Pro Co
Rat
Distortion
The original classic distortion that defined a category. Features aggressive clipping and tight low-end response.
The RAT established one of the most important distortion circuits in effects history. The original design from 1978 created a new category of distortion between overdrive and fuzz. The LM308 chip-based clipping produces harmonically rich distortion that works across genres.
The filter control shapes the tone from thick to cutting. The circuit became a studio standard for guitars and even bass. The rough, immediate character suits punk, alternative, and countless other styles.
Pro Co created the RAT as a definitive distortion voice. The influence on subsequent distortion designs remains immense.
Used By
David Gilmour — Used ProCo Rat as part of his extensive Pink Floyd pedalboard setup
Jeff Beck — Famous for using Pro-Co Rat distortion in the 1980s before switching to Klon Centaur
Kurt Cobain — Used ProCo Rat as part of Nirvana's pedalboard alongside Boss DS-1 and Small Clone
Reverb
Amazon
