Tube issues, 12at7 affect KT88?

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

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

Version V, newest version.

Heyraz, you are absolutly right. I am considering purchasing a tube tester.

HiFigeek, the weird thing is, only one tube runs away. I don't have the wiring schematic, but I'm guessing the first 2 AT's run the first 2 KT's, and the next 2 AT's run the next 2 KT's, with the 12AX's leading? That is what makes me think I have it narrowed down to 2 of the 4 AT's.

Tony

Hifigeek, looking at it from the side, back row is 4 KT88's.

Front row is 2 12AX, 2 12AT, 1 12AX, 2 12AT. I remember reading the first 12AX is only needed when run in stereo and not mono blocked. So I am assuming 2nd 12AX and 2 12 AT for first 2 KT's, 3rd 12AX and 3rd and 4th 12AT for last 2 KT's. But that's just a guess. It is the 2nd KT that gets hotter, which makes me think it's one of the first 2 12AT, probably the 2nd if my guess is correct.

Heyrazz, what is a DMM? Eyeballing the tubes, it appears everything looks connected.

Continued thanks,

Tony

Got it, one of those I have.

Thanks. I had the tubes tested, and the one that was in the number 2 spot tested poorly, which I think corresponds with the number 2 KT88. I did plan on replacing it because I figured it severly shortened it's life. I'm going to have them all tested just for curiosity to see the differences in numbers.

Tony