The SD-1 has been around for a very long time and has gone almost unchanged from its conception back in 1981. The pedal contains an asymmetric overdrive circuit that responds very well to the player’s picking force. It produces a dynamic and smooth overdrive effect well suited to any type of rock music. The SD-1 is also poular as a booster pedal for valve amplifiers. Turn the distortion down and the level up and connect it in front of the amplifier. The higher input level will push the input valve of the amplifier harder producing more distortion from the amp itself. The SD-1 is well suited to do this because it maintains the natural tone from the guitar.

Pedal was built in May 1984, has considerable chips in finish and is missing 2 knobs