[NJARC] Got a Flashy 5Y3...why?...

[sgt88 at atlanticbb.net]

Finished up my 'full' restoration on the Philco 37-620...wood, chassis..and 
polished nuts....it even works...after alllll that!!!

Had used my Philco 116 during the DX contest...it smoked for a few minutes 
from under the chassis...couldn't find the exact spot...it stopped by 
itself...sooooo I continued listening in...and finished the log.

Just put it back on the bench...plugged it in...my 5Y3 started 
flashing...like a ligthning storm inside the glass...shut it down real 
quick.

Soooooooooo...is it the tube??....or 'something' else???...causing this?

Tnx,
Steve T.