12-05-2020, 02:49 PM
I did call and spoke to a nice lady. Haven't heard back. Not really important, just fyi.
I think that the small filament/cathode leads to a short life in these tubes especially since it is operated at a low temperature - dull red, or no glow at all.
I think that the small filament/cathode leads to a short life in these tubes especially since it is operated at a low temperature - dull red, or no glow at all.