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Avalon Design VT 737 SP Class A Mic Preamp

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Payments from only £67.89 a month

Finance Options

Payments from only £67.89 a month

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Class A Inst/Mic Preamp
The 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.

The opto-compressor features a minimum signal path design with twin Class A vacuum tube triodes for gain matching. The optical attenuator acts as a simple passive level controller. 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 the opto-compressor via a front panel switch for alternate effects and tone shaping. Two VT-737SPs can be linked via a rear panel link cable for stereo tracking. The compressor bypass is a sealed silver relay for the most direct signal path.

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  • 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
  • [email protected], [email protected] 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 to 22kHz unweighted
  • Distortion THD, IMD
  • 0.5%
  • Frequency response -/2.5dB
  • 10Hz to 120kHz input filter included
  • Frequency response -3dB
  • 1Hz to 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 to 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 to 2k8Hz and 2kHz to 28kHz, /- 16dB range, hi-lo Q Low mid - variable 30Hz to 450Hz and 300Hz to 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
  • 22 lbs (10 kg)
  • Dimensions - Shipping Carton
  • 21 x 18 x 8 in. (533 x 457 x 203mm)
  • Weight - Packed
  • 26 lbs (11.8 kg)


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GAK.CO.UK LTD is registered in England and Wales 04578270. Registered office: 30 - 34 North Street Hailsham East Sussex BN27 1DW GAK.CO.UK LTD acts as a credit broker and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. GAK.CO.UK LTD is an appointed representative of The Guitar Amp and Keyboard Centre Limited which is authorised and regulated by the Financial Conduct Authority. GAK.CO.UK LTD FCA registration number is 731400. The Guitar Amp and Keyboard Centre Limited FCA registration number is 684977. Credit provided subject to age and status

V12 Retail Finance Limited. Registered in England and Wales 4585692. Registered office: One Arleston Way, Solihull, B90 4LH. Authorised and regulated by the Financial Conduct Authority. Our FCA reference number is 679653.

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