Marshall JMP1 Preamp Clean Channel problem

[COLMMCSHERRY]

My friends marshall jmp1 preamp developed a problem in the clean channel, one day it started to distort, It seems to have one tube for clean sounds and one for dirty sounds.... When the dirty sound tube was out the cleans was fine again so i thought it was bleed for the dirty channel, now even with the dirty channel tube removed, the clean channel distorts.... i have changed tubes checked the sockets etc... but cant track the problem down...


Here is the schematic http://www.drtube.com/schematics/mar...jmp1-61-04.pdf


if someone could point me in the right direction, i suspect a op-amp or cap....

Thanks for any help infos....

Colm

[COLMMCSHERRY]

Anybody?

[Chuck H]

Your link isn't working.

[COLMMCSHERRY]

Hi Chuck, you are right.... this is the working link, and thanks.....

http://www.drtube.com/schematics/mar...jmp1-61-04.pdf