carvin x100b reoccuring issue... heat related?

[methodofcontrol]

Which begs the question: "Why are they getting so hot?"

that's exactly where i'm at.

what if the cab wiring were somehow screwed up? could a constant or fluctuating impedance mismatch cause tubes to get that hot?
i can open up the cab next time i'm near it to check wiring and impedance, but otherwise not sure how to proceed... suggestions?

[The Dude]

Have you checked bias for each tube? Do you have a bias probe? That is where I would start. You seemingly have a current issue, so let's find out what the idle current actually is for each tube.

[Jazz P Bass]

I forgot what is needing fixing

If the 5 watt screen resistors are getting too hot, then either the bias is too hot (see The Dude's post above) or you have a bad tube.
Really, the only time they should get 'hot' is when you are pushing the amp hard.