Tube issues, 12at7 affect KT88?

Did you test the 12at7's for shorts before inserting them into your system?

No I did not. I will be getting them tested. I swapped them out, seems to work fine. Put them back in, same thing, one power tube started getting very hot. It's obviously something in the 12AT's. I think I have it down to a couple of them, as I placed them back in the same order with the same results, but I'll get them all tested.

I'm not very well versed in tubes, but that was my guess, a short. It made music with no weird noises, just ran that one tube very hot. Good thing I was watching closely as they were new to me tubes, and it appears I shut it down before any damage, other than maybe shortening the life on that one tube?

Tony

Was the power tube's socket "stretched out" and not making good contact with all of the tube's pins? That's the first thing I would have checked. You should rule out the simple stuff first.

The power tubes were not moved. Only the 12AT7's. I swapped them twice, both times the Tele's ran the power tube hot, but just one. I replaced them in the same spots, so I think I have it boiled down to 2 of the 4. I was thinking about swapping them to the other channel, but don't want to press my luck. As far as I can tell, I didn't damage my speaker, and the power tube seems to be running normal with the old 12AT's back in. I will replace the power tube however, as going really hot like that probably shortened it's life compared to the others?

Thanks for the ideas, I will be getting the Tele's tested. Any other ideas? This is the first time I have encountered any issues when rolling.

Tony