Universal Audio KNUCKLES '92 Rev F Dual Rec Amplifier PedalA watershed year for high gain amplification, 1992 introduced the double rectified monster that would unite metalheads, punks, and rockers alike with its fire breathing tone. Three decades down the line, Universal Audios Knuckles 92 Rev F Dual Rec Amplifier puts the punch of that all time classic tube head on your pedalboard. This stereo amp and cab simulation pedals Green, Orange, and Red channel voicings supply everything from the original amps