Sunday, 31 January 2016

Ace Tone FM-3 Fuzz Master

   Another Japanese Big Muff variant, this one has some substantial modifications. This has a footswitch to select between boost or fuzz, but you can't use both at the same time. The boost mode has it's own volume and tone pots. There are also other differences in biasing, filtering, as well as the location of the volume pot (in this circuit it is moved pre Q4) making this an interesting take on the Big Muff.


  1. what nomenclature is the boost switch. I see it DP??. On/On, On/Off, On/Off/On, On/On/On.

  2. Oops. That would be good to know. It is a DPDT footswitch, I've updated the layout.

    Keep in mind this isn't a boost that stacks on top of the fuzz, you get either fuzz or boost. Not both

  3. This is now verified. Awesome pedal