so i built the General Guitar Gadgets tubescreamer clone with the Keeley mods, 3 diodes, and a 1m drive pot.
i used 2n3904 transistors and a lf353p ic.
C11 is a tant, all the rest are elec or film. 1uf are NP.
im currently getting a high pitched ossilation noise no matter what the knobs, or switch are at. the frequency of the ossilation does change when i turn the knobs or change the clipping, but doesnt ever go away.
voltages of the ic
1:4.7
2:4.7
3:4.7
4:0
5:4.7
6:4.7
7:4.7
8:9
and trannys
1:
Col:9.5
Em:3.6
Base:4
2:
Col:9.5
Em:3.6
Base:4
funny thing is that i made another overdrive pedal yesterday and it does the exact same thing. is it a grounding issue?
checked all the cap's and resistors and none of them are bad..
thanks