The blue ones I have (and looks like yours as well) also show brass in some places (top and bottom). I have over 100 assorted IV-6 tubes here and to me it looks like they're supposed to be brass color but some chemical reaction has turned them blue.
On Monday, December 7, 2020 at 6:32:40 PM UTC+1 Paolo Cravero wrote: > Hello. > Today I received some assorted used IV-6 VFDs and two of them have a blue > background. The lot spans from 1976 to 1992, so I am not surprised there > have been variations in base materials, but I never saw them before as I > haven't got many VFDs (yet). Maybe I am a bit disappointed because I got > only two blue's :) I am wondering how common they are. > > In the same purchase I bet on a lot of IN-16 sold as "for spare", which > are obviously 100% outgassed even if visually intact. Can't raise a > complaint, I've lost a bet, while I was hoping for some cathode poisoning. > Besides smashing a couple under a hammer and testing fall against different > floor materials, has anyone got a clue what do people do with dull Nixies?! > > Paolo > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/a56c2492-3d81-4ee9-a45f-f45a9356d1b8n%40googlegroups.com.
