FWIW, if you have access to a 3D printer, making your own sockets is pretty
easy. I've made them for A101 dekatrons, and IN-18's.
I bought mine a few months ago for $350 US and I regularly use it to
fabricate all sorts of hardware items that would be very difficult to build
by hand. You just
Proper B17A sockets are rarer than hen's teeth I'm afraid. However, the
outer circle of pins on B26A- and B27A-based tubes is the same, so you
should be able to use these sockets too if you can find them. The B26A
bases were used by most trochotrons / beam switching tubes, so those do
come up
It looks like there is a metal-ish shroud behind the cathodes, and maybe
that is the anode.
You can confirm by applying reverse-polarity and see what glows; that's the
anode.
Without the anode screen, do these tubes appear 'clearer' , and possibly
brighter, when lit ?
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