The anode might not get hotter when the blower is turned off, but
the other parts of the tube will, as heat from the anode is
conducted into them and they no longer have the cooling effect of
the air going past them. If there's little convection because of
the airflow design, the temperature rise could be substantial and
prolonged. Maybe not to the point of threatening tube seals, but
possibly enough to degrade socket connections and/or close spaced
components.
Steve
> The anode and tube seals would not
> increase their temperature, because no elements in the tube would be a heat
> source (except the filament, which presumably is at a hotter temperature
> than the anode, but which has such a low thermal mass that its effect can be
> neglected)
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