The Avalon VT-737SP features a combination of tube preamplifiers, opto-compressor, sweep EQ, output level and VU metering. VT737SP"s preamp provides a 48V phantom powered input, an Instrument DI and a balanced line input. The Opto-compressor features twin Class A tube triodes for gain matching. 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 side-chain switch. The EQ section can be flipped pre or post-compressor. The high and low EQ bands provide the smooth characteristics of an all passive design, while the dual mid bands include variable frequency and switched Q-width selection. Whether you"re recording a solo vocalist or an acoustic instrument, mastering, or recording symphonies, let Avalon take you to the leading edge in analog and experience sonic reality like never before! Black and Blue VersionTo celebrate Avalon"s 10th Anniversary, they have released a special Black and Blue faced model. Same great features as the regular finish VT737SP but in a finish sure to attract onlookers. PreamplifierThe VT-737SP has 3 input selections: 1. The VT-737SP features a higher-performance microphone input transformer with +48V phantom selection. 2. Instrument DI high source input with jack located on front panel. 3. Balanced line input, discrete high-level Class A. The Class A preamplifier utilizes 2 cascaded, dual vacuum tube triodes configured with minimum negative feedback. A high gain switch boosts the overall gain of the preamplifier. The 4 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 3 inputs. Opto-CompressorThe opto-compressor features a minimum signal