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Ideal for high performance DAW input signal conditioning, stereo buss compression-EQ, stereo keyboards and analog mastering applications.

The Avalon VT-747SP combines a creative STEREO tube-discrete Class A spectral-opto-compressor with a musical six band program equalizer, L-R output level and gain reduction metering and internal regulated power supplies in a 2U space.

The opto-compressor features a minimum signal path design utilizing sealed silver relays for all signal routing and by pass functions. The optical attenuator acts as a passive level controller with a Class A, variable gain make-up amplifier. Full dynamic control from soft compression to hard-knee limiting can be achieved with master threshold, ratio-compression, attack and release controls. Gain reduction indication is a large analog VU meter. Low frequency and high frequency contour parametric spectral controls can be routed into the side-chain path for enhanced frequency dependent compression with variable frequency and threshold levels. SC listen provides side-chain listen mode for monitoring.

Six Band Program Equalizer
The Avalon VT-747SP equalizer utilizes 100% discrete, Class A high-voltage transistors for optimum sonic performance. The six band STEREO program EQ incorporates the smooth characteristics of an all passive design. The frequency turnover, Q and amplitude ranges have been carefully chosen for each band to provide the most natural harmonic balance and lowest phase change while offering simple and effective tone control. The EQ can be placed pre or post the opto-compressor for enhanced effects.

TSP - Twin Signal Path
The Avalon VT-747SP features TSP which gives you the choice of either tube tone or the classic, Class A discrete transistor sound by exchanging, three (3) high-voltage dual triode tubes with discrete amplifiers in the opto-compressor and primary output stages.

Input-Output and Metering
Fully balanced DC coupled, Class A discrete amplifiers are utilized for the input and output drive interface with+36dB input headroom. A high quality analog VU meter indicates accurate gain reduction. Twin 60dB range LED meters provide fast L-R output status of all levels.


  • Stereo Class A opto-compressor with spectral control
  • Stereo Class A six band discrete passive program EQ
  • TSP twin signal path, vacuum tube bypass
  • Low noise -92dB
  • Fully balanced Class A input and DC coupled outputs
  • Stereo dynamic 60dB high resolution output meters
  • High quality analog VU meter for gain reduction
  • High headroom+36dB input before overload
  • Spectral side-chain monitor for pre listen
  • EQ pre-post selection for opto-compressor
  • Sealed silver relays for all signal routing
  • Internal discrete regulated power supplies
  • Military spec vacuum tubes for long life and low noise
  • Specifications

    Circuit topology
    Three (3) dual triode vacuum tubes (Sovtek 6922), high-voltage discrete Class A mode

    Input gain range
    Balanced, Class A, 20k ohms, -20dB to +16dB with high gain switch

    Maximum input level
    +36dB balanced XLR pin 2 hot

    Maximum output level
    +30dB balanced 600 ohms, DC coupled, discrete Class A

    Output type
    XLR connector, output trim gain -45dB to +6dB

    20kHz unweighted -92dB

    Distortion THD, IMD

    Frequency response -3dB
    1Hz to 200kHz

    Gain reduction meter
    High quality, illuminated gain reduction meter 0dB to -20dB range

    Output meter
    Twin 20 segment LED VU meters with -27dB to +30dB range

    Compressor type
    Optical passive attenuator

    Make-up gain
    Variable 0dB to +10dB stereo tracking

    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

    Side-chain spectral contour
    Variable threshold -15dB to +15dB, frequency 70Hz to 9kHz twin ranges

    Equalizer type
    Discrete Class A, passive design optimized for full range program material

    Frequency bands (6)
  • Variable amplitude LF +/-24dB 15Hz shelf response
  • Variable amplitude MF1 +/-8dB 125Hz selected Q response
  • Variable amplitude MF2 +/-4dB 500Hz selected Q response
  • Variable amplitude MF3 +/-4dB 2kHz selected Q response
  • Variable amplitude MF4 +/-10dB 5kHz shelf response
  • Variable amplitude HF +/-20dB 32kHz shelf response

  • AC power
    Internal toroidal 100v to 240v, 50-60Hz selectable, 70 watts maximum

    19 x 12 x 3.5 in (482 x 305 x 89mm)

    22lbs (10kg)

    Dimensions-shipping carton
    21 x 18 x 8 in (533 x 457 x 203mm)

    26lbs (11.8kg)
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