Audio Research GSPre User manual

H I G H D E F I N I T I O N ®

GSPre

Stereo Preamplier

User Guide

Thank You.

Thank you for choosing the GSPre 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 preamplier. Once installed,

please allow an appropriate break-in

period to fully appreciate the benets this

preamplier will provide to your system.

After reading the user guide, if you have any

further questions regarding your preampli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

Operation

Front Panel Controls and Displays

Start-Up

Shut-Down

Break-in

Front Panel Controls

Remote Only Functions

Settings Menu

Auto Shutdown

Processor On/O

Tube Hours

Maintenance

Servicing

Cleaning

Disposal and Recycling

Guidelines

Warranty

Specications

Warnings

Installation

Before Operating the GSPre

In Your System

Connections

Back Panel Connections

Input Connectors

Output Connectors

A.C. Power Connection

RS-232 Control

IR Input

12V Trigger Jack

Warnings

To prevent re, or shock hazard, do not

expose your GSPre 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 GSPre 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 GSPre 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.

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.

The GSPre also has automatic muting to help protect

system components in the event of low line voltage.

When sensing low line voltage, the preamp displays ‘Low

Line’ and automatically goes into ‘Mute’. This condition

will persist until the line voltage returns to a safe

operating level; please note the unit will remain in ‘Mute’

even after ‘Low Line’ no longer appears.

Note that automatic muting is only designed to

protect against power line interruptions or severe

voltage drop. It will not mute in the event of

subsonic transmissions from a faulty input source,

amplier failure or speaker malfunction.

A note about packaging...

Save all packaging in a dry place away from re hazard.

Your GSPre preampli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 GSPre from unnecessary damage or delay.

Before operating the GSPre

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

pairs of 6H30 tubes for the line stage, and one matched

pair of 6H30 tubes for the phono preamplier. Remove

the tubes carefully from the protective foam. Using

a phillips-head screwdriver to loosen the fastening

screws, remove the top cover and set aside.

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 GSPre 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

left channel right channel

phono stage

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.

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 preampli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 preampli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.

Do not stack the preamplier on top of a power amplier:

not only could this cause overheating, but hum may be

introduced into the preamp from the proximity of the

amplier’s power transformer.

Do not stack components or other objects directly on top

of the GSPre.

Connections

Back Panel Connections

A.C. Power

Connector

IR Input

12V

Trigger

RS-232

Connector

Fuse

Holder

Inputs Main

Outputs

Connections

Input Connectors

The GSPre provides four pairs of single-ended input

connectors: SE1 - 3, and PHONO. Please note that

input SE3 can be selected as a unity gain ‘processor’

input; in this case, SE3 should only be connected to

a component with a volume control (such as a home

theater processor). For further information about the

SE3 processor mode, see the section ‘Processor’ on page

16. In addition, there are two pairs of balanced input

connectors: BAL1 and BAL2.

Note

The phono stage of the GSPre has a gain of 58 dB; please

keep this in mind when selecting a phono cartridge to pair

with your preamplier. Audio Research recommends a

phono cartridge within an output voltage range of 0.5 mV

to 2.5 mV.

Output Connectors

One pair of balanced and one pair of single-ended main

output connectors are provided.

A.C. Power Connection

It is important that the GSPre be connected via its

supplied 15 amp IEC 14-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 GSPre for On/O control of the preamplier,

or the IR input, RS232 or remote control.

RS-232 Connection

The RS-232 connection allows for remote control via

systems such as Creston or other automation systems.

IR Input

The IR input can be used to link the GSPre to an IR repeater

system with a standard mono 1/8” connector.

12V Trigger Jack

The +12V DC output connector provides the ability to

remotely turn on and o other linked components such

as power ampliers having similar capabilities.

Operation

Input

Select

Volume

Control

Cartridge

Impedance

Front Panel Controls and Displays

Menu Button

Power

On/O

Function

Indicators

Function

Buttons

side panel

Headphone

Output

Table of contents

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