Looks like vacuumglow is aiming to refill tubes:
https://www.facebook.com/vacuumglow/posts/704184109789357
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None of the production process is shown and as we know from dalibor, it's complex and takes years to get right. Pretty sure dalibor has used different gases too.
The Penning Mixture of Ne+Ar is completely standard - the others are interesting but maybe not practical due to the high strike voltages needed.
I've made letter tubes using He and Xe- not sure those would be usable in a small indicator tube.
I worked with Richard Wheaton, one of the top hot glass artists in Europe (he made the "people like neon' display in our banner), on refilling some damaged tubes I had. Ultimately it wasn't successful as the glass in the tubes becomes brittle with age and it's very very tricky (read as "not economic") to get right for a host of reasons.
Nick
Looks like all they've done so far is pop an existing IN-18 and refill it with their own mixture. That's fairly simple to do, but it won't run for long since they spoiled the getter.Different noble gases in tubes would be amazing though.
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One question: How did you manage to attach a stem to the IN-18 base without cracking it? It seems like a very risky operation to me, so kudos that you pulled that off!
Looks like vacuumglow is aiming to refill tubes: