JHS Pedals Overdrive Preamp USA The JHS Overdrive Preamp faithfully recreates the highly sought-after V1 of DOD's most beloved pedal. The controls are simple: the Level control adjusts the overall output of the circuit, allowing you to cut or boost the signal. This version's LEVEL control has been modified (corrected) from the original #75 wiring to provide more volume. The Gain control adjusts the amount of gain within the overdrive circuit. Increasing the Gain pushes the input to the op-amp in the overdrive section, causing hard clipping and producing more clipping. A slider switch, not included in the original DOD 250, has also been added to the JHS Pedals Overdrive Preamp. While researching the #75 "Big Box" pedal, Josh obtained a very early Big Box unit (Non Serial) with a completely different clipping arrangement. Switching this switch allows you to try two variations: #75, which uses germanium diodes for clipping, and Non Serial, which uses silicon diodes. The Overdrive Preamp requires a DC9V-18V center-negative polarity power supply and consumes 5mA. Do not supply power exceeding DC18V. Using the wrong adapter may cause malfunction and is not covered by the warranty. Note: Due to the handmade nature of the product and the packaging materials used, there may be very minor imperfections. [Operation Confirmed] *This item was owned as part of a collection. It is being sold to organize equipment.*