vac tubes / was Re: Schematics of Atanasoff-Berry
pete at dunnington.plus.com
Fri Sep 5 16:12:34 CDT 2008
On 05/09/2008 14:37, dwight elvey wrote:
>> Date: Thu, 4 Sep 2008 11:59:04 -0400> From: wdonzelli at gmail.com> To: cctalk at classiccmp.org> Subject: Re: vac tubes / was Re: Schematics of Atanasoff-Berry> > > There is no green Ne-2. You can put a filter on a NE-2 and> > get a nice red or yellow but not green.> > Well, you are technically correct, as "NE-2" was originally a standard> - the little orange glowing tube we all know and love, but there were> some makers that did make a green version. The inside of the glass> bulb was frosted with a green phosphor.> > --> Will
> Yes, I've seen the phosphor ones but I think they may use
> a different mixture of gas.
> Using a diffraction grating or prism on a neon shows one yellow
> and two red bands( as I recall ).
> I suspect that the phosphor ones would have different
> operating voltages.
I don't think so, or at least not very different (I didn't actually
measure it). I've got a couple here, salvaged from flashguns that had
one red/orange neon and one green one. They look the same, except for
the band of phosphor at one end of the green ones, and ran off the same
voltage. The green ones aren't completely covered with phosphor inside,
and it's possible to see the usual orange glow when you look in the end
with the wires, too. I must go and find a diffraction grating -- I know
I've got one here somewhere...
Pete Peter Turnbull
University of York
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