I just perfed this one and am waiting for a box. Can't wait, the breadboarded version was great and really loud. I tried a couple of different tone controls but left them out and socketed the in and out caps, and transistors, as well. A great fuzz, maybe my favorite so far....
Anything you would use to boost a fuzz face can be used here but honestly why would you. There is already a ton of volume and a ridiculous amount of gain. Its a mushy pedal already and youre only going to get mushier by boosting.
Check out freq central's post about adding a BMP tone with the recovery stage at the end of the One Knob. His clip is pretty great. Tried a version of it when I had it up on the breadboard but got too impatient and wanted to get it on perf. Playing around with different transistors is really fun with this circuit. I put a random mitsubishi metal transistor in Q2 and tied the emitter directly to ground and got a nice gain boost, although this circuit does not need any more gain!
Rangemaster type booster. Why? Because the treble boost will keep the tone clean and not flubby/faty/gross. Boosted fuzz faces sound great. The One knob is pretty much a fuzz face.
The Omega boost at ROG is a great one, variable frequency boost as well for variation in fatness. Do it!
Please report back if you decide on the boost. I would love to hear it, maybe I'll try some of John's suggestions. What transistors did you use for yours?
Alright, I was on the fence too long on this one so I just boxed up the original circuit and popped my trusty dusty Rangemaster--my first build-- in front of it. I used transistors measuring 90 hfe and 140 hfe, and it is pretty versatile as is, but mooshy like I remembered. With the RM: HOLY CRAP! Insta-tonebender! Cleans up really nice with the guit volume when the rangemaster is on, and even stays pretty clear when a bigger (Iommi-sized) input cap in on. It is strangely MORE focused than the original COKF, too, and less fizzzzzy. Now I need an NPN rangemaster so I can box it together...
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