Output Tube Bias Adjustment; Cleaning; Disposal And Recycling Guidelines; Warranty Terms And Conditions - Audio Research VS115 Owner's Manual

Model VS115
C A U T I O N: The VS115 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 capaci-
tors for some time. Refer any needed service to your autho-
rized Audio Research dealer or other qualified technician.
Replacement vacuum tubes may be obtained through your
authorized retailer or directly from Audio Research Cus-
tomer Service. For best performance, the 6550C output
tubes should be matched pairs.
Additional questions regarding the operation, maintenance
or servicing of your amplifier may be referred to Audio
Research Customer Service at (763)-577-9700.

Output Tube Bias Adjustment

As shipped from the factory, the output "bias"
adjustments are set for a nominal 65mA per 6550 tube.
Under these idle conditions the tubes are each dissipating
approximately 27 watts of their 48 watt rating (42
watt plate, 6 watt screen). This point of operation provides
"enriched" Class AB 1, and will satisfy the most critical
listener.
For best results, operate and adjust the VS115 at 120VAC.
Adjustment must be made under zero-signal conditions
after at least 15-20 minutes of uninterrupted stabilization
time.
A digital voltmeter capable of accurate measurements with
0.lmVDC resolution is preferred for accurate adjustment
(must have 3 1 / digit display). Use the plastic alignment
2
tool provided to make the adjustment. The measurement
points are banana test jacks at the rear of the VS115. Ad-
just the "b i as" for an average voltage reading of 65mVDC
(.065 Volt DC) between test jacks.

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 solu-
tion or dilute isopropyl alcohol may be used to remove
fingerprints or similar smudges. Cleaners containing abra-
sives should not be used as they will damage the anodized
finish of the front panel. A small, soft paint brush is effec-
tive in removing dust from bevels, the recessed nameplate
and other features of the front panel.
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Disposal and Recycling Guidelines

To dispose of this electronic product, do not place in land-
fill. In accordance with the European Union Waste Electri-
cal and Electronic Equipment (WEEE) directive effective
August 2005, this product may contain regulated materials
which upon disposal require special reuse and recycling
processing.
Limited Warranty
Audio Research Corporation products are covered by a 3-
Year Limited Warranty, or a 90-Day Limited Warranty
(vacuum 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 the
balance of warranty remaining after original shipment
to the retailer or importer.
In the United States, the specific terms, conditions and
remedies for fulfillment of this Limited Warranty are
listed on the warranty card accompanying the product in
its shipping carton, or may be obtained from the authorized
retailer or from the Audio Research Customer Service
Department. Outside the United States, the authorized
importing retailer or distributor has accepted the responsi-
bility for warranty of Audio Research products sold by
them. The specific terms and remedies for fulfillment of
the Limited Warranty may vary from country to country.
Warranty service should normally be obtained from the
importing retailer or distributor from whom the product
was purchased.
In the unlikely event that technical service beyond the
ability of the importer is required, Audio Research will
fulfill the terms and conditions of the Limited Warranty.
Such product must be returned at the purchaser's expense
to the Audio Research factory, along with a photocopy of
the dated purchase receipt for the product, a written
description of the problem(s) encountered, and any infor-
mation necessary for return shipment. The cost of return
shipment is the responsibility of the purchaser.