I had none in storage, and the ones I purchased in the past year had no signs of stress. Is it possible yours were damaged in storage ? I've never seen glass weaken on it's own. Also, the pins are fairly rigid (unlike IN-18's which are quite soft) so if there are any bent ones, it suggests the tube was stressed while stored.
I suggest you carefully inspect the base for glass-cracks, then bench-test them. If you are into data-collection, I suggest gathering I-V data for each segment on each tube, then plotting and comparing. It takes a bit of time, but I'm glad I did it for mine. -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/d4cdb80d-9854-4cba-937e-2e8f26d311ce%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.