Maxon TBO-9 True Tube Booster/OD

The TBO-9 combines Clean Boost and Overdrive capabilities with a tube gain stage to create a versatile tone-shaping tool.
The ideal complement to non-master volume tube amps, the TBO allows you to drive a clean or semi-clean amp to the breaking point, giving it that “on 10” tonality at a much lower volume level and without altering the amp’s signature tone.
The TBO-9’s tube stage is controlled by the Boost knob which adds a fat, warm bottom end with a slight mid bump as it increases the output level.
The Drive knob blends clean and distorted signals, allowing the user to dial in a small amount of grit with minimal coloration.
The TBO-9 features internal voltage doublers that bump the incoming 9 VDC up to 30 VDC for massive headroom and maximum transparency.
When you need to drive your amp without driving the audience towards the door, the TBO-9 does the job without commanding the center stage.
The TBO-9 is the perfect complement to non-master volume tube amps, boosting level and drive while retaining maximum transparency.