Too much highs on reissue Ibanez Tube Screamer?????

[AC30Dirty]

hey guys, i recently gutted a reissue tube screamer an replaced in a hammond box. While it was out i decided to do a few mods as well. I did the 808 mod and swapped out the chip and did the whole less/more gain and better bass response as well. I noticed though that the tone control is not very responsive. The only setting that sounds good is at zero. As soon as I start to turn it up a little the highs get really shrill sounding. I bought the pedal at a pawn sop and i tried it before i did anything to it and the highs sounded the same; so i don't think it has to do with anything i modded. Everything else sounds great though, except for that. Do you guys have any idea as to what it could be? Thanks

[MartyMart]

Make sure the tone cap .22uf and cap between pin 1/5 to ground .22uf  ... have not been serverely
reduced ?
I use a .068uf for the second one above, for a brighter "spanky" tone.

MM

[AC30Dirty]

Let me check.....

[AC30Dirty]

Hey Marty, thanks for the feedback. I kept the cap u described in ur post the same as stock; i just made it metal film. its a .22uf. I could higher the value although i've never had to on previous TS9's i've modded. I usually like it at this value. I put the IC that came in the pedal into an SD-1 i had here just to make sure the IC wasn't the cause of the problem; and the pedal wouldn't work. So, i took it out and put the good IC back in and the pedal worked fine. Could it be possible that the IC that came in the TS9 i bought was going bad and messed up another compnent in the circuit thats causing this problem?

[MartyMart]

I doubt that, I have had a few old pedals where the IC has gone bad, or been damaged by someone else
using the wrong PSU , this could be the case with your's .
So, working now but still way to bright ... yes ?
RG helped me out recently on an '808 repair, traced the 4.5v line and that showed the IC to be bad.
I would suggest getting out your DMM and an audio probe, perhaps you'll find the point where it
sounds bad ?

MM.