[Amps] 8877 filament

[gudguyham at aol.com]

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 at 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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