I have owned just about everything Mac ever made between 1966-1979. I like the “Mac” sound and the build quality.. But the Sansui sound pre 1977, like your 771 is just magic. I don’t care about everyone’s ’mid-Fi’ antics, and 30 wpc channel is probably more than you ever use at normal and above average listening.
If you enjoy the Sansui sound then keep it. No, it doesn’t have snob appeal or the panache of McIntosh, but personally speaking to me it almost always sounds better, and isn’t that what’s important?
Norman