MXR Distortion +

The MXR Distortion + ("Distortion Plus") is a distortion pedal originally designed in the 1970s by MXR Innovations. As its name implies "distortion," it's a 'distortion' (parallel clipping) but has a rather mild sound. It has been cloned many times, most famously by the DOD 250 Overdrive (a distortion). The pedal uses a single op-amp and a pair of germanium diodes to ground (parallel-push) for clipping in a very simple configuration with only Output and Distortion controls, no tone control; the pedal uses no discrete transistors. Turning up the Distortion control increases the amount of distortion and at the same time boosts the treble in the signal.[1]

An original MXR Innovations distortion plus pedal from 1979, block logo, without LED and battery-only operation (no AC Adapter).
MXR Distortion + on a guitar pedalboard. Distortion + is the yellow unit on front of the pedalboard.

This pedal is perhaps best known for its crunchy heavy metal sound that was featured by Randy Rhoads in his work with Ozzy Osbourne.[2] Jerry Garcia of the Grateful Dead used this pedal exclusively for distortion in the late 1970s.[2] Bob Mould of Hüsker Dü also used the Distortion + as part of his trademark guitar sound.[3] Dave Murray of Iron Maiden has used Distortion + since the early 1980s.[4] Thom Yorke of Radiohead has included the Distortion + for many of his signature distortion sounds, using a variety of guitars to achieve various tonal options. Rowland S. Howard (The Birthday Party/These Immortal Souls/Crime & the City Solution/Solo albums) also used this pedal across his career.

References
  1. "ElectroSmash - MXR Distortion + Circuit Analysis". www.electrosmash.com. Retrieved 2020-01-17.
  2. Gill, Chris. "Out of the Box: Guitar World Celebrates the Time-Honored History of MXR Effect Pedals". Guitar World. Future plc. Retrieved 2018-07-31.
  3. Cochran, Kevin. "Gear Blog: Bob Mould". Austin City Limits. KLRU-TV, Austin PBS. Retrieved 2018-08-01.
  4. Bosso, Joe. "Iron Maiden: Out of Thin Air". Premier Guitar. Premier Guitar Magazine. p. 2. Retrieved 2018-07-31.
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