On Mon, 20 Oct 2003 17:55:08 -0700, "Pat Barthelow"
<aa6eg@hotmail.com> wrote:
>Is the location of the glow important? I used to see Blue glow on the
>inside glass of 4-400A amps, and was once told that this is normal, and not
>indicative of Gas in the tubes. It was some kind of interaction of high
>velocity electrons with the glass. (kind of like Cherenkov Radiation?) Gas
>glows have to occur in between the cathode and the plate.....Is that
>correct?
_________________________________________________________
Correct. Location is important. Blue glow on the inside of the glass
is a mild X-ray effect, common even in some receiving tubes such as TV
sweep tubes.
As you surmised, a glow in between the elements is bad news.
--
Bill, W7TI
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