Would you still use these tubes, or are they cooked?

[DASchell]

USA Tube Audio

[DCikes88]

The cat smells the RAT.

[Securb]

Sadly, all four are dead. Two wouldn't even light up.

[JMP/HBE]

looks like the mica is burnt not good.
Yeah trying to diagnose & fix peoples vacuum tubes on the internet might as well be trying to heal their cancer too just doesn't really work.