A friend gave away all his vinyl LP's some time ago, having transferred a lot to CD**. He has now discovered a box of LP's and tried to connect up a turntable to an amplifier. He rang me for help. I can't get to see him and it for some time, and he has no multimeter or other test equipment.
It hums. I am trying to guess whether a missing earth or an earth loop is the more likely problem. I assume and hope that both the amp and turntable chassis are earthed. At this stage no other equipment is connected and the amp is fine on its own. I am a bit reluctant to ask him to try poking an earth around even if I thought he was capable.
The turntable + pickup arm are a Rega Systemdek 2X2. My question is whether the pickup assembly is earthed to the turntable chassis or should it pick up its earth via the phono connection to the amp?
** He has always used a bizarre system where he plays the records through an amp into a DAT recorder. This automatically produces a DAT with track markers. He then connects the DAT to a CD recorder to produce the CD.