Here's a pretty awesome take on the US Fuzz, I guess if you've built that you could flip the 2N2222A's and add a 100nF from the last 2N2222A's Base to ground. I built this today and it was not without problems, first I thought I put the 2N2222A's in the wrong way around and I didn't socket them , then it turned out I completely forgot to put in the 2M2 resistor between Q3 B & C. Once I corrected that I had serious motorboating, which was caused by a 100nF between Q3 C & Q4 B, once I put in the correct 10nF it worked.