I have seen multiplexed designs use a bias resistor to hold anodes at a voltage below ionization when they are not selected; in fact one of my Sperry / Beckman datasheets makes specific mention that this type of biasing is necessary.
Do you have a schematic ? I've seen similar behavior with NE-2 bulbs years back; a faint erratic glow is visible when one lead is connected to the AC line (in my case, 120v /60 Hz) and the other is unconnected. I dont see this behavior with my nixie clocks (they are all direct-drive) because all tubes have exactly 1 cathode driven at all times. Now that you've raised my curiosity, I'm going to poke around with some tubes on my bench to see if I can get a faint glow with only 1 terminal connected. -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/5a774e89-1947-4ea6-b79f-23e5ef86d8ae%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
