Avalon Microphone Preamps: Avalon VT-737sp 10th Anniversary Edition Tube Channel Strip

Avalon VT-737sp

Class A Mono Tube Channel Strip combines a tube microphone preamp, instrument DI, opto-compressor, and a 4-band parametric EQ. The VT-737sp not only offers incredible warmth, depth and character to digital recordings but it's a perfect front-end for digital audio workstations and broadcast studios.

Avalon has produced a special "Blackface" model to celebrate the release of the renowned VT-737SP Tube Channel Strip. The VT-737SP 10th Anniversary Edition tube channel strip is identical in terms of circuitry, the only difference being cosmetic; the front panel is matte-black and the original orange LEDs have been replaced with cool blue ones.

Features

Minimal signal path design
Four Class A vacuum tube triodes
Transformer balanced microphone input
EQ to sidechain for de-ess
High-voltage circuits + 200v
Headroom to +30dB
Low noise -92dB
Internal discrete power supply
Soft-start tube life extender
Stereo link
All discrete Class A equalizer
Sealed silver relays
Professional VU meter

Specification

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)

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