RO 12V-Pegleg Fuzz Circuit PUBLIC

Richter Original "12V-Pegleg Fuzz" Circuit With 3-Band Tone

Richter Original "12V-Pegleg Fuzz" circuit with bright and bass-boost switches, plus 3-band Fender-style tone-stack. Inspired by the preamp section of the Ampeg V3 Amplifier. Controls Include: Input Level, Drive, Bright switch, Bass-Boost switch, Fuzz enable switch, Fuzz symmetry switches, Fuzz Depth, Bass, Mid, Treble, and Volume. Uses a 12U7 dual triode (not 12AU7) space-charge preamp-tube designed for +12VDC supply-voltage on plates AND the heaters (originally provided by a car battery). Do not use any other tube (including 12AU7). The 12U7 was also engineered to sound like a 12AU7 at high-voltage, though the 12U7 is operated at 12V and has the same gain rating (mu = 20). It is available at The Tube Store. https://www.thetubestore.com . Overdriven tube distortion can be obtained by overdriving the input with a boost or overdrive stomp-box, while V1 can overdrive V1, depending on the setting of the Drive control. The diode fuzz comes from a shunt-type diode array in which symmetry switches set the harmonic content of the fuzz effect. Overall Frequency Range 20 Hz to 16 kHz. Suitable for 6/7/8-string guitar or 4/5/6-string bass. Overall Gain = +20 dB (Vo/Vi = 10). Experimental circuitry. Untested design. No simulation available. Build at own risk. Breadboard test before final soldering. Power-supply not shown. Requires a regulated single-polarity DC supply providing +12V @ >= 200 mA. Example: XP brand; model VFL05US120-US-JA. 5 Watt. DigiKey # 1470-VFL05US120-US-JA-ND. $6.20 each. https://www.digikey.com . Rackmounting recommended, with vibration damping on mounts. And use pad on tube to mitigate vibrational noise.