...I also was lucky enough to stumple into a cache of 7 1/2 ips RCA and Mercury tapes that are still in pretty good shape some 50 years on. As good as a well setup LP rig is, if you have the where-with-all to make the jump, tapes are an other-worldly experience
Comments like this make me wonder what people are really hearing with tape. I have very little experience with 15 ips 1/2-tracks like The Tape Project and some of Bruce B's tapes that he plays at shows (just at shows, in fact), but I have a huge amount of listening time with 7.5 ips 1/4- and 1/2-tracks. First, few if any of those old commercially recorded tapes from the '60's (and very early '70's) sound very good. They were all high-speed dupes on mediocre tape stock and sound like it. It's actually a little surprising that these tapes aren't full of dropouts and edgewarps, but if they aren't now they probably will be after a few more plays. Second, even well recorded 7.5 1/2-tracks recorded on a Nagra IV or Sony 770 don't tax the capabilities of good 24/96 digital (much less 24/192 or DSD) to make indistinguishable copies. There was even a small company in the late '80's and '90's doing 1:1 dupes of their own master tapes at 7.5 ips; not SOTA sound even then, although it was kind of fun!