I don't know - it's a mystery. I checked everything very carefully, including the heater voltage (with a true-RMS voltmeter, since the driving waveform isn't a sine wave), in case I was overheating the cathode. I have a few more tubes, but when the second one failed like the first I put the clock away. Maybe I should get it out again and sacrifice another tube just in case.
I've seen a lot of tubes, but I've never seen any with such a thin phosphor coat as these. Usually they're white and opaque. These are gray and translucent. -- 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/1596f0fd-ebda-4ee5-9243-d3a051f5ffeb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
