Tone bender 

Schematic
Passives
Actives
Box
Potentiometers
100K Log Audio Taper
1k Linear Taper
Audio Jacks



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This is probably one of the most legendary fuzz pedals that has ever existed, and for good reason too! This thing can produce some completely saturated fuzz that is capable of slipping into feedback easily if you crank it up loud enough. I just can't say enough about this pedal. This is, without a doubt, my all-time favorite fuzzer. It's a genuine kick in the teeth that will have a permanent spot in my setup. Supposedely, this is the fuzz pedal that Jimmy Page used on the first couple of Led Zeppelin albums, which makes it even more famous. Below is a picture of the circuit board in a ToneBender MKII. Note the silver Mullard OC81D transistors:

uning and Tweaking the Original Sola Sound MKII PNP Circuit
There are a lot of schematics on the internet that don't have the 0.01�F capacitor on the input jack side of the input capacitor, but in the original ToneBender MKIIs, there was one there. This capacitor helps to get rid of some of the intense treble that this circuit has without it. I would recommend that you replace the 8K2 resistor on the collector of Q3 with a 20K trimpot which will allow you to adjust Q3s collector voltage to -4.5VDC. I would also add a pulldown resistor to the input of the circuit and a reverse polarity protection diode to help protect those expensive Germanium transistors. Another nice tweak is to replace the 470-ohm resistor in the original circuit with a 1K or 1K2, which will boost the available output quite a bit. The original OC81D transistors will be very hard to find...and very expensive if you do find them. In all reality, they aren't any better sounding than other types, such as OC44, OC75, 2N404, 2N508, 2N527, etc. The transistor gains for the MKII should be something like 70 for Q1 and Q2 and 100 for Q3. The gains don't have to be exact, but it helps for them to be close to these values. ***These tweaks are included on the ToneBender MKII Professional PCB and Layout at the bottom of the page, but they are optional.***