Hey Scuba, that is certainly an issue. But, I don’t believe the preamp is the culprit. My first Sadowsky was an RV5. It was phenomenal, except that when I stepped on stage for this gig:
(ca 2005)...the bass / amp / FOH nearly exploded. The problem was that neon sign behind me. The solution for that gig was to balance the pickups and leave it there for the gig.
More recently, I was struck by the single coil bug again, acquired some beautiful Ulyate’s, installed them in my Jazz 5 w/ Sadowsky preamp; and bang, there was both the single coil sound, but also the single coil hum. Shielding in the cavities helps, but doesn’t eliminate it. My Delano JMVC5’s we’re back in four days later. The only solution I’ve heard is there is a preamp that Pat Wilkins uses, which includes a dummy humcanceller, kind of like the Alembic Series preamp.
it would be great if Roger could navigate an upgrade to his preamp to incorporate a dummy humcanceller under the pickguard. That would allow single coils with no hum. But, until that happens, we’ve got this trade off.
Don’t know if any of that helps or not.