Whoa, good work! I've played several Newark Street basses but never in a quiet environment or for recording, so I never noticed anything more than the expected single-coil 60cycle hum. I did own a NS SF-III 6 string guitar, but was never bothered by noise. Granted, the SF-III guitar has humbuckers. I also deal with the fact that our old house does not have the best wiring, so everything is a little noisy (actually the previous house I lived in had the same issue, so I've learned to just ignore it).
Slightly related, slightly veer, I recently picked up a late 1999 Epiphone Rivoli II bass, which I am quickly falling head over heels in love with. 20 years ago these were made in the Peerless factory in Korea, which is known for putting out some truly excellent instruments. This bass was no exception, other than the fact that the chrome cover on the big neck humbucker had to be attached to ground. I was already modifying the "baritone" circuit (which I found features an inductor underneath the neck pickup) so it was a quick and easy fix to run some wire from one of the big fat mounting screw holes to the ground. Problem solved, but again, a tiny feat compared to the deluxe electro-shield-sausage!