vac tubes / was Re: Schematics of Atanasoff-Berry Computer logic circuits?

Dave McGuire wrote: Just to put a number on it, in 1955 alone, 480,000,000 receiving tubes were produced (Electronics, Sep. 1956, Figures of the Month). I presume/guess that was U.S. production. At the radio museum we get boxes and boxes of what we call "TV-junk" tubes, a variety of types that were targetted for, or commonly used in, 50/60 era TVs, and which didn't get used much in home radios. The result, because these days there are far more people restoring radios and doing tube audio compared to restoring TVs, is that there are lots and lots of these tubes and a very low demand for them. It has occurred to me that if one were setting out to build a (small?) tube computer today for fun, to look into selecting the primary tube(s) from that class; the question being if one would do any better than just using duo-triodes, which are in higher demand.