Preface
Please take time to carefully read and
understand the following instructions
before you install or attempt to operate
your Audio Research LS27 preamplifier.
Becoming familiar with the product and
its correct operating procedures 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 necessary. 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 protect your
investment from unnecessary damage,
delay and added expense whenever
shipment of this unit is required.
Installation of Vacuum Tubes
Note: 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 have been
installed and appropriate panels
replaced and fastened. See owner's
manual for installation details.
Before replacing vacuum tubes, turn off
unit, disconnect 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 components, as the circuit may
retain sufficient levels of voltage and
current to cause injury or death.
Contact Audio Research Customer
Service (763.577.9700) if you have any
questions about installing or replacing
tubes in this unit.
Do not attempt to operate
this equipment before
installing the numbered
vacuum tubes in their
respective sockets.
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