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Decided to build an old classic fuzz pedal, the Sola Sound Tone Bender MK1. It's a very easy low component build, but it is a very difficult fuzz pedal to get the right sound as it is very selective on what germanium transistor to use and what gain, leakage value is used. Small Bear happens to sell a set of matched PNP germanium transistor for the Tone Bender MK1 and was used for this tone bender MK1 breadboard project. When building this great fuzz pedal, I highly suggest breadboarding it first to test out the transistors then finish the build on a strip-board to complete the project. There are very helpful tips over at www.diystompboxes.com to help you out. I have never played the original 1965 Tone bender MK1, so I made this video to post online to confirm if the sound is true to the original or at least close to it. The Tone bender MK1 has a much more organic, spiky and higher end sound compared to the Tone Bender MK2 Pro from what I have read.
Here are the voltage readings I have on the breadboard: Source: 9.38v
Transistor set from Small Bear.
Q1: 75 hfe, L83, Q2: 106 hfe, L113, Q3: 140 hfe, L157.
Fuzz at max:
Q1:
C= 0.00v
B= -8.51v
E= -8.97v
Q2:
C= -3.89
B= -9.19
E= -9.36
Q3:
C= -0.15
B= -9.34
E= -9.25
Fuzz set to min:
Q1:
C= 0.00v
B= -8.53v
E= -8.94v
Q2:
C= -0.03mv
B= -9.32v
E= -9.35v
Q3:
C= -0.10mv
B= -9.33v
E= -9.35v
I was using a 2010 Gibson Les Paul Junior with P90 pickups and a stock 2007 Fender Blues Jr for this video.