Long time reader, first time poster!
Equipment wise when using the Rickenbacker, Geddy used dual Ampeg SVTs, one for bright/drive, and one for deep tones. In the 80s, he switched to the 72 Fender Jazz for recording, but still used other basses live. He switched in the mid to late 90s to rack gear with no amp, including the RPM. He came to SansAmp to distill things down to the single rack unit. He used one of the prototypes at the Yes induction into the RRHOF in 2017.
The GED-2112 rack mount unit is all he uses now.
Only six years late, but now you know!