He picked up the two problem tubes as spares for his black emerald 8971 clock. The original 6 8971 tubes work just fine in the clock, no matter what socket they are in. Only when one of these two problem 8971s are popped in place, does this issue occur. This leads me to believe it is a problem with the tube rather than the psu or driving circuit.
I'll ask for a video and will definitely be making measurements once I get a hold of them for experimenting. On Tue, Nov 24, 2020 at 11:21 PM Nicholas Stock <[email protected]> wrote: > 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 >> <https://groups.google.com/d/msgid/neonixie-l/9ca0e0f5-53b7-49c7-a654-a817ca45bfd9n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > 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 > <https://groups.google.com/d/msgid/neonixie-l/CALcVLK%2Biu8W%2BbKELTYenrkvgMHeGp%3Dxk4_PbrgK3VnQUmKP_jQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- > 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 > <https://groups.google.com/d/msgid/neonixie-l/63B7ED85-D391-4AC2-9170-274EE3B10DE5%40gmail.com?utm_medium=email&utm_source=footer> > . > -- 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/CALcVLKLDxVKzDu7bAEgLLhBNWEeFbdjKi0NnBwc%2BqeAsWQcs1A%40mail.gmail.com.
