Audio Research GS150 Manuel utilisateur

H I G H D E F I N I T I O N ®

GS150

Stereo Power Amplier

User Guide

Thank You.

Thank you for choosing the GS150 to be a

part of your high performance music listening

system. Since 1970, Audio Research has

been creating some of the world’s nest

audio equipment. Each piece is handcrafted

in Minnesota, and has been designed to

provide many years of listening enjoyment.

We understand you are eager to begin listening;

however, please take a few minutes to read

through this guide for useful information

concerning the operation of your new amplier.

Once installed, please allow an appropriate

break-in period to fully appreciate the benets

this amplier will provide to your system.

After reading the user guide, if you have any

further questions regarding your amplier,

contact your dealer or Audio Research

customer service - they will be happy to help

you make the most of your new component.

Happy Listening!

Contents

Warnings

Installation

Before Operating the GS150

In Your System

Connections

Input Connectors

Output Connectors

Matching

A.C. Power Connection

Remote Turn-on

RS-232 Control

Operation

Front Panel Controls and Displays

Back Panel Controls and Connections

Start-Up

Shut-Down

Cooling Fan Speed Adjustment

Display Brightness Adjustment

Hour Counter

Auto Shut O

Break-in

Output Tube Bias Adjust

Maintenance

Servicing

Cleaning

Disposal and Recycling

Guidelines

Warranty

Specications

Warnings

To prevent re, or shock hazard, do not

expose your GS150 to rain or moisture.

Do not place objects containing water on top of this unit.

This unit contains voltages which can cause serious

injury or death. Do not operate with covers

removed. Refer servicing to your authorized Audio

Research dealer or other qualied personnel.

The detachable power cord on your GS150 is equipped

with a heavy gauge, 3-conductor cable and a standard

three-prong grounding plug. For absolute protection,

do not defeat the ground power plug. This provides

power line grounding of the GS150 chassis to provide

absolute protection from electrical shock.

The appliance coupler (a.c. power connector)

at the rear of this unit must be accessible

for emergency power disconnect.

The GS150 is shipped with a protective, power-

ventilated cover. While the cover may be removed,

its use is recommended to prevent accidental

contact with the hot vacuum tubes. The protective

cover is also recommended to provide powered

ventilation if the amplier is mounted in shelving.

For continued protection against re hazard,

replace the fuse only with the same type and

rating as specied at the fuse holder.

The power button on the front of this unit, when

o, does not disconnect all power from this

unit. This unit is in sleep mode when not on.

This unit is RoHS compliant.

A note about packaging...

Save all packaging in a dry place away from re

hazard. Your GS150 amplier is a precision electronic

instrument and should be properly cartoned any time

shipment is made. You may not have occasion to

return your unit to the factory for service, but if that

should prove necessary, or other occasion requiring

shipment occurs, the original packaging will protect

your GS150 from unnecessary damage or delay.

Before operating the GS150

This unit has been shipped with the vacuum tubes

installed in protective foam in separate boxes packed

inside the shipping carton. Included are two matched

quads of KT150 power output tubes and four 6H30 tubes.

Remove the tubes carefully from the protective foam.

To remove the top cover

Using a phillips-head screwdriver to loosen the fastening

screws from the front and back edges of the tube cover

(you do not need to remove any screws from the side

panels of the cover). Note that the screws between

the tube cover and transformer cover can be dicult

to reach; the included screwdriver will reach them as

well as provide a magnetic tip to remove the screws.

Once all of the screws have been removed, carefully

lift the cover and detach the ventilation fan

power plug located at the back of the unit/cover.

Note that the plug has a screw-type securing

connector; turn counter-clockwise to loosen.

Installation

After removing the top cover and the vacuum tubes

packed in protective foam, see the accompanying

illustration for instructions on installing the tubes for

your GS150 in their proper locations in the chassis. Note

that the numbers written on each tube correspond

to a ‘V’ number etched on the chassis next to each

tube socket. Insert each tube rmly, carefully aligning

the tube pins with the corresponding socket holes.

Installation

In your system

To insure normal component life and safe operation

this unit must be operated only in an upright position.

Adequate airow and proper cooling can occur only if

there is no restriction above and behind the unit and

on either side. Be sure that airow to the 12V D. C.

cooling fans located on the rear panel is not blocked.

The special non-marring elastomer feet provide

adequate spacing and stability only on a smooth,

hard surface, and also assist to isolate the amplier

from spurious vibrations. For upright stability and

best performance, never operate the unit while it is

sitting on a soft surface such as a thick rug or carpet.

Due to its weight, this amplier must be supported

on a surface specically rated for such a load. Check

with the manufacturer of your support system

to be sure it is rated to handle this weight.

If the unit is to be operated in an enclosure such as an

equipment rack, make certain that adequate airow

above and to each side of the unit is provided.

The ‘ambient’ operating temperature should never

exceed 120 F or 49 C. Improper installation will

cause premature tube failure and will aect your

warranty, as well as the service life of the unit.

