Hmm. This thread somehow got deleted. But anyway, as I was saying.....The National NL-6844A always tests better and with much more success than the Burroughs version ever does. These are certainly NOT ideal tubes. Short life. No mercury. But they do make up for their deficiencies by looking cool while they actually operate correctly. Especially on a clock that has them mounted on a clear case, and sticking out the front. -Chuck
On Saturday, April 27, 2024 at 12:28:57 PM UTC-4 David wrote: > 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 <leroypu...@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/b5bd1f2f-1b52-4b0b-83c8-529204849954n%40googlegroups.com.
