[Amps] Arc distance and plasma

[Bill Fuqua]

I had just gotten some odd tubes on ebay (4x-500)  which were basically 
4x500 tubes with a 4-400 base. I figured that they were bad but thought I'd 
just try them on my tube tester anyway. I lit up the filament on one and 
could see smoke curling up in the inside. That is just not right! They were 
obviously at atmospheric pressure inside. Those were really gassy tubes.

73
Bill wa4lav


At 10:51 AM 7/28/2006 -0400, Tom W8JI wrote:
>Rather than claim I can look at a tube and magically tell
>what happened years ago with my magnifying glass,  I thought
>I would add a picture of a 3-500Z under RF plasma
>conditions.
>
>The photos clearly show then concentration of plasma during
>a hard fault.
>
>http://www.w8ji.com/fault_protection.htm
>
>Enjoy.
>
>73 Tom
>
>
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