[Amps] Air temps leaving the amp.

[Bill Turner]

The important measurement is not exiting air temperature, but rather the 
temperature of the ceramic to metal seal on the tube, which should not 
exceed 250 C for that tube.

You should get some color-changing paint or crayon from McMaster-Carr or 
a similar source. Mark the seal with the 250 C paint and see if it 
changes color under full load. If it doesn't, you are safe. After you 
know you are safe, you can monitor the exit air temperature at full load 
and know that as long as you are under that figure, all is well.

73, Bill W6WRT