HiI recently got a turntable, a Marlux MX-86. The arm should be of decent quality and its equipped with an Excel ES-70E cartridge. I also have what I believe to be an Ortofon OM5E. The screws on ...

Which turntable and cartridge are you using? Have you tried them previously on a different receiver with no hum or noise issues? I just did a bit of Google surfing on that pre-amp and saw some ...