[Amps] Henry 2K4 troubleshooting

[johndtate at post.com]

I'm still getting used to replying to all and then taking out the 
individuals so it only goes to the list....

Anyway, I'm thinking the one tube developed a filament to grid/plate 
short after being keyed up and heating.  Would that someone account for 
more heat on one side of the plate and the darkened glass on one side?  
I suppose that could have been the arcing/squealing I heard.   And 
maybe that diode took way too much current before the overload relay/ 
circuit breaker could trip and then it shorted?

If this is what happened I suppose I'm looking at tube and rectifier 
replacements.  Thoughts?

73, John KX5JT