Skip to main content
Drunk Beaver FET OverBooster boost pedal top view
Drunk Beaver FET OverBooster boost pedal side view
Drunk Beaver FET OverBooster boost pedal jacks view
Drunk Beaver FET OverBooster boost pedal internals

FET OverBooster

Inspired by FA-1 circuit, offering versatile use as a preamp/boost


Only 3 left in stock. Grab yours until it sells.


FET OverBooster is our take on a discontinued Boss™ FA-1 FET Amplifier in a pedal format. The pedal could be used as a preamp/boost to drive your amp or as an overdrive. Overdrive mode enables asymmetrical soft clipping using orange LEDs. It uses NOS MC1458 (Motorola/TI) op-amp and Toshiba 2SK209-GR J-FET transistor and runs the circuit at +-9V to offer extended dynamics.


  • Range - frequency response control: bass/full frequency/treble booster.
  • Master - effect output level.
  • Impedance - controls the signal impedance when the pickup simulator is enabled, allowing you to adjust the interaction between your guitar and the pedal and fine-tune your tone.
  • Bias - adds gain and some grid, varies transistor bias point.
  • PU Sim toggle - switches pickup simulator. When the PU Sim toggle is off, the buffer and the Impedance pot are also bypassed, giving you a classic effect that is sensitive to the input signal and any other pedals in your chain.
  • LED brightness trimmer - placed on the PCB trimmer allows you to adjust the status LED brightness.

Power supply

9V DC adapter (Boss-style negative center) not included. No batteries. They are bad for the environment 🌲.

Voltage: 9V

Current draw: 5.0 mA


FREE Worldwide shipping 🌏

Learn more


Lifetime Warranty - feel free to contact us if you have any troubles with a pedal!