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I've played around with every version quite a bit and I dunno if I have a favorite. I like them all for different reasons, they're all unique and I grab whichever one I want for a particular sound. I like fuzz that is really rich in texture.. the two that I think I probably grab the most are my DAM FZ-678 and a Vox TB clone that I built. The DAM is kinda smokey and smooth, the Vox is buzzy and raspy
Anyway with the MKII you should first identify if you're planning on building the OC75 or the OC81D version. The resistor values are different and depending on your transistor selection one will be a lot easier than the other. If you have leakier transistors, do the OC75. Lower leakage do the OC81D.
Try not to look at it like a Fuzz Face. I don't do trimmers but I don't do them with the Fuzz Face either so keep in mind I'm kindof just not a trimmer guy if I can avoid it. The bias pot is not particularly helpful with the MKII, especially if you implement it on Q3 collector as most people do. It's much more effective with Q2, but I still don't do it personally.
With that said Q2 tends to be the most important one in the MKII. What I usually do is plug in the breadboard that I have dedicated to MKII transistor selection.. start with a ballpark hfe selected trio of transistors and listen to it. I listen for noise, gating, any weird attack or decay behavior. If it's noisy, generally you're gonna back off on Q1 and/or Q2 hfe. If it's gated I go for higher hfe. Once I get it sounding really badass, I will try a few different transistors just to see if it gets any better. Sometimes it does, if not, I go back to the 3 that sounded best.
Some transistors just don't wanna sound good in the circuit at all. You gotta accept that and experiment with different things. Don't be afraid to color outside the lines. The doctors recommended hfe values mean nothing, it can be a good starting point, but it's not a rule, nor is it necessarily representative of an actual original unit.
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