Sunn Buzz

Basically this was Sunn Amplifiers take on the Maestro FZ-1A, but with Silicon transistors instead of Germanium. Best description I found of the tone was this.

Depending on the setting of the effect control, it can go from classic "fuzz face" sounds and beyond - achieving the sustain of a big muff. It's a three stage, high gain, low voltage solid state amplifier circuit.

I was unable to to find any videos of it, but as soon as I saw the words Sunn and Fuzz together I knew I had to take a crack at this pedal.

The circuit runs off of +1.5V, just like the FZ-1A. The problem with this is that we would need either a dedicated power supply or run it off a AA battery, and you wouldn't be able to wire up an indicator LED. So what I've done is made a board for the original, and did some digging to see how to get +1.5V from a +9V source.

What I found was that using an LM317 regulator you can get the voltage down to +1.5V with the right resistors. After doing some calculations with the regulator board you should get +1.516V. If my calculations are right, that means you can run it just like any other pedal and have an indicator LED.

Original:

With Regulator:

Sunn Beta Preamp

This is a single channel version of Sunn Beta Bass & Lead Preamps.
You can find the original FSB thread here.
There are two different sets of caps depending on which version you want to build.

You could use Mark's Bipolar Voltage Converter if you want:
http://tagboardeffects.blogspot.fr/2014/01/bipolar-voltage-converter.html

You could also use this external board to wire a Bass/Lead Switch instead of using fixed caps:

(20/H, 19/C, 22/J.. are board's points coordinates where C1-4 should be placed)

If you want to build the original A/B Channels version just build 2 identical circuits and connect their outputs to the daughterboad below