help troubleshooting gradually distorting tube amp (dropping b+ voltage when hot)

[Jim McShane]

Originally Posted by diblet

@DF96 i agree that the tubes look okay, but there is a little brown residue at the top and bottom that i don't see in any of the other tubes. maybe it is just being caught early enough were it isn't too bad at this point.

That's normal discoloration, it doesn't indicate anything other than some use and therefore a bit of getter flash erosion. And it's VERY common on Sylvania made tubes, which is what those are.

[diblet]

Originally Posted by bob91343

Diblet, I gave you the answer on AudioKarma. Two bad capacitors.

yeah, i appreciate it. i posted on both forums yesterday - cool to see everyone brought up the similar issues.

[diblet]

Originally Posted by Jim McShane

That's normal discoloration, it doesn't indicate anything other than some use and therefore a bit of getter flash erosion. And it's VERY common on Sylvania made tubes, which is what those are.

ah thanks, that is good to know