On Friday, May 15, 2020 at 9:51:45 AM UTC-4, gregebert wrote: > > For each of my expensive tubes (b7971, R|z568m) I measure and plot the I-V > characteristics. There aren't any serial numbers on b7971's so I just write > one on the backside. > > If the tube fails later on, I check the I-V characteristics to see if > anything changes; so far only 1 b7971 has failed when segments shorted > together. None of the unaffected segments showed any measurable changes. >
B7971s are amazingly robust. The MOD-SIX in the room where I'm typing this reports 76,571 tube-on hours (nearly 9 years) and is on its original tubes (the CPU, PSU and case have been replaced over the years, with the tube-on hours copied to the newer CPUs). I've never had one that worked when I got it fail on me. In around 100 I've purchased over the years I've had 4 or so DOAs - 2 cracked, one with an unfixable short and one with a poisoned cathode I couldn't clean up. -- 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/56857632-6d7f-4291-a200-568d5f3cb391%40googlegroups.com.
