If the mesh glows (as this one seems to be doing) then suspect that there is AC instead of DV applied. The mesh can't glow when the right potentials are applied, whichever the value of the current through it is.
Gastón On Friday, June 30, 2017 at 8:11:55 PM UTC-3, Roddy Scott wrote: > > I don't have a power supply but the spot occurs on the mesh and with a > different digit there is a a different spot. The tubes were NOS and I have > had them lying about for over a year in a box. I have a couple of QTC > boards so I am going to try them on those boards to see if they are the > same. > > I have never seen anything appear on the Anode mesh with any tubes that I > have used so far so this is totally new to me. > > > On Friday, June 30, 2017 at 9:50:36 PM UTC+1, gregebert wrote: >> >> How do things look when you bench-test the tube on a DC supply ? >> >> Is the spot actually on the anode mesh itself ? Ionization occurs at the >> cathode, so this is indeed strange. >> >> -- 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 post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/81cb21ca-9ff1-4834-8dd8-cad2a2910dce%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
