The Distortion Plus kit is a vintage distortion based in the original MXR Distortion+ that has been around for more than 40 years! It uses an operational amplifier along with two germanium diodes to produce a crunchy clipping perfect for metal. Some guitarist that use or have used it are Randy Rhoads with Ozzy Osbourne, Dave Murray of Iron Maiden and Thom Yorke of Radiohead.
The Distortion Plus has two knobs:
– Output: A main master volume
– Distortion: controls the amount of gain of the pedal
Download here the manual for the Distortion Plus Kit: