I know this is a very obvious question, but the power supply your friend is using isn't doing something strange instead? That's certainly odd behaviour for a nixie...
Nick Sent from my iPhone > On Nov 24, 2020, at 20:14, Kevin A. <[email protected]> wrote: > > > I will definitely make some measurements once he has a chance to hand them > over. From what he told me, the whole tube just self extinguishes during this > phenomenon. Very odd. > >> On Tue, Nov 24, 2020 at 10:53 PM gregebert <[email protected]> wrote: >> Can you monitor the voltage and current of the tube while it's running ? I >> cant help wondering if higher voltage will keep it on. >> >> I made my own nixie bench supply which has variable voltage and current, so >> I usually set the voltage above 200V, and limit the current to the datasheet >> value, which is 4.5 to 6mA per segment for the 8971. >> >> Do all segments show the same behavior, or just some of them ? >> >>> On Tuesday, November 24, 2020 at 6:11:58 PM UTC-8 Kevin A. wrote: >>> Hi all, >>> >>> A friend of mine, also purveyor of cold cathode and other unique displays, >>> has collected two 8971 nixies that seem to be having an odd failure. >>> >>> When powering the tube on, it ignites normally and begins to operate. >>> However, after a period of 30 seconds or so, none of the cathodes can stay >>> ignited and they fizzle down into a state of very faint partial >>> illumination. >>> >>> Has anyone experienced this before? The most common failure mode has to be >>> outgassing, but the tube is still full of neon as far as I can tell. It >>> just does not stay ignited for more than a period of seconds. Can this be >>> remedied by applying some kind of high current or high(er) voltage pulse >>> the same way cathode poisoning sometimes can? >> >> -- >> 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/9ca0e0f5-53b7-49c7-a654-a817ca45bfd9n%40googlegroups.com. > > -- > 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/CALcVLK%2Biu8W%2BbKELTYenrkvgMHeGp%3Dxk4_PbrgK3VnQUmKP_jQ%40mail.gmail.com. -- 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/63B7ED85-D391-4AC2-9170-274EE3B10DE5%40gmail.com.
