGULATIONS
Warning:
To
reduce
the
risk
of
fire
or
electric
shock,
do
not
expose
this
unit
to
rain
or
moisture.
m
CAUTION
i
i
RISK
OF
ELECTRIC
SHOCK
DO
NOT
OPEN
AVIS:
RISQUE
DE
CHOC
ELECTRIQUE-NE
PAS
OUVRIR.
The
graphic
symbol
of
a
lightning
flash
with
an
arrow
point
within
a
triangle
signifies
that
there
is
dangerous
voltage
within
the
unit
and
it
poses
a
hazard
to
anyone
removing
the
cover
to
gain
access
to
the
interior
of
the
unit.
Only
qualified
service
personnel
should
make
any
such
attempt.
The
graphic
symbol
of
an
exclamation
point
within
an
equilateral
triangle
warns
a
user
of
the
device
that
it
is
necessary
to
refer
to
the
instruction
manual
and
its
warnings
for
proper
operation
of
the
unit.
Do
not
place
this
unit
on
an
unstable
cart,
stand,
tripod,
bracket,
or
table.
The
unit
may
fall,
causing
serious
njury
to
a
child
or
adult,
and
serious
damage
to
the
unit.
Use
only
with
a
cart,
stand,
tripod,
bracket,
or
table
recommended
by
the
manufacturer,
or
sold
with
the
unit.
Any
mounting
of
the
device
should
follow
the
man¬
ufacturer's
instructions,
and
snould
use
a
mounting
ac¬
cessory
recommended
by
the
manufacturer.
Read
all
the
safety
and
operating
instructions
before
connecting
or
using
this
unit.
Retain
this
notice
and
the
owner’s
manual
for
future
reference
All
warnings
on
the
unit
and
in
its
operating
instructions
should
be
adhered
to.
All
operating
and
use
instructions
should
be
followed.
Do
not
use
this
unit
near
water;
for
example,
near
a
bathtub,
washbowl,
kitchen
sink,
laundry
tub,
in
a
wet
basement,
or
near
a
swimming
pool.
The
unit
should
be
installed
so
that
its
location
or
position
does
not
interfere
with
its
proper
ventilation.
For
example,
it
should
not
be
situated
on
a
bed,
sofa,
rug,
or
similar
surface
that
may
block
the
ventilation
openings;
or
placed
in
a
built-in
Installation,
such
as
bookcase
or
cabinet,
that
may
impede
the
flow
of
air
through
its
ventilation
openings.
The
unit
should
be
situated
away
from
heat
sources
such
as
radiators,
heat
registers,
stoves,
or
other
devices
(including
amplifiers)
that
produce
heat.
The
unit
should
be
connected
to
a
power-supply
outlet
only
of
the
voltage
and
frequency
marked
on
its
rear
panel.
The
power-supply
cord
should
be
routed
so
that
it
is
not
likely
to
be
walked
on
or
pinched,
especially
near
the
plug,
convenience
receptacles,
or
where
the
cord
exits
from
the
unit.
Clean
unit
only
as
recommended
in
its
instruction
manual.
The
power-supply
cord
of
the
unit
should
be
unplugged
from
the
wall
outlet
when
it
is
to
be
unused
for
a
long
period
of
time.
Care
should
be
taken
so
that
objects
do
not
fall,
and
liquids
are
not
spilled,
into
the
enclosure
through
any
openings,
This
unit
should
be
serviced
by
qualified
service
personnel
when;
A.
The
power
cord
or
the
plug
has
been
damaged;
or
B.
Objects
have
fallen,
or
liquid
has
been
spilled,
into
the
unit;
or
C.
The
unit
has
been
exposed
to
rain,
or
liquids
of
any
kind;
or
D.
The
unit
does
not
appear
to
operate
normally,
or
exhibits
a
marked
change
in
performance;
or
E.
The
device
has
been
dropped,
or
the
enclosure
damaged.
DO
NOT
ATTEMPT
SERVICING
OF
THIS
UNIT
YOURSELF.
REFER
SERVICING
TO
QUALIFIED
SERVICE
PERSONNEL.
