The Avalon VT-737sp features a combination
of TUBE preamplifiers, opto-compressor,
sweep equalizer, output level and VU
metering in a 2U space. The Avalon VT-737sp
preamplifier has three input selections:
1. Transformer balanced microphone input,
+48v phantom selection. 2. Instrument DI
high source input with jack located on front
panel. 3. Balanced line input, discrete highlevel
Class A. The high-performance
preamplifier utilizes two cascaded, dual
vacuum tube triodes configured with
minimum negative feedback. A high gain
switch boosts the overall gain of the
preamplifier. The four high quality tubes are
configured as singled ended anode coupled
followers. A passive-variable high pass filter
and hard-wire relay bypass completes the
input signal conditioning. The phase reverse
relay is available on all three inputs
OPTO-COMPRESSOR
The opto-compressor features a minimum
signal path design with twin Class A vacuum
tube triodes for gain matching. The optical
attenuator acts as a simple passive level
controller. Full dynamic control from soft
compression to hard-knee limiting can be
achieved with threshold, ratio-compression,
attack and release controls plus gain reduction
selection on the large VU meter.
Special spectral control including de-ess is
available with the dual sweep mid EQ to
sidechain switch. The EQ section can be
flipped pre or post the opto-compressor via a
front panel switch for alternate effects and
tone shaping. Two VT-737 SP’s can be linked
via a rear panel link cable for stereo tracking.
The compressor bypass is a sealed silver relay
for the most direct signal path
EQUALIZER
The Avalon VT-737sp equalizer utilizes 100%
discrete, Class A-high-voltage transistors for
optimum sonic performance. The high and
low frequency bands provide the smooth
characteristics of an all passive design, while
the dual mid bands include variable frequency
and switched Q-width selection. The
enhanced range of the mid bands is extended
into the high and low bands by the use of X10
frequency multipliers. The bypass switch
incorporates a sealed silver relay for the most
direct signal path. When the EQ to sidechain
is engaged, the high-low EQ remains in the
audio path for tone enhancement. The output
level control provides a variable control of the
overall signal path. The output amplifier
utilizes another dual triode vacuum tube
driving a 100% discrete, Class A, highcurrent,
balanced and DC coupled low noise
output amplifier.
Get your Avalon VT-737sp today !
