For the dekatron geeks among us...

[Jon]

With the kind assistance of Nick, I recently got my hands on rather a rare bird - the Chatham Electronics CH1047. It's a big tube with a B14A base, rather ugly to my eyes, but very interesting nonetheless. Made for a short period in the mid 1950s, the internal construction is quite different to other counting tubes, though the operating mechanism is essentially that used in the Western Electric 6167. It's a base 10 selector with directional cathodes and transfer electrodes, so only spins in one direction. And it glows a rather fetching purple colour...

Attached are a couple of photos showing an overview of the tube, and also the glow resting on one cathode. Using my Dekatron Explorer unit (modular universal dekatron tester), I was able to spin the tube up to about 2000 pulses per second - a slow speed spin is shown in the linked Youtube video (apols for the quality - it was a quick hack movie on my phone).

Jon.

[Audrey]

Wow, what a large beautiful thing

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[Nick Andrews]

Sweet, I like it.

[Bill Notfaded]

That's super cool!

B