I replaced the 2nd tube last night. It tests bad in the same manner as the 1st -- a small purple glow from the neon sign tester, no cathodes light up. I installed a replacement tube and ran the clock overnight -- almost 24 hours now, and everything seems fine. The printing is gone from the tubes, I cannot compare date codes. The tubes look identical.
If the current was excessive, then the digits should be brighter than the others. They are not. And the anode resistors measure OK. Curious note, the same owner has sent me another, identical clock to repair.... the saga continues. Terry On Friday, November 18, 2016 at 10:27:00 AM UTC-6, gregebert wrote: > > After you've removed both tubes, I'm curious how both will bench-test. I > still cant figure out how 2 would fail simultaneously. > > Check with the clock's owner to see if 1 tube failed first, and they used > it like that for awhile, and then the second tube failed later. If that's > the scenario, there has to be a circuit-wise explanation for the second > tube's failure. Perhaps excess (ie, 2X) current ? Maybe a bad batch of > tubes (compare date-codes) ? > > I've only had 1 nixie actually fail on me, and it was due to a > manufacturing defect (internal spot-weld broke). OK I lied, I had a bunch > of IN-1's fail, but they dont count..... > > -- 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/92019dd1-cb27-4197-8084-7138fea4697f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
