I discovered this recently while search for any information regarding said topic. Looks very 'PlexTone'-ish in terms of the schematic; Quad op-amp (LM347) running off a +/- 9 volt dual power supply; Hi-Low switch allows you to swap between Red LEDs or BAT46s in terms of clipping diodes.
Courtesy of Pedal PCB:
https://www.pedalpcb.com/docs/KingMidas.pdf
~ Fuzz.
Keeley El Rey Dorado
- FuzzMonkey
- Breadboard Brother
- FuzzMonkey
- Breadboard Brother
Thanks for the link.