The "TD-1 Tube Distortion" effect pedal, equipped with 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 on the rubber feet, and traces of anti-slip sheet adhesive 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 "shhh" 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 has a unique warmth and thickness, producing a pleasant sound despite being a distortion effect. As this is over 40 years old, please understand that it is sold as-is, with no returns or exchanges. I am also listing other vintage effectors and analog synthesizers. #distortion #effector #vacuumtube #moog