What is the minimum number of tubes per bit required to store a CPU register in a vacuum-tube computer?
In particular, have any real vacuum-tube computers ever successfully stored more than 1 bit of a CPU register per tube?
Related, but not quite the same questions:
How many 6SN7 tubes did it take to store a bit? asks specifically about the 6SN7 tubes
- answers seem to imply 2 tubes per bit.
Answers to Can I build a working(ish) vacuum tube byte? mention
- 12AX7 tubes (a dual triode); that answer seems to imply 1 tube per bit, and
- dekatron tubes which can store 1 decimal digit per tube (and so could theoretically store 3 bits per tube); but it's unclear if this is actually usable as a CPU register storage.
The Wikipedia Williams Tube article seems to imply it could store 16*16 = 256 bits, but also seems to imply it was not usable as CPU register storage.