You said that the tuner in your Marantz stereo receiver does not suffer from the hum problem. That further suggests the hum problem you hear during phono playback is caused by AC power line hum and not radio frequency (RF) interference from the LED lights and\/or the dimmer.\n\nWhere is the antenna and antenna line for FM radio reception located? Is it near the Marantz receiver, or is some distance away? The antenna line probably does not run near the LED light power line, or it might also pick up that hum.\n\n\nI don't have an antenna line hooked up. It grabs the signal on its own.