The "TD-1 Tube Distortion" effect pedal, featuring a vacuum tube, was released in the early 1980s. It delivers a thick overdrive/distortion sound with the classic warmth unique to vacuum tubes, unlike transistors. While there is wear and tear, including worn rubber feet and adhesive marks from a non-slip sheet on the bottom, the unit is in relatively clean condition, and fully functional units are becoming rare. The vacuum tube lights up properly. The original knobs were chipped, so they have been replaced with new ones. The "GAIN" knob has no scratchiness or noise. The "LEVEL" knob has no scratchiness, but a "sizzling" sound appears as it's turned up. This is considered normal due to the distortion function. The screw threads were stripped, so they have been replaced with new screws of the same size. The tube distortion provides a unique warmth and thickness, resulting in a pleasant sound despite being a distortion effect. Serial number: 8204500 The unit has been tested and is in working condition, but please note that it is over 40 years old, and is sold as-is, with no returns or exchanges. #distortion #effector #vacuumtube #moog