Preface
Please take time to carefully read and understand the
following instructions before you install or attempt to oper-
ate your Audio Research LS17 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 remove any vacuum
tubes unless this unit is turned off and disconnected
from the A.C. power outlet. Unit should be connect-
ed to the A.C. outlet and turned on only after all
vacuum tubes have been installed and appropriate
pane ls have be en repla ced and fastened. See
owner's manual for installation instructions.
Before replacing vacuum tubes, turn off unit, discon-
nect from A.C. outlet and allow installed tubes to
cool before attempting to remove them. Hot tubes
may cause burns or other injury if not allowed to
cool before removal.
When removing or installing tubes, do not touch tube
socket contacts or other components as the circuit
may retain sufficient levels of voltage and current to
cause injury or death.
Contact your dealer or Audio Research Customer
Service (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 LS17 has two microprocessor-driven rotary
controls.
Model LS17
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.
1
