On Wednesday, January 22, 2014 5:19:07 AM UTC-8, Terry S 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. > > 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. > > Has anyone seen this particulat failure mode in an IN-18? Bottom of some > digits failing to glow? > > 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. > > Terry >
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