ATTENTION
POUR
PREVENIR
LES
CHOCS
ELECTRIQUES
NE
PAS
UTILISER
CETTE
FICHE
POLARISEE
AVEC
UN
PROLONGATEUR,
UNE
PRISE
DE
COURANT
OU
UNE
AUTRE
SORTIE
DE
COURANT,
SAUF
SI
LES
LAMES
PEUVENT
ETRE
INS^REES
A
FOND
SANS
EN
LAISSER
AU-
CUNE
PARTIE
A
D^COUVERT.
CAUTION
TO
PREVENT
ELECTRIC
SHOCK
DO
NOT
USE
THIS
POLARIZED
PLUG
WITH
AN
EXTENSION
CORD,
RECEPTACLE
OR
OTHER
OUTLET
UN¬
LESS
THE
BLADES
CAN
BE
FULLY
INSERTED
TO
PREVENT
BLADE
EXPOSURE.
CAUTION
“
POWER
LINES
Any
outdoor
antenna
must
be
located
away
from
all
power
lines.
OUTDOOR
ANTENNA
GROUNDING
If
an
outside
antenna
is
connected
to
your
tuner
or
tuner-preamplifier,
be
sure
the
antenna
system
is
grounded
so
as
to
provide
some
protection
against
voltage
surges
and
built-up
static
charges.
Section
810
of
the
National
Electrical
Code,
ANSI/NFPA
No.
70-1984,
provides
information
with
respect
to
proper
grounding
of
the
mast
and
supporting
structure,
grounding
of
the
lead-in
wire
to
an
antenna
discharge
unit,
size
of
grounding
conductors,
location
of
antenna
discharge
unit,
connection
to
grounding
electrodes,
and
requirements
for
the
grounding
electrode.
a.
Use
No.10
AWG
(5.3
mm")
copper,
No.8
AWG
(8.4
mm")
aluminum,
No.17
AWG
(1.0
mm")
copper-clad
steel
or
bronze
wire,
or
larger,
as
a
ground
wire.
b.
Secure
antenna
lead-in
and
ground
wires
to
house
with
stand-off
insulators
spaced
from
4-6
feet
(1.22-1.83
m)
apart.
c.
Mount
antenna
discharge
unit
as
close
as
possible
to
where
lead-in
enters
house.
d.
Use
jumper
wire
not
smaller
than
No.6
AWG
(13.3
mm")
copper,
or
the
equivalent,
when
a
separate
antenna-grounding
electrode
is
used.
See
NEC
Section
810-21
(J),
EXAMPLE
OF
ANTENNA
GROUMDING
AS
PER
NATIONAL
ELECTRICAL
CODE
INSTRUCTIONS
CONTAINED
IN
ARTICLE
810
-
RADIO
AND
TELEVISION
EQUIPMENT.
NOTE
TO
CATV
SYSTEM
INSTALLER
This
reminder
is
provided
to
call
the
CATV
system
installer's
attention
to
Article
820-22
of
the
National
Electrical
Code
that
provides
guidelines
for
proper
grounding
and,
in
particular,
specifies
that
the
cable
ground
shall
be
connected
to
the
grounding
system
of
the
building,
as
close
to
the
point
of
cable
entry
as
practical.
INTRODUCTION
Congratulations
on
purchasing
ADCOM's
GCA“510
Controi
Amplifier.
We
designed
this
unique
product
for
both
simpie
operation
and
exceptionai
sound
quaiity.
We
don’t
anticipate
any
difficulty
in
setting
up
the
GCA-510,
but
ask
that
you
do
read
the
following
instructions
carefuiiy
before
you
begin
hooking
up
your
new
component.
CIRCUIT
DESIGN
CONSIDERATIONS
The
GCA-510
is
an
innovative
example
of
the
minimalist
school
of
circuit
design.
Aithough
it
offers
the
convenience
of
an
"integrated
amplifier,”
it
is
actually
a
very
high
gain
power
amplifier
preceded
by
a
passive
levei
controlier.
There
is
no
separate
preampiifier
stage
in
the
GCA-510
at
all.
