Audio Research FOUNDATION Series, Руководство пользователя

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Maintenance
the Customer Support Department of
Audio Research Corporation at service
@audioresearch.com. You may also initiate
a service request by visiting the Audio
Research website (www.audioresearch.com)
and selecting ‘Service Repair’.
Cleaning
To maintain the new appearance of this
amplifier, occasionally wipe the front
panel and top cover with a soft, damp
(not wet) cloth to remove dust when the
unit is powered off. 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 and the
acrylic insert of the front panel. A small, soft
paintbrush is effective in removing dust from
bevels and other features of the front panel.
Disposal and Recycling Guidelines
To dispose of this electronic product, do
not place in landfill. In accordance with
the European Union Waste Electrical and
Electronic Equipment (WEEE) directive
effective August 2005, this product
may contain regulated materials which
upon disposal require special reuse and
recycling processing.
Please contact your dealer or importing
distributor for instructions on proper
disposal of this product in your country. Or,
visit audioresearch.com for the name of your
importing distributor and how to contact
them. Packing and shipping materials may
be disposed of in a normal manner.
Vacuum Tubes
It is recommended that you replace the
vacuum tubes of your VT80 SE in sets.
All of the tubes in your amplifier have
been matched to have similar operating
characteristics, to provide the best sound
quality and reliability. In the event you need
to replace a single output tube, please refer
to the numbers written on the silver base
at the bottom of the vacuum tube. Audio
Research recommends replacing output
tubes after 3,000 hours of operation.
Servicing
Because of its careful design and exacting
standards of manufacture, your VT80 SE
amplifier should normally require only
minimal service to maintain its high level of
performance. Your VT80 SE is equipped with
individual fuses for each output tube. This
is to prevent circuit board damage should a
tube arc occur. These fuses are accessed on
the underside of the circuit board adjacent to
each tube. In the event a fuse opens, consult
a qualified service technician or Audio
Research Customer Service. High voltages
can exist long after the unit is turned off.
Use extreme caution.
Caution
Your VT80 SE amplifier contains sufficient
levels of voltage and current to be lethal. Do
not tamper with a component or part inside the
unit. Even with the power turned off, a charge
remains in the energy storage capacitors for
some time. Refer any needed service to your
authorized Audio Research dealer or another
qualified technician. Additional questions
regarding the operation, maintenance or
servicing of your amplifier, please contact
Auto Shut Off
The VT80 SE is equipped with an auto shut
off feature, designed to turn the amplifier off
after two hours of no signal being present at
the output of the amplifier.
In the event that quiet music is listened
to at very low volumes, there may not be
adequate signal for the auto shut off circuit,
resulting in the amplifier turning itself off. If
this is the case, please disengage the auto
shut off feature. The auto shut off feature
control switch is located on the back panel
of the VT80 SE. Toggling the switch allows
you to turn the feature on or off.
Note:
The auto shut off feature is not
in the signal path of the amplifier and has no
deleterious sonic effect on music playback.
Break-in
All quality stereo equipment benefits from
a break-in period; during this time, various
components change as electrical signals
pass through them. While your VT80 SE will
sound excellent out of the box, it will only
improve with continued use.
Auto Bias
The VT80 SE incorporates a highly
sophisticated auto-bias circuit for each
individual output tube. There are no user-
adjustable bias controls. Each tube will auto-
bias upon initial turn-on of the amplifier.
There should never be a need to check or
adjust the auto-bias circuit, once it is factory
set, no additional adjustment is required. The
Operation
auto bias circuit compensates to maintain
the proper bias as the tubes age. Auto-bias
sets idle current at 65ma per tube.
It is always recommended owners purchase
replacement tubes from Audio Research
Corp. It is still recommended that matched
sets of output tubes be installed. While
auto-bias will correct for mismatches, sonic
benefits still apply with matched tubes.
The auto bias circuit will not accommodate
output tubes with extremely high or low
plate current readings. Aftermarket tubes
may not be tested to the same rigorous
standards as Audio Research tests, so
care must be exercised when installing
aftermarket tubes. If uncertain about
aftermarket tube requirements, please
contact Audio Research Customer Service
for recommendations.