Modified Elliott Preamp PUBLIC

Modified '02 Elliott Mk II Preamp

Guitar preamp circuit based on the op-amp preamp for the 100W Guitar Amplifier Mk II by Rod Elliott. See the original circuit here. https://sound-au.com/project27.htm Modifications are; changes in part-values to increase gain and to obtain a preferred frequency response curve, along with changes to the diode array. Controls Include: Bass, Mid, Treble, Stack Sum, Gain, Fuzz enable switch, Fuzz symmetry switches (two, with 2 settings each), Fuzz Depth, and Volume. Range at or above 0 dBV is from 48 Hz to 14 kHz. Ideal for 6/7-string guitar in standard tuning. [Not suitable for 8-string guitar or bass.] Maximum gain = +19.6 dBV (Vo/Vi = 9.6) @ 400 Hz with all controls at 50%, or +40.7 dBV (Vo/Vi = 108) @ 630 Hz with all controls at 100%. Power-supply not shown. Requires a regulated dual-polarity supply providing +-9VDC or +-12VDC or +-15VDC at >= 20 mA of current. And while the circuit is based on a proven design, plus being simulator verified, treat it as experimental in nature. Breadboard test it before committing to a soldered build.