Hope you don't mind me jumping in on this thread. I apologise if so, but seemed relevant and I think Dylan has been answered. Regarding blue spots: I am of the understanding that if you drive a nixie with too low a Ucc that a blue stop may appear (although still do not understand why?) I was testing some Mullard ZM1177's the other day with a jury rigged hv supply on a breadboard with an appropriate anode resistor, as I tested the 3rd one a blue spot appeared in it, same with next, quite bright too. I then realised I had connected the tube reverse polarity ie neg to anode (teach me to use same coloured jumper wires). Reconnecting anode to pos and all is well. My question: Why does the blue spot appear with the polarity reversed and I didn't think a nixie would light (properly) in such conditions. Would be grateful if someone could steer me in the right direction.
Dave. On 16 Feb, 04:42, "Dieter Waechter" <[email protected]> wrote: > The purple, pinkish or peachy haze comes from the different additional gases > and the mercury inside the tube. > You may find out from the spectrum (in some cases) what mixture is in the > tube. > Second, the lower the Ucc (cold cathode voltage) the higher the haze. And > the more blurred the glow. > IN extreme cases (Ucc too low) the haze become ghost spots in the tube > (known as the blue spot problem at IN-18 tubes) > To get a high definition readout, ot the best you can get out of the tube, > drive it without Ucc in direct drive. > Dieter -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
