I have a Hamer Cruise bass with a 2TEK bridge and Duncan vintage J bass pickups. Just recently I noticed what would appear to be a ground problem. In many clubs I play the bass buzzes noticeably. Of course it quiets down considerably when my hands are on the strings. I play with both pickups at full volume. Originally I thought it had much to do with bad wiring, florescent lights, beer coolers and other electrical gremlins commonly found in bars. It never buzzed in my home or a controlled environment such as a recording studio, or so I thought. Earlier today I removed the control cavity cover hoping that some obvious problem would present itself to my novice eye. Seeing none I began screwing the plate back on. It was then I noticed a faint crackling sound coming from the amp. When I touched the plate with my other hand the noise stopped. The cavity is shielded and the pickups are single coils. There is a ground wire connected to the bridge. Any suggestions short of replacing the electronics? I also have a Vintage Reissue 57 P Bass with the original split humbucker. There is no shielding that I can tell. The instrument is completely stock. There has never been a noise problem with that instrument except when my fingers come in contact with one of the poles on the pickup. The instrument then produces a noticeable buzz that stops when contact with my hand stops. Since I play over the pickup the noise was unavoidable and unacceptable. As a temporary (or permanent solution) I placed a piece of electrical tape over the pickups. Any help, advise or insight into the cause and/or solution of these problems would be greatly appreciated.