A compact pedal that simulates the pre-amp of a boutique 30W tube amp.

The FETBOX, which has been produced to be a long-selling product, has been reborn as the FETBOX CUSTOM by significantly changing the circuit structure, in order to make it easier to handle and to have a balance that is faithful to the tube sound.

The exterior operation unit is the same as the old model, but the style of sound and the operational feeling of the tone stack have massively evolved.

Compared to those using vacuum tubes and transformers, it is smaller, lighter, and can be easily incorporated into a pedalboard, resulting in a sound that comes close to a tube amp which you wouldn't imagine judging from its small appearance.

With CH2, you can create a wide range of sounds by adjusting the original TREBLE/BASS, and enjoy the finest crunch/overdrive sound.

It is made to be a versatile pedal that works well with both singles and hums, and even your transistor amp can be transformed into a tube-like sound.

By moving the HI GAIN switch to the up position, the gain can be increased even more to increase distortion, sustain, and low frequencies.

Even with CLEAN CH, the gain increases, but unnecessary distortion is added, so it is an option you can use when mainly using CH2.

* The tone control unit is exclusively for CH2.

Bypass switch

When the pedal is powered off, the mechanical relay control automatically switches to bypass state.

If the pedal is powered on again, it resumes to the state it was in when the pedal powered off.

Voltage monitoring function

The unit constantly monitors input voltage. When voltage is a certain level above or below 9V, the LED flashes and the unit automatically reverts to bypass state.

Please check your power supply voltage.


  • True Bypass
  • Blue LED
  • Power consumption :DC9V, 95mA
  • Power spply : Center negative DC9V out, 2.1mm pin *Batteries cannot be used
  • Dimensions : approx. D2.6” x W4.6" x H2.2” [D66mm x W117mm x H55mm]
    (Including the convex parts like the jacks, the knobs, the switches, etc.)


  • This unit is for a 9V drive only. In the event that excessive voltage has been input, the protection circuit of this unit may activate protection against a short circuit of the power supply causing the power supply to be cut. This protection circuit can protect the unit from short-term excess voltage such as surges, but if the voltage continues to be in excess for over a certain period of time, it will stop working and need repairing.
  • Failure caused by using a power supply different from that specified above is not seen as an initial failure and not covered by the warranty.
  • We do not offer warranties for any situations caused by misuse of this equipment.
  • Since this product is completed by hand, there may be unevenness in the paint or minor scratches.
  • The specifications in the instructions or the product's appearance may change without notice due to production conditions or other reasons.
  • Please make your decision after careful consideration, as we do not accept cancellations for reasons such as the product being different from your expectations.
  • We always conduct checks, so please confirm functionality after it arrives.
  • In the rare event of initial failure, we will provide support on our end. To add, the period during which we will provide support for initial failure is within 14 days after receiving your item.
  • If you desire a repair, please reach out to us, and we will provide support.

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