Make sure all your components are plugged into the same
grounded circuit/power strip. Buy an isolation transformer-connect it to the same circuit, you can power up only one of your components from the isolation device, otherwise you may loop the hum thru the transformer. Try each component until you either eliminate the hum or strike out. If you have balanced outputs/inputs from your pre to your amp use them. If you have a cable connection to the system purchase an inexpensive isolation transformer for your cable box {www.partsexpress.com}-- good luck-
grounded circuit/power strip. Buy an isolation transformer-connect it to the same circuit, you can power up only one of your components from the isolation device, otherwise you may loop the hum thru the transformer. Try each component until you either eliminate the hum or strike out. If you have balanced outputs/inputs from your pre to your amp use them. If you have a cable connection to the system purchase an inexpensive isolation transformer for your cable box {www.partsexpress.com}-- good luck-