Tristated output to two common Base transistor issue

[RussMartin]

What a coincidence, Bruce! --Last night, I started sketching something that came out kind of similar to your approach, except I was using NPNs. Yours is better. (Did you set that up on a simulator?)

And, Darrel, I think I was going in your direction. This was to be my next step:

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. . . with D1 and D2 generic small-signal or switching diodes (e.g., 1N914). I had long-forgotten about using a zener diode in that manner!