Impeccable clarity with tube warmth, presence, full-range versatility.

The Avalon VT 737SP is a combination of a tube preamp, optocompressor, sweep equalizer, output level, and VU metering in a 2U space. Balanced mic, front-panel instrument DI, and balanced line inputs. Class A preamp uses 2 cascaded, dual vacuum-tube triodes configured with minimum negative feedback. High-gain switch, high-pass filter, hardwire relay bypass.

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Avalon Vt 737sp Mono Mic Pre/Compressor/EQ Features:

Tube preamp
Opto-compressor
Sweep equalizer
Output level control
VU metering
Balanced mic input, front-panel instrument DI, and balanced line inputs
High-gain switch
High-pass filter
Hardwire relay bypass

Avalon Vt 737sp Mono Mic Pre/Compressor/EQ Specifications:

Circuit topology: 4 dual triode vacuum tubes (Sovtek 6922), high-voltage discrete Class A
Gain Range Microphone: Transformer balanced 850/2500 ohm, 0dB to +58dB Instrument: Unbalanced 1 meg ohm, 0dB to +30dB
Line: Balanced Class A 20k ohms, -27dB to 28dB
Maximum input level and connector types: Microphone26dB@25Hz, +30dB@1kHz balanced XLR Instrument+30dB unbalanced front panel jack socket
Line +36dB balanced XLR
Maximum output level: +30dB balanced 600 ohms, DC coupled, discrete Class A
Output type and gain: XLR connector, output trim gain -45dB to20dB
Noise 20kHz unweighted: -92dB
Noise microphone EIN: -116dB, 22Hz-22kHz unweighted
Distortion THD, IMD: 0.5%
Frequency response -2.5dB: 10Hz-120kHz input filter included
Frequency response -3dB: 1Hz-200kHz line in-out
VU meter and gain reduction: High quality illuminated OVU =+4dB and gain reduction to -20dB
High cut filter: Variable 6dB per octave 30Hz-140Hz
Compressor type: Optical passive attenuator incorporating twin vacuum tubes and stereo link
Threshold - Ratio: Threshold variable -30dB to +20dB, ratio-compression variable 1:1 to 20:1
Attack - Release: Attack variable 2mS to 200mS, release variable 100mS to 5 seconds
Equalizer type: Discrete Class A, variable active and switched passive design
Frequency bands (4): Treble - switched 10kHz, 15kHz, 20kHz, 32kHz, ±:20dB range, shelf High mid - variable 200Hz-28kHz and 2kHz -28kHz, ±:6dB range, hi-lo Q Low mid - variable 30Hz-450Hz and 300Hz-4k5Hz, ±:16dB range, hi-lo Q Bass - switched 15Hz, 30Hz, 60Hz, 150Hz, ±:24dB range, shelf
AC power: Internal toroidal 100v to 240v, 50-60Hz selectable, 75 watts maximum
Dimensions: 19 x 12 x 3.5 in (482 x 305 x 89mm)
Weight: 22lbs. (10kg)