GALLERY: L.A. Amp Show 2012

When Japanese engineer Susumu Tamura designed the Maxon OD808 overdrive, he could hardly have known that it and its export twin, the Ibanez TS808 Tube Screamer, would become perhaps the most influential and, probably, imitated pedals in stomp box history. In fact, upon its introduction in 1979, the Tube Screamer, whose smooth sound is characterized by a bass roll off, midrange bump, and slight high-end attenuation, was not an instant success. But as the pedal was adopted by players as disparate as Stevie Ray Vaughan and Kirk Hammett, it gradually became a ubiquitous presence on pedalboards of all persuasions.