As a long time reader and fan of Talkbass, I finally decided to chime in and ask you guys if you could help me with a problem I've been having lately: I've recently acquired a G&L SB-1 (1985). This is the one with the Schaller PBX pickups (pre-MFD pickups). I absolutely love the tone and playability of this bass. However didn't quite like the unwanted noise the PU picked up: There was a humming noise that disappeared when I touched the strings, but also a sort of high pitched whine. So, first thing I did was shield the bass (control and pickup cavity + pickguard) with copper foil to remove the unwanted noise. I also checked all the connections and solder joints; no problems there. So I closed the bass up and hooked her up: The bass was now free of hum (the one that disappeared when I touched the strings) but the high pitched whine was still there. Weird things is that when I positioned the bass facing a different direction in the room, the whine disappeared. Also when I roll off the tone on the bass the whine is gone or at least kind of muffled. I tried different cables, playing in different rooms (even the garden shed ), switching off computers and wifi routers and using different amps. It all made no difference; that annoying whine is still there. What did make a difference was plugging in a different bass. This one has a brand new Delano PMVC 4 FE/M2 in it and is dead quiet (same amp, same settings). BTW I use a Sansamp RBI and a Markbass Little Mark 250 into a SWR Goliath JR III. At this point I think the problem has something to do with some sort of external interference or maybe a power supply problem in my house. I think it is definitely related to the Schaller PBX pickup as the Delano pickup is completely silent. I guess my question is: Do you guys have any idea what might be the source of the problem? And if so, is there something I can do about it? Would you recommend changing pickups? I'm thinking maybe changing to G&L MFD or Dimarzio Model P pups, but I'm not sure if this will fix the problem or change the tone (which I love). I apologize for this long post, it is WAY too long, and for my mediocre English (which is unfortunately not my native language and probably the reason this post is so long ). Anyway, any input or similar experiences on this problem is greatly appreciated!