Designing a tube mic preamp.

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> nothing wrong with the 12AX7. It is one of the very few tubes actually designed for audio use

More likely a fire-control op-amp part. Who the heck would need that much gain TWICE in an audio path? And in 1947, not a high-point in audio history.

Surely derived from 6F5/6SF5, slightly improved and doubled-up.

Yes, soon after registration it became a go-to for many audio designers, and the makers began to care a little about audio faults, though often pushing different types (12AX7A, 6EU7, 7025) to be sure of getting the audio mods (and prices).

It is about the best Gm/Ik of any common tube.
 
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