Maxon TBO-9 True Tube Booster / Overdrive 

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.

Features

• Clean Booster/Overdrive pedal with Tube gain stage
• Employs mil-spec sub-miniature vacuum tube
• Great as a tube amp booster to add warmth
• Boost knob controls level of tube gain
• Dual-purpose Drive control with clean blend function
• True Bypass Switching