Avalon VT 737SP

The Avalon VT737 SP Tube Voice Channel, delivers impeccable clarity with tube warmth and presence for your mic, instrument or line mono channel.

The Avalon VT737 SP Mono Mic Pre/Compressor/EQ is a combination tube preamp, opto-compressor and sweep equalizer, with output level and VU metering in 2 rackspaces. 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. The Avalon Vt 737sp has a high-gain switch, high-pass filter, and hardwire relay bypass..

The main features of the Avalon VT737 SP include:
 

• 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
   

The main specifications of the Avalon VT737 SP include:

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)