I just bought a CR-1020. I have cleaned it and applied Deoxit. Tested it downstairs with several different speakers and a few different CD players and Cassette players. Nice quiet and clean sound. I installed it in my main system, and got a low hum from the TT. It is a Sony PS 5 direct drive. It was running fine on a Sansui, I had it grounded, but the issue appears on both the TT1 and TT2. The hum appears whether the TT is on or off, but not if the RCAs are not plugged in. I tried plugging the TT into another outlet, with no luck. All of the other functions are clean - even the Bluetooth adapter (Plugged into the Aux RCA). Suggestions? Thanks.