Hi, I have a Cornell reissue Fuzz Face (which has been modded by AnalogMan, truly the best), he actually installed one of his SunFace boards inside with NKT275 Transistors. The Fuzz has a 2k2 Fuzz pot. The original fuzz face has a 1K pot.
What will be the difference if I change the pot to 1K? I have bought also at smallbear a pot that is reverse audio. What's the meaning of that and how will it affect the sound (1K reverse audio)?
Best regards
Hit this link... should answer you questions pretty damn well!
http://www.geofex.com/Article_Folders/potsecrets/potscret.htm
thanks,
matt
I used a SB 1k FF gainpot, 'bumped up' to 1k8 or so, this introduce more resistance between ground and the feedback loop, 'indexing' the gain settings up, lowest and highest gain settings are both 'up', I don't use really low gain setting on a FF anyway.
2k2pot will adjust to higher gain than 1kpot, or 'allow settings which shunt less signal to ground'.
The fuzz pot serves two functions, not just one. On the one hand, a larger pot should give you 'more' gain. But on the other hand, a larger pot adds more resistance to the emitter of the transistor, biasing it into a lower-gain operating point. Taken together, I would think the mod makes the fuzzface a bit more stable, less prone to oscillation and high noise levels. ???
something like this?
http://www.geocities.com/j4_student/diaz.gif
http://www.geocities.com/j4_student/schematics.htm
I can only speak from personal knowledge about the standard Fuzz Face circuit. The 1K linear pot that was standard issue for this design put almost all the "action" into the last 10% of the rotation. The reverse audio pot spreads out the change in clipping level over much more of the rotation. You get a lot more subtlety of control.
The 1k "C" taper is great.
0k - 1k adjustable is 'correct' for FF, this dials in nice wide gain range, the SB 1k FF pot is quite 'smooth' and even, not bunching up 90% of the control into the last 5%-10% of the CCW rotation.
For lower gain transistors or other modifications, greater than 1k 'total' [ie adding say an 820 ohm or 1k resistor between gainpot and ground as stop resistor] still allows very low and higher gain settings [the range bumped up with an 820ohm from 0k-1k available to .82k - 1k8].
Quote from: petemoore on February 05, 2007, 11:06:08 AM
I used a SB 1k FF gainpot, 'bumped up' to 1k8 or so, this introduce more resistance between ground and the feedback loop, 'indexing' the gain settings up, lowest and highest gain settings are both 'up', I don't use really low gain setting on a FF anyway.
2k2pot will adjust to higher gain than 1kpot, or 'allow settings which shunt less signal to ground'.
what do you mean bumped?