The Distortion Booster schematic is essentially this with no supply cap,
Electro Harmonix - Two transistor Muff Fuzz:
I'm not sure about the pot value, 47k linear is very likely (as used on other models).
Transistors in that series of pedals were 2SC828. Most pedals used 2SC828Q but in the back of my mind
one of those pedals had 2SC828R or 2SC828Y and it might have been that one.
Maxon and Ibanez had the same series of "pedals":
Maxon MB10 Ibanez No.85 Distortion Booster
Maxon MB20 Ibanez No.86 Power Booster
Maxon MB30 Ibanez No.87 Treble Booster
Maxon MB40 Ibanez No.88 Bass Booster
The Treble Booster and Bass Booster were just a single NPN transistor stage:
470k + 47k base resisistors, 10k collector resistor 390R emitter resistor.
They varied in that the Treble Booster had small coupling caps and Bass Booster had large coupling
caps and some extra low-pass caps on the input and output.
I can't remember the Power booster.
The pedal loads the pickup in bypass and the power is cut off which means you get a large "bang" when you change modes.
The pedals were very similar to the Electro Harmonix Screaming Tree/Screaming Bird/Hog's Foot (Mole) era of pedals.
I'm just quoting from memory here. I have better notes in my archives.
