Re: Geddy Lee Jazz pup replacement
you will need a set of humcancelling pickups in order to avoid the humming problem when the 2 volume knobs are not set equally. In general, humbuckers sound different than single coil pickups, but Nordstrands are loved by many:
http://nordstrandpickups.comYou could also check out bestbassgear.com for other brands. Another thing you may want to consider is that humbucker may have less output than single coils. To me, this is a fair tradeoff because the single coil hum drives me nuts, and I have an active preamp.