Hum Isolation Suggestions.

I recently change my amp from ARC tube amp to a Classe solid state amp because the tube amp stopped working and need some repair. The table after reconnecting to the pre amp has a slight hum, and after connecting the ac power cord of the table to ac source, the hum is even more severe. (The table has a ground lead to the pre amp, and is connected.)

Any suggesions would be greatly appreciated!