The
circuit
topoiogy
includes
a
two
stage
discrete
front
end
with
doubly
regulated
and
temperature
compensated
active
constant
current
bias
sources.
This
gives
exceptionally
stable
performance
characteristics
from
DC
to
ultrasonic
frequencies.
The
output
stage
utilizes
a
unique
Bias-Emitter
Multiplier
to
amplify
a
transistor's
inherent
silicon
junction
voltage
to
create
a
temperature
compensated
constant
voltage
source.
The
complementary
output
stage
features
discrete
high
power
devices
operated
in
a
high-bias
Class
AB
Common
Collector
mode.
This
design
employs
no
current
limiting.
Consequently,
the
amplifier
is
completely
capable
of
driving
low
Impedance
loads
without
excessive
distortion.
The
amplifier
is
also
virtually
impervious
to
speaker/cable
reactance
and
will
drive
a
fully
phase
shifted
load
with
the
same
distortion
performance
exhibited
with
a
purely
resistive
load.
Precise
loudspeaker
control
is
further
assured
by
the
intentional
elimination
of
output
coils
to
provide
a
constant
high
damping
factor
over
the
entire
audio
range.
1
FRONT
and
REAR
PANELS
We
carefully
designed
the
GCA-510
with
your
enjoyment
in
mind.
Controls
are
at
a
minimum
and
we’ve
arranged
them
so
that
their
use
is
truly
intuitive.
The
rear
panel
benefits
from
the
same
design
goals.
Take
a
moment
to
familiarize
yourself
with
the
following
drawings,
You1l
find
references
to
the
circled
numbers
throughout
the
rest
of
this
manual.
GCA
510
-
FRONT
PANEL
DIAGRAM
O
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<r>
O)
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-
510
REAR
PANEL
DIAGRAM
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3
HOOK
UP
AND
OPERATING
INSTRUCTIONS
1)
Unpack
the
GCA-510
carefully.
Put
the
foam
cocoon
and
other
packing
materials
back
in
the
carton
and
SAVE
IT.
As
part
of
ADCOM’s
quality
control
procedures,
your
GCA-510
was
carefully
inspected
for
physical
imperfections
and
electrical
performance
before
it
left
our
plant.
In
the
event
of
physical
damage,
notify
your
ACCOM
dealer
immediately
and
request
help
in
filing
a
written
damage
claim.
THE
RIGHT
TO
A
CLAIWl
AGAINST
A
COMMON
CARRIER
CAN
BE
FORFEITED
IF
THE
CARRIER
IS
NOT
NOTIFIED
PROMPTLY
IN
WRITING
AND
IF
THE
SHIPPING
CARTON
AND
PACKING
MATERIALS
ARE
NOT
AVAILABLE
FOR
INSPECTION.
SAVE
ALL
PACKING
MATERIALS
UNTIL
THE
CLAIM
HAS
BEEN
SETTLED.
The
foam
cocoon
and
carton
were
specifically
designed
to
protect
your
GCA-510.
Even
though
space
is
often
at
a
premium
in
today's
homes,
we
recommend
that
you
save
the
packing
materials
in
case
you
need
to
ship
the
unit
anywhere
in
the
future.
2
)
Select
a
stable,
vibration-free
location
for
the
GCA-510
as
close
as
possible
to
your
other
audio
components.
Make
sure
you
have
enough
air
space
for
proper
ventilation.
We
recommend
at
least
3"
of
free
air
space
above
the
GCA-510
and
an
inch
to
each
side
and
to
the
rear
of
the
unit.
The
QCA-510
is
heavier
than
you
might
expect
due
to
the
high
capacity
toroidal
transformer
and
large
heat
sink
assembly.
A
stable
supporting
surface
is
necessary.
We
won't
go
into
the
endless
and
mostly
unproved
theories
about
extraneous
vibrations
and
their
deleterious
effects
on
audio
components
except
to
say
that
the
more
massive
and
firmly
anchored
the
supporting
surface
is,
the
less
likely
you'll
be
to
experience
any
problems.
Proper
airflow
is
important.
