RO 12V-DumbBunny Fuzz Circuit PUBLIC

Richter Original "12V-DumbBunny Fuzz" With 2-Band Tone

Richter Original "12V-DumbBunny Fuzz" circuit, with Bright switch and 2-band tone. Inspired by the preamp section of a Dumble guitar-amp. Controls Include: Input Level, Drive, Bass, Center, Treble, Bright switch, Fuzz enable switch, Fuzz symmetry switches, Fuzz Depth, and master Volume. Uses a 12U7 twin-triode preamp-tube (not a 12AU7) designed to work with +12VDC supply-voltage on plates AND heaters. Also engineered to sound like a 12AU7 at high-voltage, though the 12U7 is at +12V (originally provided by a car battery). Do not use any other tube (including 12AU7). The 12U7 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 V2 depending on the setting of the Drive control. The diode array is used to add shunt-type diode-fuzz in which the symmetry switches set the harmonic content of the fuzz effect. Experimental circuitry. Untested design. No simulation. Frequency Range 20 Hz to 16 kHz. Overall Gain = 12.5. Power-supply not shown. Example Regulated Off-The-Shelf Supply: XP brand; model VFL05US120-Us-JA. 5 Watt. DigiKey # 1470-VFL05US120-US-JA-ND. $6.20 each. https://www.digikey.com .