Fender Twin Amp Jumping Channels

[Clearfield School of Music]

HELP! I have a Fender Twin amp that jumps from the clean channel to the gain channel on its own??? It most times switches back but sometimes just stays on the gain channel???? HELP!!! Thanks

[mikeboone]

What model/year of Twin do you have?

[Johnny Creeper]

Not sure if it's anything like this, but heres one from a while ago;

http://music-electronics-forum.com/t11734/

Hope I've copied that in right, not quite sure how to link the thread correctly....

Thanks,

Johnny Creeper

[Clearfield School of Music]

Thanks for the fender tube amp help creeper

Thanks for the great reply to my post, I'll try it tomorrow.

[rene2k]

Hi m8,
don´t know wether your problem persists....if so I have a solution for you which I found on my own w/o any technician.
When you´re looking inside that amp you´ll see 3 or 4 PCB´s. The front pcb is connected with a PCB in the middle and goes from there to another PCB for footswitch jack and so on in the back. These 3 PCB´s are connected via a flat ribbon cable. Unmount the PCB in the middle (carefully) and try to turn it upside down. Then you´ll see the solder joints for that ribbon cables. On my amp one of these solder joints gone bad and causes that switching between the channels. Resolder the whole thing or try to look which one´s gone bad. This should be the solution for your problem.

regards
rene