BLAMMO! Electronics Voltage BoosterMaker: BLAMMO! Electronics Model: Voltage Booster Condition: New Description: The Colorsound Power Boost was one of the first overdrive circuits to hit the pedal market. Originally created around 1968 by Gary Hurst, it offered players a wide range of useable guitar sounds with its simple 3 transistor pre amp design and 2 band Baxandall EQ. The first units ran on 18 volts offering a more open and dynamic tone than the later models, which ran at 9. The