Hands Of Doom - Black Sabbath. That bass intro is warm and tubey. It typifies (imho) flats played the Geezer way up over the end of the neck.
Yes - Yours is No Disgrace. Typical Rickenbacker clank (the most musical clank I can think of!), warm tubey tone again but with roundwounds played with a pick. Very clear on this track.
Roundabout by Yes is a classic Rick sound.