Audio Research LS26 Owner's Manual - Model Ls26

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Preface

Please take time to carefully read and understand the

following instructions before you install or attempt to oper-

ate your Audio Research LS26 preamplifier. Becoming

familiar with the product and its correct operating proce-

dures will help assure you of maximum musical enjoyment

and reliable operation. The effort you invest now will be

well rewarded in the years ahead.

Warnings

1. To prevent fire or shock hazard, do not expose this

product to rain or moisture.

2. This unit operates on voltages which can cause serious

injury or death. Do not operate with covers removed.

Any necessary servicing should be carried out by your

authorized Audio Research dealer or other qualified

electronics technician.

3. The power cord supplied with this unit is safety-tested

and is equipped with a proper grounding plug. If used

normally, it will provide a safe earth ground connection

of the chassis. Defeat of the grounding plug or use

of a power cord without a grounding plug, or any

unauthorized modification of the active circuitry or

controls of this unit, automatically voids warranty

coverage, and could cause injury or death.

4. For safe operation and protection against fire hazard,

replace fuses only with those of the same type and

rating as those supplied with this unit.

Packaging

Save all packaging accompanying this product. You have

purchased a precision electronic instrument, and it should

be properly cartoned any time shipment becomes neces-

sary. It is very possible that this unit could be damaged

during shipment if repackaged in cartoning other than that

designed for it. The original packaging materials help pro-

tect your investment from unnecessary damage, delay and

added expense whenever shipment of this unit is required.

Installation of Vacuum Tubes

N o t e : This unit has been shipped with the vacuum tubes

installed in a protective foam block under the top cover.

Using a phillips-head screwdriver to loosen the fastening

screws, remove the top cover and set aside. Remove the

tubes carefully from the protective foam block and store

the foam block with the carton.

Warning!

Do not attempt to install or replace vacuum tubes

unless this unit is first turned off and disconnected

from A.C. power outlet. Unit should be connected to

A.C. outlet and turned on only after all vacuum tubes

ha ve be en i nst al le d an d a ppropri at e pa ne ls

replaced and fastened. See owner's manual for

installation details.

Before replacing vacuum tubes, turn off unit, discon-

nect from A.C. outlet and allow existing tubes to cool

before attempting to remove and replace with new

tubes. Hot tubes may cause burns or other injury if

not first allowed to cool.

When replacing tubes, do not touch other compo-

nents, as the circuit may retain sufficient levels of

voltage and current to cause injury or death.

Co nta c t Au dio Re se ar ch Cu stome r Se rvi c e

(763-577-9700) if you have any questions about

installing or replacing vacuum tubes in this unit.

Description of Controls

F ront Panel Rotary Contro l s

The LS26 has two microprocessor-driven rotary

controls.

The rotary control on the left adjusts Volume (output level)

up or down for both R and L channels. Volume control is

also selectable via Vol DN and Vol UP buttons on the

remote control. Volume adjustment is indicated in the

display window by numeric digits on 0 –103 scale.

Model LS26

R E A R

F R O N T

V 2

V 1

TUBE LOCATIONS

TOP VIE W

DO NOT ATTEMPT TO OPERATE THIS

EQUIPMENT BEFORE INSTALLING THE NUMBERED

VACUUM TUBES IN THEIR RESPECTIVE SOCKETS.

Diagram indicates relative positions of two 6H30 tubes

located on circuit board as viewed from the front and looking

down from above the preamplifier.

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Summary of LS26

Page 1
3900 annapolis lane north / plymouth, minnesota 55447-5447 / phone: 763-577-9700 fax: 763-577-0323 model ls26 stereo preamplifier owner’s manual.
Page 2: Model Ls26
Model ls26 model ls26 section page no. Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....
Page 3: Model Ls26
Model ls26 vacuum tube pre am pli fi er model ls26 high definition ® mono power bal/se proc monitor mute d i s p l a y model ls26 stereo preamplifier 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 oper...
Page 4: Model Ls26
Model ls26 1 cd phono aux 1 mon aux 2 tuner video display power mute vol dn vol up bal l bal r bal/se hours invert mono gain proc model ls26 adjusts illumination of display to eight levels plus off. Turns power on/off. Select one of six available audio inputs. Adjusts volume up. Visible as numeric r...
Page 5: Model Ls26
Preface please take time to carefully read and understand the following instructions before you install or attempt to oper- ate your audio research ls26 preamplifier. Becoming familiar with the product and its correct operating proce- dures will help assure you of maximum musical enjoyment and relia...
Page 6: Model Ls26
Do not turn volume up beyond normal listening levels when “mute” is engaged to avoid unexpected or possibly damaging sound levels. Reduce volume level whenever changing input sources, even when muted. The rotary control on the right selects any of six input sources connected to the preamp: cd, video...
Page 7: Model Ls26
H o u r s : when pressed, displays number of operating hours vacuum tubes have been in service. Warning: after replacing tubes, this function should be reset to “0” only by a qualified technician. Hours display can be reset to “0” by pressing black button labeled “reset hours” located on lower right...
Page 8: Model Ls26
Tape recording procedure when using the ls26 as a control center for recording, the program source to be recorded must be connected to one of the six inputs controlled by the input selector switch or to the processor input. This routes the selected program to the record output. Note: if the processo...
Page 9: Model Ls26
Limited warranty audio research corporation products are covered by a 3- year limited warranty, or a 90-day limited warranty (vac- uum tubes). This limited warranty initiates from the date of purchase, and is limited to the original purchaser, or in the case of demonstration equipment, limited to th...