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 popular 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.

This unit has a few scratches but is overall in good condition.

This unit does not come with a bag or case and does not include a power supply.

This unit has been tested and is in working order.