14
Auto Shut O
The VT80 is equipped with an auto shut o
feature, designed to turn the amplier o
after two hours of no signal being present at
the output of the amplier.
In the event that quiet music is listened
to at very low volumes, there may not be
adequate signal for the auto shut o circuit,
resulting in the amplier turning itself o. If
this is the case, please disengage the auto
shut o feature. The auto shut o feature
control switch is located on the back panel
of the VT80. Toggling the switch allows you
to turn the feature on or o.
Note: The auto shut o feature is not
in the signal path of the amplier and has no
deleterious sonic eect on music playback.
Break-in
All quality stereo equipment benets from
a break-in period; during this time, various
components change as electrical signals
pass through them. While your VT80 will
sound excellent out of the box, it will only
improve with continued use.
Auto Bias
The VT80 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 amplier. 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 auto bias circuit
Operation
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
benets 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.
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