Don't
block
the
ventilation
slots
on
the
bottom
plate
and
top
cover
of
the
unit.
The
feet
will
insure
enough
air
space
below
the
GCA-510
tor
adequate
circulation.
WE
RECOMMEND
THAT
YOU
DO
NOT
STACK
OTHER
UNITS
ON
TOP
OF
THE
GCA-510.
3)
Turn
off
all
the
other
components
in
your
system.
That
means
everything.
And
don't
plug
the
GCA-510
into
the
AC
outlet
yet.
Turning
off
system
components
before
initial
installatbn
and
connection
avoids
the
nasty
buzzes,
thumps,
and
other
sounds
of
electronic
distress
that
occasionally
accompanies
hooking
up
components.
4)
Connect
the
speakers
to
the
5-way
binding
posts
(speaker
outputs)
of
the
GCA-510©&
O
■
The
binding
posts
will
accept
a
variety
of
connectors
from
bare
wire
to
exotic
audbphile
“super
banana”
types.
Make
sure
to
obseive
proper
polarity:
Connect
the
GCA-510’s
“+"
(red)
terminal
for
the
left
speaker
to
the''+”
terminal
on
that
speaker.
Do
the
same
for
the
terminals.
Then
repeat
this
for
the
right
speaker.
Exercise
care
in
connecting
your
speakers.
Be
particularly
alert
that
individual
strands
of
speaker
wire
do
not
short
between
the
“+''
andterminals
at
either
the
amplifier
or
the
speaker
terminals,
A
note
on
speaker
cable:
We
recommend
the
use
of
at
least
16
gauge
(AWG)
two
conductor
“zip”
cord
for
all
speaker-
connections
under
25'
in
length.
For
longer
amplifier-to-speaker
runs,
we
suggest
14
gauge
“zip”
cord.
If
you
so
desire,
specialty
wire
specifically
designed
for
high
quality
amplifier-speaker
interface
may
be
considered.
Consult
your
ADCOM
dealer
for
recommendations.
5
)
Connect
the
outputs
of
up
to
five
(5)
line
level
sources
(CD
player,
tuner,
etc.)
to
the
appropriate
inputs
on
the
rear
panel
of
the
GCA-510
(O
through
O
)
■
All
Inputs
are
electrically
identical.
Remember
to
observe
proper
channel
continuity
—
left
channel
output
to
left
channel
input
and
right
to
right.
The
RCA-
type
input
jacks
on
ADCOM
products
adhere
to
the
color
convention
of
white
for
left
channel
and
red
for
right.
Most
dual
coaxial
interconnect
cables
(or
“patch
“
cords)
also
follow
this
color
coding
or
mark
the
cables
in
other
obvious
ways
to
make
channel
continuity
easy
to
establish,
A
note
on
interconnects:
We
strongly
recommend
cables
with
low
capacitance
ratings.
These
will
provide
minimum
interference
for
component-to-component
signal
transfer.
If
you
desire,
you
may
opt
for
specialty
interconnects
specifically
designed
for
low
loss
signal
transfer.
Consult
you
ADCOM
dealer
for
recommendations.
6)
The
“Tape
Out”
connections
0
should
be
connected
to
the
inputs
of
your
system's
tape
or
disc
recorder.
As
long
as
you
do
not
attempt
to
run
a
patch
cord
from
either
channel’s
‘Tape
Out”
to
a
digital
recorder’s
digital
input,
you
should
experience
no
problem.
If
you
do
attempt
this
feat,
you
will
not
be
punished.
Nothing
will
happen.
Absolutely
nothing.
Eventually,
you'll
realize
the
mistake
and
correct
it
by
connecting
the
GCA-510’s
“Tape
Out”
jacks
to
the
analog
inputs
of
the
digital
recording
device.
Then
you'll
be
able
to
record.
The
‘Tape
Out”
jacks
are
buffered
(or
isolated)
to
preserve
signal
integrity
under
unusual
load
conditions.
In
other
words,
the
GCA-510's
sound
quality
will
be
unaffected
by
any
conditbns
inadvertently
imposed
by
the
recording
device
(low
impedances,
electrical
short
circuits,
etc.)
