I am curious about the origin of this mythology. It would be nice to see some
factual data, or, at least, logic to support it.
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. You might then
be tempted to argue that thermal stresses induced by the cooling down period
will go to work, possibly causing dangerous differential stresses. If true, the
forced air will actually accelerate such processes. Letting everything slowly
equilibriate back to ambient would clearly be less stressful of everything in
the thermal 'circuit'. What good is accomp[lished by forcing it quickly back
down to ambient (of course, in the process, it will then spend a few minutes
less time at its operating temperature - is that what this is all about).
Is there really some good physics to rely on here, or is this just another
piece of folklore that won't go away?
Eric von Valtier K8LV
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