Filaments move when they get hot from expansion that means the filament could
open up when hot. Rare but I suppose possible.
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On Saturday, April 1, 2023, 4:28 PM, Ron W4BIN <ka4inm@gmail.com> wrote:
Bob Gibson via Amps wrote:
> What would cause the filament not to get hot if there is continuity between
> the pins when 5 volts is applied? The tube has been sitting for seven or
> eight years.
> Bob
Measure the filament current.
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