7)
(This
information
applies
only
to
certain
versions
of
the
GCA-510.
Consult
your
dealer
for
details.)
The
GCA-510
is
equipped
with
two
rear
panel
convenience
AC
outlets;
one
switched
0
and
one
unswitched
0,
Power
to
4
the
switched
outlet
is
controlled
by
the
front
panel
Power
switch
while
the
unswitched
outlet
carries
AC
current
whenever
the
GCA-510
is
plugged
into
a
live
AC
outlet.
The
power
ratings
for
fries©
outlets
are
as
follows:
500
VA
(equivalent
to
500
watts)
maximum
for
the
switched
outlet
and
800
VA
(or
watts)
maximum
for
the
unswitched
outlet.
The
switched
outlet
can
be
used
for
any
system
component
that
should
be
turned
on
or
off
when
the
GCA~510
is
powered.
Tuners
and
CD
players
are
the
most
likely
candidates.
The
unswitched
outlet
is
recommended
for
mechanical
devices
such
as
a
cassette
deck
where
premature
AC
power
interruptbn
can
result
in
damage
to
the
drive
assembly
or
for
other
source
components
where
a
constant
AC
source
is
required
to
maintain
internal
settings.
9
)
After
making
sure
that
the
“Level”
control
Ois
turned
completely
down
(counter-clockwise),
plug
the
GCA-510
into
an
AC
outlet,
preferably
one
that
is
NOT
controlled
by
a
wall
switch
or
other
device
that
may
be
turned
off
inadvertently.
If
you
live
in
an
area
supplied
with
115
Volt
AC,
we
strongly
recommend
use
of
ADCOM’s
ACE-515
AC
line
enhancer
and
sequential
switcher.
See
your
ADCOM
dealer
for
details.
9)
Use
the
“Power”
switch
Oto
turn
the
GCA-510
on.
The
“Power
Indicator
LED”
O
will
light.
10)
Select
a
source
for
playback
by
rotating
the
“Listening”
selector
©to
the
appropriate
input
position.
You
may
select
the
same
source
to
record
by
rotating
the
“Recording”
selector
©to
the
same
input.
You
can
simultaneously
select
a
totally
different
source
for
recording
by
simply
selecting
a
different
source
with
the
“Record¬
ing”
switch.
The
GCA-510
will
not
allow
a
potentially
destructive
feedback
condition
even
if
you
inadvertently
set
both
the
“Listening”
and
“Recording”
switches
to
the
Tape
position.
In
this
case,
the
GCA-510
will
automatically
mute
the
recording
output.
CARE
AND
FEEDING
OF
THE
GCA-510
ADCOM
has
taken
great
care
to
assure
that
your
GCA-510
is
as
flawless
in
appearance
as
it
is
electrically.
The
front
panel
is
a
heavy-gauge,
high
grade
anodized
aluminum
extrusion
bead
blasted
for
durability.
The
chassis,
rear
panel
and
top
cover
are
painted
and
baked
heavy
gauge
steel.
If
the
outer
cover
or
front
panel
becomes
dusty
or
fingerprinted,
please
clean
with
a
soft,
lintless
cloth,
SLiGHTLY
DAMPENED
with
a
very
mild
detergent
solution.
DO
NOT
SPRAY
OR
USE
LIQUIDS
OF
ANY
KIND
ON
YOUR
UNIT!
NEVER
USE
HARSH
SCOURING
POWDERS!
SERVICING
ADCOM’s
Technical
Service
Department
will
be
happy
to
answer
all
questions
pertaining
to
the
installation
and
operation
of
your
unit.
In
the
unlikely
event
of
difficulty,
please
contact
us
for
prompt
advice.
If
we
can’t
help
you
resolve
the
problem
immediately,
we
may
refer
you
to
an
authorized
repair
agency,
or
authorize
the
return
of
your
unit
to
our
plant.
