Here's a photo of one of my Sylvania 6910 dekatrons, glowing:
<https://lh3.googleusercontent.com/-412fpZYJA84/UcRmRG8mxpI/AAAAAAAAKqw/GerFtuBAQTo/s1600/SYL6910_6.jpg>
The color is the pink/orange on the fringe. That's the color of 3 of my
6909s, both of my 6910s, and a Z505S, when it was working. I did get
another 6909, as a swap for a 6802, in the last year, that has a glow that
is more of a standard dekatron's orange. Its still a little more yellowish,
than the standard speed orange, but closer to that orange, than to the
pinkish /orange,in this photo.
I did try a simple spectral analysis with a cheap plastic spectrometer,
with inconclusive results. The gas mix has lines all across the spectrum. I
need at least a spectrometer, of the grade, that I used in college, so I
can get some actual measurements of each of those lines. These tubes
definitely use some complex gas mix.
As you can see its not the blue/violet that you see in 3-guide ("single
pulse") tubes, like the OG-3 & GC10D.
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