Features - Avalon VT-737SP Operation Manual

Introduction
It has +/-16dB amplitude control and a
high/low Q (bandwidth) swtich which musically
sharpens the filter's response from a Q of 0.2
(wide) to 0.85 (medium). The High Mid band
filter section is of the same type and covers a
frequency band of 200Hz to 2.8kHz. With the
X10 switch engaged, the filter covers the 2kHz
to 28kHz range. A high/low Q switch changes
the bandwidth in the same way as the Low Mid
band.
The output stage of the Vt-737sp is another
twin-triode vacuum tube stage driving a
balanced low-noise Class A DC-coupled
output amplifier. This stage includes an output
level control to give the final level adjustment
before leaving the unit via an XLR connector.
Inside view of Vt-737sp
Avalon Vt-737sp Operation Manual

1.2 Features

• Natural balanced musical performance
• 100% discrete pure Class A operation
• Three simultaneously available inputs
• Vacuum tube opto-compressor
• Four-Band active-passive equalizer
• Two-band EQ side-chain filter
• Variable high-pass filter on all inputs
• Twenty-two silver relays for signal routing
• True hard-wired Bypass
• Low noise, better than -90dB
• High operating headroom +30dB
• Fully balanced operation
• Advanced microphone transformer
• High-Z one megohm instrument input
• Balanced line input +36dB
• Tube-discrete balanced output amplifier
• 4 military grade dual triode vacuum tubes
• High voltage signal path
• 2U nineteen inch welded steel chassis
• Swtichable AC power supply 100-240V
• 150W toroidal shielded power transformer
• Discrete soft-start DC power regulators
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