Appears that I've cleared the first major hurdle in this process - the system now has 'mojo', the ability to draw one into the sound; it just "works" as a way of experiencing a 'historical' musical event - I don't have to make mental excuses for it "not being quite right" ...
This came about through eliminating the Balance pot, potentiometer - I knew it was causing some degradation, because moving its position when the sound was irky, and thus momentarily cleaning the contacts, decidedly improved things. So, this part was effectively chopped out of the circuit and fixed resistors which mimicked a centre setting for the control were inserted. But I was still surprised by the degree of improvement - I note that the service manual "proudly" states that these parts are by Alps ... this didn't help much ... :-)
Even CD-R disks which are straining the error correction circuitry, as evidenced by the popping and snapping sounds, and much skipping, are quite possible to listen to .... for a while.
So, I'm a happy chappy - there is still much that can and needs to be done, but the quality is already at a very good standard - plenty of potential to exploit.
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