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[AMPS] Gassy tube??

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Subject: [AMPS] Gassy tube??
From: (Rich Measures)
Date: Sat, 13 Feb 1999 16:52:50 -0800

>Hello All,
>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
>voltage, etc.)
?  Seal problems don't get well, Steve


R. L. Measures, 805-386-3734, AG6K,  

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