TBO-9 TRUE TUBE BOOSTER/OVERDRIVE

The world's smallest tube-based booster/overdrive pedal, the TBO-9 features a US Military spec subminiature tube at its core. Subminiatures are the final frontier of vacuum tubes, as the supply of quality vintage tubes is rapidly dwindling. Used extensively during W.W. II, subminiatures were largely abandoned by 1955 in favor of transistor technology, leaving a healthy stock of quality NOS product behind.