Ants: Full-charged Roughcast A2 worked wonders. A3neck/UOA5bridge was a good combo in a jazz box. I've tried the A4n/A8b but they didn't sound "vintage" no more.
'59s: it doesn't matter what magnet you put in, they just REFUSE to sound BAD. These together with the Custom wind are my all-time favorites.
Custom 8: the HOLY GRAIL of bridge p'ups. The absolutely most versatile bridge p'up known to mankind. Goes perticulary well with an A4'59n in the neck, but A2 and UOA5 work great too, just give different flavors to the table,so to speak.
The best-sounding Duncan neck p'up for me is the A4 Seth Lover neck.
For Jimmy Page's guitar tone in Presence the UOA5 Seth Lover set nalis it so close it's scary.
Get a small load of magnets and swap away to your hearts content! That's the best way to fine-tune the guitar to the rig.
What I'm going to say may seem heavy cork-sniffering, but my experience is that every time you swap a magnet, it takes time to the new magnetic structure to PERMEATE the components, so wait at least a couple of days to judge the outcome, as what's what it takes in average to the magnetic field to stabilize.
I can't prove scientifically, and it may just as well be "placebo effect", but I only can say it REALLY happens, as it happens ALL THE TIME; the stronger magnets take less time to stabilize than the weak ones. The last time I've modded a '59n with an A3 took over a week to stabilize.
Back to my meds refill...
