>> If it looks like it's on the inside of the envelope, it's ion
>>bombardment. If it's
>>inside the anode structure, then it's gas. In my early days, I replaced many
>>tubes I thought were gassy! Good for RCA, GE, etc.
>>
>That's pretty much it, Roger. However, "ion" means an atom that has
>gained or lost one or more electrons, I doubt that ions are involved. In
>this case, it appears that the flourescing material's atoms (probably one
>of the silica-fluxing elements in the glass recipe -- perhaps boron?) are
>being bombarded by electrons. My guess is that this element fluoresces
>as its electrons fall back into a lower orbit after being knocked into a
>higher orbit by electrons that miss the anode and strike the glass
>envelope.
Thanks for the info guys....Thought my tubes were getting gassy.
73,
Jon
KE9NA
-------------------------------------
Jon Ogden
KE9NA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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