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RE: And then again,

After an initial non-start with feedback as cathode degeneration (including cathode circuit use in RIAA filters) or global from the OT secondary (and those being the only forms I knew of at the time), I became interested again after reading some of Frank Blohbaum's ideas using 'nested' or local forms. Building some of his circuits confirmed there was positive potential there.

By the way: He gets that abundance of headroom you mention by making a transconductance amplifier at the input stage with a triode and BJT for 'abundantly' high gain (≥1000X ! ).

Any resistance to the subject of feedback I have now comes mostly from difficulty with the way it's talked about.
No matter how hard I try, I can only see the oft reproduced Crowhurst block diagram for series feedback as a parallel arrangement of some sort, and no-one so far has been able to explain it in a way that I can translate back into thinking that would be useful in designing tube circuits.

Last time at Barnes & Noble I scanned the shelves for "Feedback for Dummies" but apparently they were sold out. : )

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