My project debut 2 has some irritating hum sound through left channel. In fact, after a week of digging, i discovered the noise is created from the metal turntable platter. If I touched the platter, humming noise was getting weaker. I am not sure it is related to grounding issues or it is the statics created by the platter, spinning for years and the platter turned up to be a magnetized metal. Once the needle played toward the mid of the record, the noise was getting louder. My turntable is an old version of UK plug (2 ways plug) and the phone stage is Onkyo with 100W japanese power plug (also 2 ways plug). The ground is connected to Onkyo grounding plug that I am not sure it does help grounding the statics and electric successfully.
Please advice how to fix the humming noise. Thanks.