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.
