I have a Elac Miracord 45 that is running into a Realistic STA-80 amp. The turntable produces a hum on the right side unless I remove that AV cable. When I reinsert the cable, there is a louder hum and then the speakers work correctly. They'll work through the entire album but, when the turntable drops another album the hum returns until I remove/replace the AV cable again. Neither the radio or connected tape and cd players produce the hum. Am I just dealing with a bad cable on the turntable or is there another issue? Thanks for the help as it's driving me crazy!