In addition to photons and cosmic rays, illuminating other elements can also promote the firing (isn't that the reason for the "keep alive" on the Panaplex?).
It has been a long time since I did it, but ISTR that you could stay on the negative resistance branch by aggressively limiting the current. In the olden days, that was using bigger resistors, but nowadays I would build a transistorized variable current regulator. On Wednesday, May 27, 2020 at 7:05:48 AM UTC-7, gregebert wrote: > > I had a very difficult time trying to measure the firing voltage, probably > due to photons and other particles whizzing around the workbench. > Typically, it was about 10-15 volts higher than the smallest measurable > current where I could see any hint of glowing. The value varied from > reading-to-reading. > > I recall that I could not repeatedly/predictably measure currents below > 100uA, because the segment would just extinguish and the current went to > zero. > > Whenever I get my last 2 R|Z568m tubes, I'll spend more time on ionization > measurements. Right now, those tubes are still waiting on a dock or tarmac > to get shipped to the US. > -- 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/a885d17c-504f-468a-b800-88b29e3e4469%40googlegroups.com.
