Supro Drive Pedal Emulates a Class-A Supro amp from end to end Achieves magnetic saturation via output transformer Switchable RICH or BOLD transformer windings selection Expression pedal control for GAIN Accepts standard 2.1mm neg. tip power supply Runs on 9V battery (included) Pedal size: 12cm x 6.5cm x 6.5cm Current Draw below 20mA Original circuit design by Thomas Elliott No other pedal sounds more like a real Supro amp than the Supro Drive This groundbreaking analog pedal re-creates the circuitry of a Supro amp, from end to end, including an actual output transformer As the Supro sound has gained widespread popular recognition as a pillar of classic rock guitar tone, numerous amp and pedal companies claim to have captured our coveted sound by cloning the original Supro preamp, in stompbox format They all got it wrong! The real tone of a genuine Supro amp has everything to do with the unique phase inverter design, Class A power amp section and the magnetic saturation that occurs via the old-school transformers found in these vintage tone machines