Hello everyone: I have a vintage Mission Cyrus 2 integrated amplifier that is working fine but when switched to the phono input and the volume control turned up, the hum is terribly loud. When playing a record, most of the hum is masked by the music but I could not believe how loud it was when I heard the amp without a record being played. The hum is even louder when the phono inpuit is set to MC. Since I use it with a Rega Planar 3, the Rega doesn't have the ground lead. Is it possible that it is the lack of the ground lead that is causing the problem? I use my audio setup with a Chang Lightspeed line conditioner although my house mains is not earthed. Could it be that the amp is faulty? How common is this problem? Any advice will be appreciated. Thanks.