On Mar 1, 7:00 pm, Terry Kennedy <terry+googleb...@tmk.com> wrote: > Despite what is listed by sellers, I have never seen a truly NOS > B7971. As they are run, the background areas around the elements > become lighter. I agree.
> > The original datasheet (of which I have several) claims a service life > of 50,000 hours. That's at the current they were run at in the > original LECTRASCAN application - they'd likely last a good while > longer in a clock or other modern display that wasn't being run at > full brightness in an office (sometimes even facing the street through > a window!). I have posted earlier versions of this: In the mid 1970s, I built three 6-digit clocks with 7971s and based on the CT7001 . They are MUXed at about 2kHz. So far, they have run nearly continuously for 35-38 years (over 300k hours) with no nixie failures. All of them were pulls with obvious lightening of the ceramic under the segments (probably lots of previous use). I would view the 50k in the spec sheet as a minimum guarantee and not as the time to expect massive simultaneous failures. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
