On Monday, April 29, 2013 1:37:17 AM UTC+10, jrehwin wrote: > > > That unattached mesh you have, may be floating at a voltage around 50V, > and alter the current path (?). I believe the blue dot indicates a point > of higher than usual current density. > > I suspect Mike's hypothesis is valid. If you make an ordinary linear neon > tube and fill it with neon, it glows red, as you'd expect. If you > introduce mercury into it, the red glow is replaced with the blue glow of > mercury. So something about the normal operation of neon tubes favors the > mercury glow. Nixies favor the neon glow somehow, and the difference may > indeed be current density. I suppose one useful test would be to take such > a linear mercury/neon sign tube and run it on various currents and see if > the red neon glow reappears at some point when reducing the current. > > - John > >
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