See this: http://www.audioannex.com/showthreaded.php?Cat=&Board=4&Number=58326&page=0&view=collapsed&sb=5&o=0And my response to that: http://www.audioannex.com/showthreaded.php?Cat=&Board=4&Number=58329&page=0&view=collapsed&sb=5&o=0
I do not believe that there is something wrong with the turntable. I strongly believe that the problem is due to improper grounding (I tried a few ways, except the one that you suggest me not to try).