I have a variety of B7971's with different micas, 'burn' marks, pins in the top of the envelope etc etc. I have yet to have a tube fail on me in day to day use after many years. I don't think it's an indication of any life expectancy for these tubes.... they appear to be built like tanks.
Now that I have said that, I await the inundation of messages talking about B7971 failures...... LOL Cheers, Nick On Mon, Apr 24, 2023 at 10:42 AM Robert Norman <robnorman...@gmail.com> wrote: > I have 9 tubes, 5 show no sign of any marks, 2 show marks on a couple of > the connections and 2 show more extensive marks, all work perfectly. > > Are the ones with marks more likely to have a shorter life? > > Rob > > -- > 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 view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/17DE8F39-16DF-4E6D-8D4D-6D434E8558E3%40gmail.com > . > -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAOX%2BRH%2BNcGPNmq8xco0H3DEtB110zNcNbh9Cfx3ZpGu6JnYuBw%40mail.gmail.com.
