I'm looking to replicate John Paul Jones' tone in No Quarter, off houses of the holy.

Would a big muff russian work, or does he use some other kind of effect?
Not my band, but something you should definitely listen to:
Toast Machine
Don't know about effects, but I'm pretty sure he used.....
A bass.
Maybe you'd have better luck in that forum.
He used an organ, no bass infact no guitar.
JPJ put a phaser through his organ I believe.

Still a phaser on your guitar should work well with the song.
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