Thanks Gene -- I'll keep an eye on it and let you know. Terry On Wednesday, January 22, 2014 9:56:13 AM UTC-6, Gene Segal wrote:
> When you have a sudden performance issue, it's gas. Especially when large > sections of large-area cathodes go dim. Poisoning from sputtering affects > small sections and is observed over longer periods of time. I'll bet that > tube will start going pink soon. > > Sent from my iPhone > > On Jan 22, 2014, at 7:41 AM, Terry S <[email protected] <javascript:>> > wrote: > > Gene, please explain how you know this is the case. > > Thanks > > Terry > > > On Wednesday, January 22, 2014 9:30:40 AM UTC-6, Gene Segal wrote: > >> You're all wrong, it's leaking gas through the pins. >> >> Sent from my iPhone >> >> > On Jan 22, 2014, at 7:27 AM, Adam Jacobs <[email protected]> wrote: >> > >> > This is an issue that is most obvious on clocks with lots of >> functionality. If there are different modes/menus that display numerals on >> a tube that are not normally lit as part of the clock, then you'll see >> this. Best advice is to take full advantage of automated cathode-poisoning >> prevention routines. >> > Clocks that don't have any menus, i.e. they don't ever display a >> numeral on a tube that wouldn't be displayed as part of the standard clock, >> still have this problem but it's not anywhere near as obvious. >> > For example: If the 10-minutes tube only ever displays 0-5 in the >> course of being a clock and I don't have any additional menus or modes that >> might try to display something besides those values, then the critical >> poisoning of 6-9 doesn't matter to me. >> > >> > John is right. Try to repair the cathode poisoning if it is still >> fairly mild. I've had great luck in the past doing this with IN-8-2's. [I >> learned the hard way on some of my earliest clocks regarding current >> limiting resistors. :S] >> > >> > -Adam >> > >> > On 1/22/2014 5:36 AM, John Rehwinkel wrote: >> >>> One of the IN-18s in my Nixichron has started to fail. I don't know >> if it's cathode poisoning or some other failure mode. >> >>> In the 10's hours position, several of the digits are not lighting >> completely, they are dark toward the bottom of the tube, probably the >> bottom 1/3 of the numeral. >> >> Sounds like cathode poisoning. >> >> >> >>> This happened rather suddenly, or at least I only noticed it >> recently. The "1" digit is fine, and that's what is lit most of the time. >> The other digits only come into play during display of the GPS coordinates >> every 1/4 hour. As they scroll across the clock, I can see the bad digits. >> >> Yeah, cathode poisoning happens when not all the digits are used >> enough. >> >> >> >>> I do have a couple spare tubes, but they have no hours on them. I'll >> try one to be certain it's just the tube. But I'd actually like to find a >> used tube, something with several years worth of use on it, so the >> brightness will be a better match. >> >> It's worth trying to depoison that one. The easy way is to swap it >> with one of the other digits that gets used more evenly. The quick way is >> to run those other digits for a bit a higher-than-normal current until they >> light fully again. >> >> >> >> - John >> > >> > -- >> > 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 post to this group, send an email to [email protected]. >> > To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/52DFE351.7030606%40gmail.com. >> >> > For more options, visit https://groups.google.com/groups/opt_out. >> > -- > 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] <javascript:>. > To post to this group, send an email to [email protected]<javascript:> > . > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/191985dc-65bf-4a2a-ae1c-57984c742113%40googlegroups.com > . > For more options, visit https://groups.google.com/groups/opt_out. > > -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/4048adf2-9e88-4f37-b081-011f6a3d1730%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
