*NO* green displays are Nixie tubes.
But for
the more genericized meaning [of "Nixie"], I can't see any
reason a similar device couldn't be made and filled with a different
gas mixture so as to produce a green instead of red/orange glow.
Except that
that's not at all how VFDs work.
No, of course not.
I wasn't trying to suggest that it was likely the original device
worked this way; I feel moderately sure it's vacuum fluorescent. I was
taking issue with the dogmatic statement that "*NO* green displays are
Nixie tubes". I don't know of any, but I see no reason it couldn't be
done and, since there's a plausible way to do it, I am not nearly as
confident as you are that it's never been done.
Indeed, given decent vacuum equipment and a supply of the gases in
question, it would not be out of the question to take a stock Nixie,
open it up, and replace the gases inside to create a green Nixie. It
might even be something a few people could do at home. :)
Assuming there is such a gas mixture, of course.
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