Black Dog probably an old Supro practice amp with 6v6s.
Sunshine of your Love most likely a Marshall Plexi, the live version for sure. Maybe with a fuzz face on the solo.
Anything more recent probably relies a lot more on pedals than stuff recorded in the 60s/70s. Just didn't have the pedals, see? Effects in those days tended to be obvious, fuzz, wah, univibe, that sort of thing.