After much 'goosey-ness' I finally applied HV to my 10 meter 4-400 amp.
One of the two tubes appears really gassy. Looks more like a mercury vapor
rectifier than a power tube. It has a very apparent violet glow to it.
When I fired the amp up all was OK. I shorted the keying line to check the
idling current and that's when I saw the glow. It appears to be drawing
about 25 mils of grid current and the idling plate current seems a bit low
at about 75 mils. This is all with 4500 volts on the plate.
Is this tube beyond hope or is there some sort of 'de-gassing' procedure
which MAY work (extended filament time, 'burn in' with a lower plate
73 de Steve, NJ4F
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