RFlabnotes@aol.com wrote:
My simple-minded physical reasoning says that when the power is all removed,
there can be no additional heat-rise. So, at least the filament for a short
time is no better or worse off than during steady-state standby.
At least in the case of glass tubes like the 3-500Z, the problem is the
filament seals. After turning the filament and blower off, heat is
conducted from the still-hot filament supports to the glass-metal seals,
which are now not being cooled by the blower. So the seal temperature
rises.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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