Adcom GCA-510 Manuel utilisateur

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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

0

<r>

O)

£

c

0

to

c

o

o

0

o

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cc

CQ

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>

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o

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o

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□

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D

LU

0

O

c

o

CL

O

O

_o

0

(f>

U)

c

ID

1_

o

o

o

□

:

2

GCA

-

510

REAR

PANEL

DIAGRAM

>.

c

o

C

0

O

0

0

■

o

0

O

■

a

o

£

E

CO

3

CO

0

TD

3

0

O

0

+-»

3

O

0

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□

H—

3

O

o

O

<

<

LJ

0

_C

■

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‘0

E

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-1—

•

0

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CO

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e

3

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©

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0

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CO

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rs

Q.

3

o

CD

CO

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a

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CO

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CO

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CL

0

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Z3

h-

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)