The Reverb product line evolved from the Hammond Organ Company, where the Reverb was originally used in organs. The company later began marketing the unit to amplifier manufacturers. In 1962, Leo Fender, introduced what was then called the "Hammond Reverb", in Fender's, now legendary, "Twin Reverb" amp. This established reverb in guitar amps from that time forward. In 1971, Hammond Organ moved Reverb production to its Accutronics division located in Geneva IL. Slowly the "Hammond Reverb" became known as the "Accutronics Reverb".