It is normal for a vacuum tube power amplier to run

quite warm, and if used for prolonged periods, hot

to the touch. All components within are, however,

operated at safe, conservative levels and will not

be improperly aected thereby, providing the

requirements outlined above are adhered to.

Connections

Input Connectors

The GS150 uses a fully balanced circuit topology

and has a pair of balanced XLR input connectors

on the rear panel. It therefore requires a balanced

preamplier output, as provided by most Audio

Research preampliers. Connect your preamplier’s

output to the GS150 before turning on the amplier.

Output Connectors

Proprietary, heavy-duty output terminals are provided on

the rear panel for 4 or 8-ohm speaker impedance loads.

Using high-quality speaker cables, securely fasten the

(-) speaker lead to the appropriate (black) terminal,

then the (+) lead to the matching (red) terminal. Follow

your speaker manufacturer’s impedance specication.

The GS150 puts out the same amount of power

whether the 4 or 8-ohm terminals are used.

Important

Use the best available speaker wires and interconnects.

Audio Research cannot emphasize this enough. As

better components and systems are developed,

it becomes increasingly important to avoid the

limitations of inferior system interconnections.

It is important sonically that your entire system be

connected so that the audio signal arriving at the

speakers has correct, or ‘absolute’ polarity (i.e.,

non-inverted). Connect the black or ‘–‘ speaker

terminal to the wire that connects to the ‘0’ terminal

on the GS150. Connect the red or ‘+’ speaker

terminal to the wire that connects to the ‘4’ or ‘8’

terminal on the GS150 and tighten the speaker

terminals securely to ensure best sonic results.

Matching

It is important to use as close as possible an

impedance match between the amplier and speaker

for optimum transfer of power to the speaker

with minimum distortion. In the case of speaker

systems with signicant variations in impedance

throughout the frequency spectrum, such as most

electrostatic types, determine the best impedance

match empirically for best overall sonic results.

Connect the GS150 input to the preamplier or

electronic crossover, using only the highest grade of

audio interconnect cables. To avoid sonic degradation

use the shortest practical length of cables.

Connections

A.C. Power Connection

It is important that the GS150 be connected via its

supplied 20 amp IEC 12-gauge power cord to a

secure, dedicated A.C. power receptacle. Never

connect to convenience power receptacles on other

equipment. Only use the power switch on the front

of the GS150 for On/O control of the amplier, or

the 12V start-up trigger for remote installations.

The AC power source for the GS150 amplier should

be capable of supplying 10 amperes for 100 or 120

volt units, or 5 amperes for 220 or 240 volt units.

For the very best performance on 100 or 120 volt circuits,

the GS150 should be connected to its own AC power

circuit branch, protected by a 15 amp breaker. The

preamplier and other audio equipment should be

connected to a dierent power circuit and breaker.

The GS150 should be turned on after the other

components of your system. If the GS150 is turned

on before other components, the amplier will

amplify any extraneous turn-on noises those

components might generate, which could potentially

damage the loudspeakers. Good operating practice

dictates that the amplier should be turned on

last, and turned o rst in an audio system.

The GS150 uses a grounding system that does not require

a ground-lifter adapter plug on the A.C. power cord to

minimize hum. The power cord supplied with the GS150

has a standard grounding plug to provide maximum

safety when properly connected to a grounded wall

receptacle. If there is any question regarding proper

grounding procedures in your installation, seek help

from a qualied technician. Caution should be taken

before using custom after-market power cords: they

must be at least 12-gauge and have a standard grounding

plug properly installed. These power cords are to be

used with caution, at the sole risk of the owner.

If electronic crossovers or other AC powered equipment is

used with the GS150 it may be necessary to use ‘ground

lifter’ adapters on the power plugs of that equipment

to minimize system hum. Generally, the lowest hum is

achieved when the only direct connection between audio

common ‘ground’ and true earth ground occurs in the

preamplier, through its grounded power cord. Other

equipment in the system should have some form of

isolation to prevent ground loops and associated hum.

Connections

Remote Turn-on

The GS150 has a built-in 12VDC remote turn-on/o

circuit for operation by a master control system

in a home theater or large audio system. Use a

3.5mm (.140”) diameter mono mini plug to connect

to the +12V IN jack on the rear of the GS150.

The +12V IN jack should be connected to the +12VDC

output of the master control system, using a

continuous +12VDC signal at 12mA per GS150 for

the duration of amplier on-time. Do not use

a momentary or data pulse control signal.

The +12VDC remote jacks have polarity protection, so

they will not operate if a -12VDC signal is accidentally

connected, or if the control wires are reversed.

RS-232 Control

The GS150 has an RS-232 connector on the back panel,

in the event the amplier is incorporated into an

automated or two-way remote communication

system. Please see your dealer or contact

customer service at Audio Research to acquire the

specic codes relative to the RS-232 control.

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