I don't often post on this thread, but I recently went back to the phono cartridge which came with the Sony linear-tracker, a Shure M110HE with a JICO stylus. Vinyl now sounds like it should. Last night, I came across the four big AQ sorbothane pucks/biscuits, and slipped them under the feet of the Sony. Listening this morning, it didn't sound right, so I slipped them back off, letting the TT back onto the MDF/plexiglass stack. The solid weight did better, and vinyl sounded better.
Anyway, I listened to Joni Mitchell's Hejira, a promo copy I bought from Love Records (a local, and legendary, LP shop) back in 1977. At least "Love Records" and the date are stamped inside the jacket. My careful buying practices paid off here, as the fidelity and sound are quite nice, and groove condition is near noise-free. I rarely listen to this LP except on snowy winter evenings...