Operation And Controls - Avalon VT-737SP Operation Manual

Operation and
Controls

4.0 Operation and Controls

The following chapter describes the details of
your Vt-737sp and how to operate each func-
tion.
1 PREAMP GAIN
Continuously variable rotary control adjusts
input level of signal. This control will drve the
tubes harder to get more tube tone into the
preamp. The input has +36dB of headroom
before overload. You can use this control at min-
imum and maximum levels for different sounds
and colors. This control is a carefully configured
dual level control and does not change the feed-
back of the tubes.
2 INPUT
3-position rotary switch that selects between
LINE, INSTRUMENT, or MIC input sources. This
switch corresponds to the following physical
input connections on the Vt-737sp:
LINE - XLR input on back labeled LINE
INSTRUMENT - 1/4" input jack on the front
panel labeled INTSRUMENT HIGH-Z INPUT
MIC - XLR input on back labeled MICROPHONE
All three input sources may be connected simul-
taneously but only the source that is selected
by the INPUT switch is active.
Avalon Vt-737sp Operation Manual
3 HIGH GAIN
Boosts overall gain of the input/preamplifier
section by +8dB in Line mode and +18dB in Mic
or Instrument modes. The HIGH GAIN switch
fuctions with any selected INPUT position. This
extra signal boost can be effectively used in
conjunction with the OUTPUT control to over-
drive the vacuum tube stages. Various effects,
from soft tube overdrive to all out distortion can
be achieved.
4 PHASE
Reverses the output polarity. This feature
allows all three inputs the option of phase
reversal. Experiment with the phase switch to
defeat phase cancellation and create musical
effects.
The Vt-737sp always operates in "true phase"
from the input source to the output jack, wheth-
er bypassed or in-line (ie., a positive voltage on
input pin 2 yields a positive voltage on output
pin 2).
5 THRESHOLD
This control sets compressor threshold level.
Continuously variable from -30dB to +20dB.
6 METER
When engaged the VU meter monitors the gain
reduction of the compressor. When disen-
gaged, the VU meter monitors output level.
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