Audio Research VSi75 User manual

VSi75

Integrated Amplifier

H I G H D E F I N I T I O N ®

User Guide

2Contents

Preface 3

Illustrations 4

Warnings 5

Installation

Vacuum Tubes 6

In your System 7

Connections

Rear Panel Connections 8

AC Power Connection 9

Operation

Power-up Procedure 10

General Notes about Usage 11

Resetting Controls 11

Automatic Mute Function 12

Front Panel Control Functions 13

Remote Control Functions 14

Maintenance

Adjusting Vacuum Tube Bias 15

Servicing 16

Cleaning 16

Disposal and Recycling Guidelines 16

Limited Warranty 17

Specications 18

Preface

Thank you for selecting the VSi75 as part of your music

listening system. The engineers and designers at Audio

Research have spent countless hours of listening and

testing to create an Integrated Amplier of the highest

caliber for music reproduction. The VSi75 has been

designed to provide you many years of playback.

Please take a few minutes to read through this guide

to help you better understand and optimize your new

integrated amplier. If you have any questions regarding

the operational functions, contact your dealer or

distributor for assistance.

Sit back and enjoy your new integrated amplier and the

enhancements it will bring to your system. The VSi75

will bring new life to your entire music collection.

Happy listening!

4Illustrations

POWER MUTE VOL DN VOL UP BIAS INPUT

CAUTION

FOR PROTECTION

AGAINST FIRE HAZARD

REPLACE FUSE ONLY WITH

SAME TYPE AND RATING

5A FUSE

SLO-BLO T4A (230V)

VSi75

INTEGRATED AMPLIFIER

WARNING

TO PREVENT FIRE AND SHOCK HAZARD, DO NOT

EXPOSE THIS DEVICE TO RAIN OR MOISTURE.

UNIT MUST BE OPERATED IN A HORIZONTAL POSITION.

-DO NOT OPERATE WITH COVERS REMOVED-

UNIT CONTAINS VOLTAGES WHICH MAY BE HAZARDOUS.

VOLTS

SERIAL

WARNING

RISK OF HAZARDOUS ENERGY!

MAKE PROPER SPEAKER CONNECTIONS

SEE OWNERS MANUAL.

PLYMOUTH, MINNESOTA

MADE IN U.S.A.

500W MAX 50/60 HZ

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION

TAPE

OUT

WARNING

RISK OF HAZARDOUS ENERGY!

MAKE PROPER SPEAKER CONNECTIONS

SEE OWNERS MANUAL.

Front Panel

Rear Panel

BIAS

VSi75

DSP DN

DSP UP

MONO

POWER

VOL DN

VOL UP

MUTE

HOURS

H I G H D E F I N I T I O N ®

Remote

Warnings

Do not touch hot tubes. Keep away from children.

To prevent re, or shock hazard, do not expose your VSi75 to rain or

moisture.

This unit contains voltages which can cause serious injury or death. Do not

operate with top plate removed. Refer servicing to your authorized Audio

Research dealer or other qualied personnel.

The detachable power cord on your VSi75 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 VSi75 chassis to provide absolute protection

from electrical shock.

For continued protection against re hazard, replace the fuse only with the

same type and rating as specied at the fuse holder.

The appliance coupler at the rear of this unit must be accessible for

emergency power disconnect.

A note about packaging...

Save all packaging in a dry place away from re hazard. Your VSi75 Integrated

Amplier is a precision electronic instrument and should be properly cartoned

any time shipment is made. Because of its weight, it is highly probable that

the unit will be damaged during shipment if repackaged in cartoning other

than that designed for the unit. 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

VSi75 from unnecessary damage or delay.

6Installation

Vacuum Tubes

Before you operate the VSi75

Your VSi75 amplier is shipped with the vacuum tubes packed in foam

blocks. These must be unpacked and installed before you attempt to

operate the amplier. Included are two matched pair of KT120 output tubes,

and two 6H30 dual triodes used in the input stage. Proceed according to

the following instructions.

