Problem with Mesa 20/20 ch. A, help please!

[PeeMonkey]

Hi All,

I just recently sold a Mesa 20/20, before I shipped it out it was working on both channels. However the buyer just received it and said the following

"when I was trouble shooting I also ran in mono to help isolate the problem and followed the user guide for running in mono as you stated. There's definitely something wrong with the A channel, but what, I'm not sure. When you turn the volume up to about 9 o'clock on that channel, it is distorted and doesn't get any louder as you turn it up - but it's still distorted."

There appears to be a problem with Channel A, has anyone had this problem before and might know what the problem may be? Maybe a bad tube or something?

Thanks!

 

[disassembled]

Sounds like a bad tube. Swap the tubes from channel B to channel A (even the preamp tubes)


Greg

 

[francm]

Sounds like a bad tube. Swap the tubes from channel B to channel A (even the preamp tubes)

Yup, with older tubes, that can happen in shipping (tubes going bad)