Has anyone tried to re-gas these tubes? Risky for sure but maybe doable with the right equipment.
On Wed, Nov 25, 2020 at 5:53 AM Paul Andrews <[email protected]> wrote: > It can be a result of out gassing. I had a ZM1082 that got damaged and > slowly outgassed. Towards the end, this is exactly what it did. > > A neon test using some high voltage source doesn’t tell you what the > pressure is in there, or how much other gas there is. I have another tube > that passes this test, but will nit light up at all no matter what voltage > and current I use. Conversely I have some planar displays that do not pass > that test, but light up just fine. > > On Tuesday, November 24, 2020 at 11:38:06 PM UTC-5 Pramanicin wrote: > >> That would appear to be a logical conclusion....I wonder if there's a >> poor anode connection that separates after heating? Odd for sure....looking >> forward to your results! They're rare tubes.... >> >> Sent from my iPhone >> >> On Nov 24, 2020, at 20:25, Kevin A. <[email protected]> >> wrote: >> >> >> >> 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 >> <https://groups.google.com/d/msgid/neonixie-l/CALcVLKLDxVKzDu7bAEgLLhBNWEeFbdjKi0NnBwc%2BqeAsWQcs1A%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/aa52987e-8333-4920-b3e3-1ab33d2a2c01n%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/aa52987e-8333-4920-b3e3-1ab33d2a2c01n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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