How about phonostage? It should have ground at least. If not try to simply tape it to chassis see what happens.
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Could be that your phonostage is too close to your integated.
A while ago I moved around my equipment because of a new addition to the system and found that I could not put my phonostage close to my preamp or my new DAC. It was not an issue before as it was not near the preamp. I found a new spot next to my TT and all is happy now.