I'm no expert (on bass, or Geezer) but I think the majority of his tone from that era is in the right hand. Play way up the neck...like 15th fret territory. Strike the strings so you get some clank on the frets (which also involves your setup). The icing on top would probably be a little bit of dirt like tubes being pushed hard, which you can get from any number of pedals.
AFAIK the reason Al plays way up the neck a lot is because of Geezer...
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Thanks so much for this…
You actually just raised my playing confidence level a little bit by posting this bc I’m playing a P w/ Geezer EMGs and SH77 flats…
Especially when I’m down-tuned tune I constantly find myself gravitating to the 8-12th fret something about that location on the neck makes we hang out there especially if I’m down-tuned…
I have worried this is “wrong” from a technique standpoint as I get/understand that those notes are also on the A string-I just like the way the lowest string sounds and it’s actually a little bit more ergonomically comfortable…
As for my flats-I intend to (literally) never take them off as they are starting to sound more and more like the kind of tone I’m seeking…
Thanks! \m/