Avalon - VT 737 SP Microphone preamplifier

Four valve triodes for a warm, detailed sound
Transformer-balanced microphone input with +48 V phantom power
Three inputs: microphone, instrument (DI) and balanced line input
Opto-compressor with adjustable settings for threshold, ratio, attack and release
Dynamic control, from soft compression to hard limiting
Mid EQ with dual sweep, de-esser and sidechain option
Discrete Class A equalizer with variable and passive filters
Four frequency bands with extended control ranges and selectable Q
The equalizer can be switched pre- or post-compressor
Stereo Link function for operation with two units
Large illuminated VU meter for monitoring output level and gain reduction
Variable passive high-pass filter and phase-inversion circuit
Soft-start technology for longer tube life
Maximum output level of +30 dB with balanced XLR output
Frequency range from 10 Hz to 120 kHz for exceptional clarity
Robust construction with high-quality controls and sealed relays