[Richard Davis]

Thanks.  Because of your direction I think I have found the problem.  It will be a while before I can test.  I watched the video about the RCA and DIN connections to the relay (mute) board.  It included a wiring diagram and picture of how everything should be wired.  My unit has the chassis ground wire, shield, and signal return all tied together.  The proper way shows the signal return and the chassis isolated by a capacitor.  I will rewire and test once I get my turntable put back together.  I am amazed by the quality of the resources on this site.  Thanks to everyone involved.

[Richard Davis]

Hi.  Thanks.  I am in the US.  The unit is a type 5523 and came supplied with RCA connectors.  I’ve had the problem for decades and is independent of what it is connected to.  I recently replaced the ground wire with a thicker one but I still have the problem.  If I disconnect the ground wire completely the hum gets really loud (louder than the audio).  As it is, when I listen through headphones everything is quiet until the TT unmutes when the arm drops.  That is when I hear the hum.  Music on the record will mask the hum until it gets between tracks on the record.

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