Well the facts are that the National NL-6844A tubes always test much better than the Burroughs versions do.
I know they are not ideal tubes. No mercury. Limited lifetime. But they do look cool especially on a clock that has them poking out the front. Chuck ---- Original Message ---- From: "David" <nixiebu...@gmail.com> Sent: 4/27/2024 11:35:58 AM To: neonixie-l@googlegroups.com Subject: X-IMail-SPAM-Connection Re: [neonixie-l] Lighting of only cathode lead wires I have seen this also on these tubes. The 6844A is an early tube design that didn't have mercury added to prevent cathode poisoning. I doubt that anyone has done recent research on this phenomenon, so we're left with conjecture. Here's mine: after the cathode gets poisoned, the plasma has to be generated somewhere. That somewhere is the lead wires. Later tubes had insulating paint applied to the lead wires to prevent this. It's usually white or green. David Forbes, Tucson AZ > On Apr 26, 2024, at 7:29 PM, Leroy Jones <leroypurifoy...@gmail.com> wrote: > > > Hello, A while back I was testing a batch of Burroughs 6844A nixie tubes. > None in the batch worked correctly. Only the cathode lead wires glowed, not > the > digits themselves. I have noticed this repeatedly on Burroughs 6844A tubes. -- 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/815E0EF3-E61A-4EB6-96EA-F381281D3604%40gmail.com. </leroypurifoy...@gmail.com></nixiebu...@gmail.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/202404271045663.SM1406945%40ADT-IM1.
