Tubescreamer Oscilation

[Rawkcraze]

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
just to add to this, it also has this high pitched noise when its bypasses. so somethings obviously going through the ground or something.
and alsoand just to add, when my guitar volume is all the way down, theres no ossilation at all. redid all the grounding the exact way GGG says to and it still does the same thing. im not getting any squealing at low volumes, but it still gets bad after 1/2 way.. any ideas?

[daverdave]

What are you powering this off? Power supply or batteries?

9.5V on the collectors seems to indicate you're using a power supply, but the opamp voltage is 9 exactly.
If it's a power supply, try it with batteries or a different power supply to ensure it's no issue with the supply.

[bacanador]

Something similar happened to me once

But I was building the Tube Screamer on a perfboard, I missed the 47uf capacitor in parallel with the 10K for the power supply voltage divider. Once I figured that out I put the 47uf and the oscillation was gone. In the GGG circuit it is C7, so I would check C7 and C12, and figure out why you have a voltage drop of .5 volts between the collectors of the transistors pin 8 of the opamp chip