The Avalon VT-737SP features a combination of TUBE preamplifiers, opto-compressor, sweep equalizer, output level, and VU metering in a 2U space.

PREAMPLIFIER
The VT-737SP has three input selections: 1. The VT-737SP features a higher-performance microphone input transformer with +48V phantom power selection. 2. Instrument DI high source input with jack located on the front panel. 3. Balanced line input, discrete high-level Class A. The Class A preamplifier uses two cascaded, dual vacuum tube triodes configured with minimal negative feedback. A high gain switch boosts the overall gain of the preamplifier. The four high-quality tubes are configured as single-ended anode-coupled followers. A passive-variable high-pass filter and hard-wire relay bypass complete the input signal conditioning. The phase reverse relay is available on all three inputs.

OPTO-COMPRESSOR
The opto-compressor features a minimal 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-essing 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-737SPs 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.

SWEEP EQUALIZER AND OUTPUT LEVEL
The VT-737SP equalizer uses 100% discrete, Class A high-voltage transistors for optimal sound performance. The high and low frequency bands offer the smooth characteristics of an all-passive design, while the dual mid bands include variable frequency and switched Q-width selection. The extended range of the mid bands is expanded into the high and low bands using X10 frequency multipliers. The bypass switch features 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 variable control of the overall signal path. The output amplifier uses another dual triode vacuum tube driving a 100% discrete, Class A, high-current, balanced, and DC-coupled low-noise output amplifier.

AVALON VT-737SP FEATURES

Vacuum tube triode signal path, transformer balanced microphone input, high-voltage circuits for maximum headroom to +30dB, low noise -92dB, internal discrete power supply with toroidal transformer, soft-start tube life extender, stereo link for compressors, all discrete Class A equalizer with musical passive filter design, sealed silver relays for signal routing, large control knobs with professional conductive plastic potentiometers, VU meter for output level monitoring and compressor gain reduction.