Schaller Fuzz Sustain

An old fuzztone from West Germany which was housed in a wah shell. The treadle controlled the amount of fuzz and clean signal through a dual gang pot. There was an internal 22k trimmer which controlled the amount of gain.
Built it stock which works fine but it needed some improvements like higher output level and the internal trimpot was changed to an external gain control. Increased the value to 100k for more gain. Stock units had BC413C and BC239C transistors which is fairly high gain general purpose silicon transistors so BC549C's and 2N5088's should work equally good.

Schematic.

 

Stock circuit

 

Modified circuit

Morley D1B Distortion

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