Phono stage hum

Correction to my last.  The Ortofon arm is a TA 110.

I too have a Thorens TD 160 (Mk I) that is now out of service but at one time was suffering from a hum problem. Somewhere I found instructions for a cure which involved altering the grounding scheme on the rudimentary power strip inside the plinth. It was a snap to perform and worked. So yes the problem probably is turntable specific. 

It seems I found the cure on either Vinyl Engine or more probably, on a vintage Thorens website. I will see if I can dig up the info but it did get rid of the hum...

Brock

Well, my Grover phono cables arrived and did not solve my hum problem.  I did, however, track down the source of the hum.  Much to my embarrassment I had reversed the left and right ground wires on my cartridge.  I reversed them and the hum was gone.  OP might want to check this.

P.S. The Grover cables were a nice upgrade.