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]<javascript:>> > 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] <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/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]. 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/191985dc-65bf-4a2a-ae1c-57984c742113%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
