Rick Turner wrote:Have you tried grounding the brass bars? They should be grounded; they need not be replaced.
I'm pretty sure they are grounded, but I will make sure.
Does the noise get worse if you touch the brass or the mounting screws? If so, it's a shielding issue, see above.
It's hard to tell when it's all together as the mounting screws don't reach the surface of the pickup rings, they are just screwed into the bottom of the wooden rings.
If the noise changes when you turn the bass one way or another, it's a hum-cancelling issue. Does the bass have one or two dummy coils? In series with the pickups or electronically done with hum trimmers?
The noise is directional. The bass has one dummy coil which is electronically added to the other pickups via a PF6 card. It's pretty much a standard Series II setup. The main cavity could use some more shielding work, so that might be an issue as well.
Too little info for an accurate diagnosis.
I cut the magnets on a diamond saw and hand-guide wound those pickups probably on my first real winder...a sewing machine motor with a counter. Probably about 3,000 turns of #38 wire.
Thanks for making them! They do sound fabulous! Everyone who hears and plays this bass loves it.
I'll try running ground wires straight to the brass bars and see if that helps at all. If it is a hum-cancelling issue and I already have a dummy coil, I'm not sure what else can be done to improve the situation.