Boss SD-1. SOLD!

SUPERB CONDITION. View to believe, mine comes with JRC4558DD!
The SD-1 has been around for a very long time and has gone almost unchanged from its conseption 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.

The OD-1 didn't have a tone control so the engineers felt that the tonal range was limited because of this. As an answer to the problem they came up with the SD-1. Comparing the two circuits reveals that they are very closely related and using the exact same overdrive circuit. When comparing the sound of the two pedals side by side, it is however obvious that they're not identical. Opinions are divided when it comes to the question, which one sounds best, but there is no doubt that they're both legendary overdrive pedals.