Hum from Florescent light

Trelja, I know this may sound whacky but try turning around your interconnects. Some of them have the shield grounded at one end only. If the shield is not finding a connection to ground it is not serving as a shield at all. Give it a try. If it works it will be the least expensive tweak you have ever made, if not I am afraid new interconnects may be in your future. Let me know if you have any luck.

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!

Perfectimage, your problem is not RFI and I doubt isolating the light will help either. The key here is the word HUM, which almost anyone with knowledge of electronics relates to 60Hz energy. RFI filters are for filtering RADIO FREQUENCY INTERFERENCE not 60Hz hum. Your problem is radiated 60Hz from the flouresent light. Flouresent lights have been known for years to be radiators of 60hz energy. Incandecent light is a much better choice or move the flouresent as far away from your system as possible. Spending lot's of money on fancy RFI filters and isolators will only lighten your wallet and not fix your problem.