P.U.R.P is a Pump’d Up Rangemaster Plus PCB that is a revision of the vintage Rangemaster circuit. It can be used in series with other negative-ground pedals using a Negative Tip Supply. The “Plus” in the name refers to the modern mods included in the PCB. It has a switch that allows you to choose between Classic Treble Boost, High & Mid Boost, or Full Range Boost. It also has Bias adjustment and Grit adjustment trimmers.

The PCB includes a charge pump, which enables the use of vintage PNP Germanium or Silicon transistors while still sharing power with other negative-ground pedals. It can also be combined with another circuit in the same enclosure and share a power source.

The original Rangemaster was a treble booster, and this build incorporates three different tonal selections. The first setting provides the classic Rangemaster treble boost. The second setting boosts highs and mids, while the third setting boosts the full tonal range of a guitar, known as the “band pass” setting.

While many people search for Germanium PNP transistors, the PCB has found that Silicon transistors also work well in this circuit, providing great sound and increased reliability.

Summary created by AI from the original source.