Pedal that has been inspired by the classic sounds of the Dumble amplifiers of the late 1970s. The pedal features four controls for Gain, Volume, Depth and Tone. To offer more headroom, the pedal can be operated with 9 volts as well as with 18 volts. Dumble Silverface amp owners includes Stevie Ray Vaughan, Jackson Browne, Carlos Santana and many more.