Hi all, first-time poster on talkbass. I recently installed a Bartolini 59J-L1/LN1 pickup set and NTBT preamp on my Carvin BB75. I like the sound of the pickups and preamp - pickups are slightly warmer and fuller on the low end and the low B seems to be stronger. However, I have noticed a small amount of hum when either the bridge or neck pickup is soloed (not present with both pickups on full). It is significantly less than single-coil hum, but still noticeable. I don't remember the stock Carvin H50N pickups humming like this. I know the 59Js have humbucking coils in a side-by-side configuration, as opposed to stacked configuration like the H50Ns. My theory is that since they are 5-string pickups, one coil is longer than the other (meaning, one coil handles 3 strings and the other handles 2) so that the two coils are partially - but not completely - humcancelling. Anybody else run into this or have any feedback/comments?