Trelja, Sorry, just had another thought pop into this thick skull of mine. If the interconnects are connected to your preamp this may be worth a look. On my preamp there is a terminal for a ground connection. Verify that you have a wire connected between earth ground and this terminal. From your previous posts, I know you are very knowlegable so I know you probably have this connected, but maybe it is loose or fell off. If the ground wire is not connected or loose, the interconnect shields may not be getting grounded. Just another thought my my warped mind. Good luck!