Not to mention a lack of affordable tubes....7971's aren't very common on EBay, and when they do appear, the price skyrockets. I'm not a fan of segmented displays, so I've wondered if it's even possible to make a tube with 26 cathodes (A-Z), and perhaps fewer if you got clever by splitting letters with similar shapes, such as O,Q,C and I,T. Apparently Burroughs made 'alpha' tubes with letters A-M and N-Z (with a few letters missing) but I've never seen one. And neither is a full alphabet.
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