Re: [neonixie-l] Question on haze around nixie digit

[Dieter Waechter]

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 

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