Re: [neonixie-l] IN-18 resurrection

Tue, 07 Jun 2011 16:07:23 -0700

Yes, I have a few of those as well, which show no cracks or physical damage, yet have lost gas, probably through the pins.  Does anybody have any ideas on how to fix that kind of problem?  How to seal the metal-to-glass interface?  By the way, isn't that a special material between the pins and the glass, whose coefficient of thermal expansion is somewhere in between the coefficients of the glass and the metal?  I can see an orange kind of substance painted on the pins, at the glass interface.

Jens, thank you for the clarification, but I think the definition of vacuum is "negative pressure", so a loss of vacuum is a loss of negative pressure, and a loss of a negative is a gain of a positive, so therefore it is an increase in pressure.  And of course, PV does equal nRT, especially in a nixie tube, because neon and argon are pretty close to being ideal gases.

Gene



I have one that no longer works, have no idea why, I may have lost vacuum when I was pulling or re-inserting it into my clock after doing some work on one of my clocks.

On 2011 Jun 07, at 15:02 , Gene Segal wrote:

Nixie Gang,

Is there anybody interested in bringing their IN-18's back from the dead?  Specifically, those of you who have suffered broken "pupiks" (glass bibs or pips between the pins).  I am not an expert, but was thinking that those could be refilled and sealed.  If we get a decent number of these casualties together, then perhaps it would be interesting to some expert neon glass guy to refill them.  So the question is - how many of these could we get together in one location, in order to approach an expert.  I can get us started with about 20.

Perhaps we could devise a voucher system, so that everyone sends their dead guys to one person, then an estimate is obtained for the lot, and everybody pitches in their share.  These would be only for private use, since longevity would probably suffer...but it might be worth it for some to pay $20 per tube, for example, to have a backup. Thoughts?

Gene

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