Do these have dome-tops, or are they flat ? I have several dead/near-dead Burroughs 5031 and 6844 nixies, which are the predecessor of the legendary 5092. All of them have dome-tops. I suspect that the 6844's you have might be the same construction as the 5031. I have a few of these myself, and no amount of high-voltage/high-current has been able to recover them. I concluded that they have leaked, rather than suffered from cathode poisoning. I have others that have sputtered, leaving a dark residue inside the glass, and a few with cathode-poisoning that just dont want to recover.
I dont know where you got them, but it wouldn't surprise me if they were sold as "untested". Give one of them a trip thru the microwave oven and see what happens. I'm gonna do that to one of mine. On Thursday, December 10, 2020 at 3:37:55 PM UTC-8 Chuck wrote: > I would like to ask the group about an experience I am having with a batch > of (8) Burroughs 6844A nixies just purchased. > > They are new in box from 1968. All have same date stamp Mar 4, 1968. As > far as I can tell they have never been out of > > these original boxes. I tested them and they all malfunction the same > way. The tiny wire leads inside the tube which > > connect the digit cathodes to the pins get surrounded by a bright neon > glow, and the digits never strike. Once in a while > > by connecting and reconnecting rapidly, I can get a digit to strike, but > not often. > > What is going on inside these tubes which causes this? They were tested > at 170 volts DC with 15k anode resistor. Dropped that down > > to 10k for a few tests, which helped a bit with some partial digits. But > this entire batch is bad. What causes this? > > The glow seems plenty bright. Thanks, Chuck > > > > > -- 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/c5a784c3-ab64-4e09-993f-a979475e0239n%40googlegroups.com.
