I've been getting a very noticable electric-sounding hum while playing records on my Technics SL-5 turntable. After some research, I've found out that this is probably related to my grounding. Unfortunately, I don't know what grounding the turntable actually requires me doing. If someone could shed some light on this subject for me I'd appreciate it. I'm currently using a Kenwood KR-A20 reciever, though I've tried other recievers with the same results.