21FJP22 dud keep or toss?

[Eric H]

Johnny,

This tube was a grade B rebuilt tube that was pulled from a set, probably around 1981 as that is the date on the carton it's in, it's got plenty of use on it considering the amount of black dust accumulated n it.

The heater works but the gun is dead, I tried rejuvenating but it didn't do anything, I suspect it has an open element inside, the blue and green are OK so it's under good vaccum, I wouldn't hope for much with it short of having it rebuilt.

I have a factory carton that I have used before, it's a little dog eared but should work.