[quote name='SS73' post='1006046' date='Oct 30 2010, 08:18 AM']I think the Lead head was a Sunn coloseum Lead as he didn't like the Bass version. But all these various Live amps, Marshall, Fender, Sunn etc all worked well, but studio work was I think Vox AC30. The important part is that Fuzz on the Neck pup.[/quote]
SS73 is right. Chris's basses were not biamped (in the sense of using a cross-over to separate bass from treble frequencies), but he did have his mono bass modified to output the two pickups independently (exactly like the ric-o-sound). I have heard that regardless of the stacks on stage, in the early yes tours, Chris's sound was taken from an AC-30, hidden behind and miced up.
I also think it's true that he used the fuzz on the neck pickup (not the bridge pickup, as you'd perhaps have been more likely to think).
What I don't know is where he actually uses this fuzz - I'd have thought that most of his grind was from pushing the AC30s.