Mac1700/turntable issue

So running a piece of cheap speaker wire from the bottom of the arm to the ground reduced the hum by at least 50-75%. If I use thicker wire will I reduce it more? It is some much improved, I may let sleeping dogs lie. Or just buy a new 452 amp and a sweet pre.......
 
I doubt heavier gauge wire will make any difference. Are you still using the cables with built in grounding? If so, I would see if regular cables make for any improvement. Other than that, you may have to consider a different cartridge if the final result is still objectionable.
 
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