[quote name='BassBunny' post='730474' date='Jan 31 2010, 12:33 PM']One thing to try first is to meter the pick-ups in case that is where the problem lies.[/quote]
Thanks for that, good suggestion. Neck is 7.20 KOhms, bridge is 7.25 so I reckon that's close enough.
I have 3 Bass Collections: the 460 is 1995, the SB310 is also 1995 and the fretless (SB321?) is 1991. All three have completely different electronics and none of them have the trim pot that Laurence has on his 330 . Only the 460 has the gain switch, same as Bassbunny's. The 310 has all the electronics on a single board, with 3 normal pots, rather than having it distributed over a number of circuits on each pot like the other two.
Clearly it's all quality hand-made guitar circuitry, none of your production-line stuff here. Some of the soldering on the 460 isn't great either - it looks like I did it. They don't call me 'blobby nobby' for nothing you know!