Adcom GCA-510 User Manual

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GCArSIO

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.

CAUTION

RISK OF ELECTRIC SHOCK

A

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 carl, stand, tripod,
bracket, or table. The unit may fall, causing serious
injury 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 should 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.

1

ATTENTION

POUR PRÉVENIR LES CHOCS ÉLECTRIQUES NE PAS UTILISER
CETTE FICHE POLARISÉE AVEC UN PROLONGATEUR, UNE PRISE
DE COURANT OU UNE AUTRE SORTIE DE COURANT, SAUF SI LES
LAMES PEUVENT ÊTRE INSÉRÉES À FOND SANS EN LAISSER AU
CUNE PARTIE À DÉCOUVERT.

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 GROUNDING AS PER NATIONAL ELECTRICAL CODE INSTRUCTIONS

CONTAINED IN ARTICLE 810 • RADIO AND TELEVISION EQUIPMENT.

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 heal.

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.

POWER UNES

STANDOFF
INSULATORS, b

MAST

ANTENNA
LEAD-IN WIRE

ANTENNA
DISCHARGE
UNIT, c

TO EXTERNAL ANTEMNA

POWER SERVICE GROUNDING
ELECTRODE SYSTEM
(e. g. interior metal water pipe)

BONDING JUMPER,

OPTIONAL ANTENNA GROUNDING
ELECTRODE DRIVEN 8 FEET (2.44 M) INTO
THE EARTH IF REQUIRED BY LOCAL
CODES. SEE NEC SECTION 810-21 (f)

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 tor
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.

TERMINALS OF RADIO RECEIVER

GROUND WIRE, a,b

GROUND CLAMPS

INTRODUCTION

Congratulations on purchasing ADCOM's GCA-510 Control Amplifier, We designed this unique product for both simple
operation and exceptional sound quality, We don't anticipate any difficulty in setting up the GCA-510, but ask that you
do read the following instructions carefully 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. Although it offers the convenience of
an "integrated amplifier,” it is actually a very high gain power amplifier preceded by a passive level controller. There is
no separate preamplifier stage in the GCA-510 at all.

The circuit topology 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.