After another week of testing I like the outcome of the latest CFA3smd something with the dual opamp bias servos. Thanks a lot Kevin.
My version is a Zero Feedback version of CFA3. I’ve heard, read, that some people favor the Super Symmetrical version. So, here is a drawing drafting of a ZF/SS version of CFA3smd something with…
… six small Omron latching relays. Five for ZF/SS switching and the sixth for LED identification of mode in progress. Two JST XH3 connectors for a momentary toggle switch and LEDs to control the ZF/SS modes.