Adjustable Negative feedback

[pbman1953]

From the help of Ed, I'm using a 250K pot for an adjustable Negative feedback instead of R39 (100K). When maxed the sound is very hard (harsh)  but focused. Should I decrease the pot value?

[Ed_Chambley]

Ed always uses a 100K linear with a locking nut in this type of circuit and I will bet you just used what you had on hand.  So you can either change the pot, don't turn it up high enough to make it harsh or hang a resistor across lug 1 and 3 to achieve the maximum adjustment you wish.  Your choice.

[MakerDP]

I do mine on a push-pull switching pot so it can be defeated altogether as well.

[DummyLoad]

From the help of Ed, I'm using a 250K pot for an adjustable Negative feedback instead of R39 (100K). When maxed the sound is very hard (harsh)  but focused. Should I decrease the pot value?

work around: put a 180K resistor in parallel with the 250k pot. equiv. R will be ~ 104K - close enough.

solder the 180k R from pin 1 to pin 3 of the pot.


--pete