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TUBE G31 Mono Tube Preamp & Compressor

The G31 is a signal processor that utilizes both valve and transistor technology. The audio processing units of the G31 can support high quality signal paths while producing particular valve audio peculiarity by adopting low noise solid-state electronic components, and perfect valve circuitry. The G31 has various comprehensive functions for sound control which offers users clear and exquisite high quality sound.

► Preamp & Compressor with Tube Technology
► 48V phantom power switch
► Compressor with Comprehensive Functions
► Two instrument inputs
► VU metering of output level and compressor gain reduction
► LED gives a visual indication of the signal level
► Hi-pass 90Hz filter on the input stage
► Insert function


  • Inputs:
  • Balanced line inputs, switchable for +4dBu / -10dBu nominal level.
  • Unbalanced instrument inputs, input impedance 1Megohm.
  • Balanced microphone input, common to both channels.
  • Outputs:
  • Balanced line outputs, switchable for +4dBu / -10dBu nominal level.
  • Unbalanced line outputs, switchable for +4dBu / -10dBu nominal level.
  • Maximum Levels:
  • Line inputs +26dBu.
  • Instrument inputs +10dBu.
  • Mic input +30dBu.
  • Balanced outputs +26dBu.
  • Unbalanced outputs +20dBu.
  • Gain Range:
  • Line inputs +/-20dB.
  • Instrument inputs 0 to +40dB.
  • Mic input switchable -20dB to +40dB with +/-20dB trim.
  • Output fader +15dB maximum gain.
  • Frequency Response: All inputs 10Hz to 40KHz, +0/-2dB.
  • High Pass Filter: -3dB @ 90Hz, -12dB per octave.
  • Distortion (THD+N): Typically 0.1% @ 0dBu, rising to 0.3% @ +15dBu (1KHz).
  • Hum and Noise:
  • -84dBu, 22Hz - 22KHz, line input @ 0dB gain.
  • -82dBu, 22Hz - 22KHz, instrument input @ +20dB gain.
  • -122dBu (EIN) mic input at +60dB gain, 22Hz - 22KHz.
  • Stereo Compressor by manual control:
  • Threshold continuously variable -20dBu to +10dBu.
  • Ratio continuously variable 1:1.5 to 1:30.
  • Attack switchable 0.5ms or 5ms.
  • Release switchable 0.2s or 1.5s.
  • Knee switchable “Hard” or “Soft”.
  • Metering:
  • Illuminated VU meter displaying Channel 1 + 2 with 10dB pad.
  • Meter switchable to display Compressor gain reduction.
  • Variable intensity “Drive” LED, illuminating from +8dBu to +18dBu.
  • “Peak” LED monitoring whole signal chain, illuminating 6dB before clip.
  • Power Requirements:
  • Internally set to 230V 50Hz or 115V 60Hz operation.
  • Detachable IEC power cord.
  • Power consumption 30VA.
  • Dimensions: 19” rack mounting, 2U high.
  • W x H x D: 483 x 88 x 210mm (19.0” x 3.5” x 8.2”)
  • Shipping Weight: 6 kgs.
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