SBVT will be temporarily unavailable for order as I work on a redesign for the circuit. I apologize for the inconvenience.

SBVT (Sushi Box Valve Technology) is my take on the Ampeg SVT preamp. It uses a pair of 12AX7 tubes to give everything from rich cleans to gritty distortion. The 8-way mids frequency selector switch adds extra flexibility, allowing the EQ to be tailored to exactly the tone you need.

The SBVT is a little on the bright side making it a great fit for guitar, and the ultra-lo switch warms the tone up beautifully, making it a perfect tone for bass. The ultra-hi switch also adds an extra option for when you need to cut through the mix a little better.

Old Mid Frequencies:

  1. 201 Hz
  2. 428 Hz
  3. 494 Hz
  4. 605 Hz
  5. 672 Hz
  6. 1.17 Khz
  7. 1.66 Khz
  8. 3 Khz

New Mid Frequencies as of August 2021 batch:

  1. 220 Hz
  2. 450 Hz
  3. 600 Hz
  4. 800 Hz
  5. 1.2 Hz
  6. 1.3 kHz
  7. 1.6 kHz
  8. 3 kHz
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Additional information


Bass, Gain, Master, Mid Frequency Selector, Mids, Treble, Ultra-Hi, Ultra-Low

Footswitch Behavior



2x 12AX7

Milliamp Draw

900mA @ 9vdc Warmup, 480mA @ 9vdc After Warmup


Center-negative, like most guitar pedals



Guitar Demos

Bass Demos