Woody wrote
Not positve what resistors to change to bias. 6k8 4k7 to1m 100k?
Most often people will adjust the 4k7 attached to the positive rail. Sometimes people will adjust the other 4k7 as well. I recommend you temporarily replace the 4k7 attached to the positive rail with lugs 1 and 2 of a 10k pot. Then adjust the pot until you get what you like, measure the resistance between lugs 1 and 2, and use a fixed resistor that matches that value. This assumes you have DMM. People tend to have their own preferences for their favorite bias, but the usual advice is either to search for 1/2 the supply voltage, or just use your ear. Biasing hot or cold will have specific tonal impact (ripping velcro vs. harder distortion).
Woody wrote
As the circuit is now it is noisy, sustaining forever, overdrive,fuzz. I tried differnt value of volume pots. I also removed the eq circuit and put a volume contol trying to tame it. I was hoping this would be closer to a dual lpb. Then I would run an eq after that. The eq that was on it worked but was too much with the cicuit as is. I did try that eq on my c945 lpb2 clone it sounded nice of the few I tried it does lower the ouput a bit but maybe not as much as the others. Thank you.
This circuit is nearly identical in topology to a Fuzz Face with the Fuzz knob turned all the way up. The values of almost every component are different, so I don't know exactly how it should sound, but it's probably pretty far from two boosters in a row, if that's what you're looking for. It's not really a booster at all, much less a clean booster. It's a fuzz.
Fuzz Faces are pretty idiosyncratic, and have some best practices associated with them. The internet is full of info if you search for it. But a good start is R.G. Keen's classic
article.
A few things to consider.
1. There's no power noise rejection. A battery or a well-regulated power supply is a must. It will often be too noisy to use otherwise.
2. It wants to be first in the chain. Your pickups are actually part of the Fuzz Face circuit. It will sound drastically different with a buffer or another active pedal between the guitar and the FF, or with active pickups.
3. It's really responsive to guitar volume knob, assuming it's first in the chain. This is how most people set the fuzz level, and why many FF pedals don't even include a Fuzz pot. With your guitar turned all the way up, it's filthy fuzz. Drop the guitar's volume knob even a little bit and it cleans up a lot without getting much quieter. At the lower end of the guitar's volume knob, it will be nearly clean. This effect depends on the bias. With better cleanup when the collector is at about 1/2 the supply voltage.
4. They're usually not super loud. Often they're even below unity. But this version has the output coming directly off of the collector of Q2 instead of being cut down by voltage divider between the collector and the positive rail, so I imagine it's pretty loud.
Hope this helps.
Locked
