Note: If the Processor input is activated
by selecting the ‘Processor’ switch
position, all other inputs will be
deactivated. When recording from the
Processor input to the Record out of the
LS27, the level of the recording will be
dependent on the level setting of the
processor.
If you own a three-head tape deck, and
wish to monitor the actual tape while
making a recording (for a true ‘A-B’
comparison of signals before and after
recording), connect the tape deck
output to the Monitor input.
It is also possible to dub from one tape
deck to another. Simply connect the
output from one tape deck to an
unused set of inputs controlled by the
Input selector (Tuner, Phono, CD, etc.)
on the LS27. This signal will then be
routed to the second tape deck through
the Record output when the
appropriate input is selected on the
Input selector.
Troubleshooting
It is possible for a static discharge to
temporarily disable the microprocessor
that allows the controls to function. If
this should occur, depress the ‘Mute’
button, then turn off the preamp and
unplug the preamp from the A.C.
receptacle for 60 seconds. Reconnect
the A.C. plug and turn the preamp back
on, along with other components. The
controls should resume normal
operation. If the problem persists,
contact your dealer or Audio Research
Customer Service at 763.577.9700.
Servicing
Because of its careful design and
exacting standards of manufacture,
your LS27 should require no routine
maintenance. The remote control's
batteries (AAA) should be replaced
once a year.
Caution
Your LS27 contains sufficient
levels of voltage and
current to be lethal. Do not
tamper with a component
or part inside the unit. Refer any needed
service to your authorized Audio
Research dealer or other qualified
technician.
The vacuum tubes inside your LS27 are
quality 6H30 dual triode tubes and with
normal use should not need to be
changed for approximately 4,000 hours
of use. Replacement tubes should be of
equivalent quality and are available
from Audio Research.
Note that tube numbers (V1 and V2)
match printed numbers next to tube
sockets on circuit board.
Should service be necessary, please
contact your Audio Research dealer, or
Audio Research Customer Service at
763.577.9700.
Cleaning
To maintain the new appearance of this
unit, occasionally wipe the front panel
and top cover with a soft, damp (not
wet) cloth to remove dust. A mild, non-
alkaline soap solution may be used to
remove fingerprints or similar smudges.
Cleaners containing abrasives should
not be used as they will damage the
anodized finish of the front panel. A
small, soft paintbrush is effective in
removing dust from bevels, the recessed
nameplate and other features of the
front panel.
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