Carefully remove each vacuum tube from its protective foam and match

its location “V” number (written on the base of the tube) to the “V” number

printed next to each socket. Firmly seat each tube in its matching socket,

taking care to “key” the tube pins to the socket holes. Retain the foam

blocks with other packing materials for possible future use.

If you are using the optional tube cover, be sure the VSi75 is rst turned off.

Remove the top cover screws, and install the cover on top of the top plate.

Insert and retighten screws.

Note: double damping rings are installed at the factory on each 6H30 tube

for maximum sonic performance.

V5 V6

V2 V3V1 V4

Installation

In your System

To insure normal component life and safe operation this unit must be

operated only in a horizontal (upright) position. Adequate airow and proper

cooling thereby can occur only if there is no restriction below, behind and

above the unit.

The four special non-marring elastomer feet provide adequate spacing only

from a smooth, hard surface. Never operate the unit while it is sitting on a

surface such as a rug or carpet.

If the unit is to be operated in an enclosed equipment cabinet, an exhaust

fan is desirable so as not to operate the VSi75 in overheated ambient air.

The “ambient” operating temperature should never exceed 120° F or 49°

C. Improper installation will cause premature tube failure and will affect 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

affected thereby, providing the requirements outlined above are adhered to.

8Connections

Rear Panel Connections

All ve sets of Single-Ended inputs are clearly marked to indicate use.

6-Output binding posts (+) and (-), L & R, for 4 or 8 ohm speaker connection

1 - Power line cord inlet

1 - Power line fuseholder

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.

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 VSi75. Connect the red or”+” speaker

terminal to the wire that connects to the “4” or “8” terminal on the VSi75,

and tighten the speaker terminals securely to ensure best sonic results.

About cables:

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.

Connect the VSi75 input to the source components using only the highest

grade of audio interconnect cables. To avoid sonic degradation use the

shortest practical length of cables.

Connections

AC Power Connection

It is essential that the amplier be connected to a wall AC power receptacle,

or a similar heavy-duty source. If it is connected to convenience receptacles

on preampliers, etc., the full sonic capabilities of both the VSi75 and the

preamplier will be compromised.

For the very best sonic performance, the VSi75 should be connected to its

own AC power circuit branch, protected by a 15 or 20 amp breaker. The

other audio equipment should be connected to a different power circuit

and breaker. Avoid the use of extension cords. If they must be used on a

temporary basis, use 14-gauge or heavier cords.

The VSi75 utilizes a compatible grounding system that generally does not

require a “ground lifter” adapter plug on the AC power cord to minimize hum.

The 14-gauge power cord supplied with the VSi75 has a standard three-

prong grounding plug to provide maximum safety when it is connected to

a grounded wall receptacle. If there is any question regarding the safety

of grounding procedures, be certain to seek competent help with the

installation.

If electronic crossovers or other AC powered equipment are used with the

VSi75 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.

10 Operation

Power-up Procedure

Make sure you have read and complied with the Installation and Connection

instructions prior to attempting operation.

Press the “Power” switch. The Audio Research logo will appear for a few

seconds, then “Mute” will ash and a numeric countdown will show on the

LCD display while power supply stabilizes, indicating operation of automatic

muting circuit. After this automatic muting period the LCD display will show

the normal operating screen, and “Mute” will no longer be ashing. Adjust

the Volume control to the minimum level as indicated by the front panel LCD

display. When the “Mute” button is pressed, “Operate” will show on the

LCD display, indicating the VSi75 is ready for operation.

Note: If the LCD display does not illuminate after pressing the power

button, check the appropriate fuse for failure. An extra fuse for A.C. power

is included with your VSi75.

Press Input selector for desired source; set remaining switch options to

desired positions.

Activate selected input source, then deactivate Mute switch and adjust

Volume control as necessary.

Your VSi75 should now operate satisfactorily. However, a full stabilization or

warm-up time of approximately one hour is recommended for best sonic

performance.

Shut-Down

Set Mute switch to “Mute” position.

Adjust Volume control to minimum setting.

Press the “Power” button to shut unit off.

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