9V DC

9V DC is a standard power voltage used by many guitar pedals, often with a center-negative connector¹². Sources describe it as an industry-standard supply for effects such as the Mu-Tron Mini Mu and Micro-Tron IV³⁴, and pedals like the Maxon OD-9 can run on a 9V DC power supply⁵. Some manufacturers specify current requirements, such as 9VDC at a minimum of 300mA for Strymon pedals² or 200mA for the Carl Martin Andy Timmons Signature Compressor/Limiter⁶. Boss-type 9V DC is cited as the standard for pedals like the Tech 21 Bass Compactor and Vox Cooltron Snake Charmer⁷⁸. On some pedals, such as the Diamond Vibrato, powering at 9V DC instead of 18V DC changes the sound, adding more color and warble⁹.