Founded by Mike Matthews in 1968, Electro-Harmonix has a long history of building quality effects pedals and being pioneers in the industry. Originally building a pedal for Guild called the "Foxey Lady," EH eventually produced the much-celebrated "Big Muff Pi" fuzz pedal, which is still in production today. Other popular Electro-Harmonix effects include the Small Stone phaser, Small Clone chorus, Deluxe Electric Mistress flanger. Another Electro-Harmonix trademark is combination effects, such as the Deluxe Memory Man which combines delay, chorus, and vibrato (and is a favorite of The Edge of U2).
Currently, Electro-Harmonix makes a wide variety of effects pedals, including reissues of their older designs as well as newer models such as the Micro and Nano line, which are smaller pedals dedicated to single high-quality effects. Electro-Harmonix even makes pedal-sized guitar amplifiers, the 22 Caliber and 44 Magnum.