[Milsurplus] Re-attaching vacuum tube envelops to their bases

[Schreiber, Patrick]

This is probably a topic that has been hashed and rehashed, and if
addressing it off line is best, OK  
My question is: What is the best way to re-secure the tube envelope to
the base when the glue joint fails. I have several 801-A's and a couple
of #10 power triodes that test good except for the base, as they are
higher power triodes that will run hotter than most tubes.  So, can
anyone recommend the proper glue that will work but not deteriorate due
to the heat?
Any assistance will be appreciated!
 
Thanks
 
Patrick Schreiber