All
written
inquiries
should
be
addressed
to:
ADCOM
Service
Department
11
Elkins
Road
East
Brunswick,
NJ.08816
USA
Telephone
inquiries
are
welcomed
from
Monday
through
Friday
between
9
AM
and
4
PM,
Eastern
Time:
(908)
390-1130
We’ll
also
be
happy
to
answer
FAX
inquiries.
Direct
them
to:
(908)
390-9152
and
include
your
FAX
number
for
our
response.
When
inquiring
about
your
unit,
please
include
the
serial
number,
the
name
of
the
dealer
from
whom
you
purchased
the
unit
and
the
date
of
purchase.
If
we
ask
vou
to
return
the
unit
to
us
for
service,
we
will
issue
a
specific
Return
Authorization
number
for
your
use.
UNDER
nS
cScUMsVaNCES
should
the
unit
be
SHIPPED
TO
US
WITHOUT
PROPER
AUTHORIZATION
OR
PACKED
IN
ANYTHING
OTHER
THAN
ITS
ORIGINAL
PACKING.
If
the
original
packing
has
been
lost,
discarded
or
damaged,
we
will
be
happy
to
supply
a
replacement
at
a
nommal
charge.
Please
mention
your
need
when
you
call
or
write.
Alwavs
ship
PREPAID
via
UPS
(United
Parcel
Service)
or
other
appropriate
carrier.
FREIGHT
COLLECT
SHIPMENTS
WILL
BE
REFUSED.
DO
NOT
SHIP
VIA
PARCEL
POST
as
the
packaging
will
not
necessarily
withstand
handling
by
our
Postal
Service.
5
GCA-510
SPECIFICATIONS
Power
Rating
(To
FTC
Requirements)
50
watts
continuous
average
power
into
8
ohms
at
any
frequency
between
20Hz
and
20kHz
with
both
channels
driven
at
iess
then
0.075%
THD.
75
watts
continuous
average
power
into
4
ohms
at
any
frequency
between
20Hz
and
20kHz
with
both
channels
driven
at
less
then
0.075%
THD.
iM
Distortion
(SMPTE)
1
watt
to
50
watts
into
8
ohms.
1
watt
to
75
watts
into
4
ohms.
iM
Distortion
(CCiF,
Any
Combination
from
4kHz
to
20kHz)
50
watts
into
8
ohms.
75
watts
into
4
ohms.
<
0.05%
<
0.05%
s;
0.02%
£
0
.
0
2
%
THD
+
Noise
at
50
watts
into
8
Ohms
(Typical)
20Hz.
10kHz.
20kHz
.
0
.
012
%
0.035%
..0.05%
THD
+
Noise
at
75
watts
into
4
Ohms
(Typical)
20Hz.0.025%
1kHz.0.018%
10kHz.0.04%
20kHz.0.055%
Frequency
Response
@
1
Watt
into
8
Ohms
10Hz
to
20kHz.+0,-,5dB
Power
Bandwidth
(-3dB)
.
3
Hz
to
100kHz
Dynamic
Headroom
Into
4
Ohms
.
2
.3dB
Signal
to
Noise
Ratio,
"A”
Weighted
50
watts
into
8
ohms.-
105dB
Gain
(Voume
control
@
Maximum)
.
3
1
dB
Damping
Factor
20Hzto
20kHz...^380
Rise
Time
5kHz,
65V
peak
to
peak
square
wave,
20%
to
80%.1.5us
Semiconductor
complement
.
3
3
transistors,
2
zener
diodes,
10
diodes,
1
IC,
1
diode
bridge
Power
Consumption
(Continuous,
Both
Channels
Driven)
Quiescent.50VA
Maximum
.600VA
50
watts
into
8
ohms.275VA
75
watts
into
4
ohms.420VA
General
Power
(avaiiabie
in
220V
or
240V
on
special
order).
Chassis
Dimensions.
Maximum
Dimensions.
Weight.
Weight,
Packed.
.120VAC/50-60H2
3"(76mm)
x
17"(432mm)
x
11VV'{286mm)
3V2''(89mm)
x
17"(432mm)
x
13''(330mm)
.15lbs.(6.8kg)
.17.5lb3.(7.9kg)
Table of contents
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