Steve, your memory is pretty good. I have a number of Capitol produced first issues from the sixties and most of the Ampex issues from 1970 and find that there is nothing exceptional about the audio quality. Abbey Road from what I recall may be the best Beatles reel for sound quality with ample bass. I last compared two copies of Hey Jude and found each bass shy, however I was listening with a set of speakers that may have been to close together so there could have been some bass cancelation but this was not apparent with other tapes or sources at the time.
There are Canadian issues of the Capitol tapes (all of mine are from the U.S.A.) that I have no experience with.