> On Monday, October 9, 2023 at 11:35:41 AM UTC-7 gregebert wrote: > None of my 7971's has aged enough for the segments to get flaky; my clock went into operation in 2017. Knocking on wood....
On my first clock, my original version did have partially illuminated segments when I used +170vdc. There were no partial segments after I increased it to about +190vdc. The next two clocks started with +190vdc and never showed partial segments. The first clock was built in 1975, and the next two were built in 1977, all using dollar specials from Meshna, presumably NYSE pulls with thousands of hours of previous service. None of the tubes have failed or shown significant degradation. Other components have failed (clock IC, HV transistor, power transformer), but there have been no tube failures after over 300k hours. There has been some darkening on the glass envelope (sputtered cathode?) and a slight color shift to a more pinkish glow. -- 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/da51f054-c161-4c8d-94ad-5f3a70454f24n%40googlegroups.com.
