Best cartridge to reduce hum under $400 USD

Thanks for the input. If I understand this correctly, I don't think I am having ground fault problems, because when the cartridge is swung away from the table (past it's rest), the hum essentially disappears. Thanks all for the cartridge suggestions. I was actually considering the Grado Sonata Statment, but was concerned about the hum on the Platinum Reference. So you are saying the low number of windings on the Statment cartridges reduces hum from the motor? Even with greater need for preamplification? I think the statements are 0.5 mV.

That seems like a cheap solution, will try shielding and grounding motor. Even 50% reduction in noise would be a big deal. Thanks.

Yogiboy, assuming more weight is what's needed, your thoughts on adding weight to tone arm without changing character of the sound? I have fooled around with adding blutack to various places on a tone arm on adifferent table to reduce errant vibration and all that did was take the life out of the signal. Advantage was it sticks on its own! I suppose I would want to add weight roughly equally to both cartridge and counterweight ends? What are you suggesting I use, coins OK?

I was actually thinking that I needed a medium compliance cartridge for this medium weight arm - so adding weight for Grado seems counter to that? I think the arm weighs more like 15 grams fwiw. Again, your thoughts appreciated. I guess it doesn't hurt to try adding weight.

Thanks

Thanks Viridian.

Hello, Hum was significantly reduced by addition of Shunyata Venom Defender to AC line. Low frequency resonance still an issue on imperfect disks. Would like folks thoughts on these three low to medium compliance cartridges for the TD150mk2:

Zu/DL-103
Audiotechnica AT150MLX
Ortofon MC-3 Turbo

Thanks, kn

Update.  Tried Shelter 201 cartridge.  Improvement over Grado Platinum in terms rumble and a decent sounding cartridge but as soon as I tried with 45rpm recording it’s shortcomings in terms of arm match were laid bare.  Subwoofer went wild to point I was worried it might be damaged.

Replaced Shelter 201 with Audio Technica AT150Sa (which has replaced the AT150MLX in their product line).  Rumble problem fixed.  Not as romantic in the mids as the Grado out of the box, but not sterile either with what sounds like ruler flat frequency response, fast and detailed with very good bass and exceptional tracking.  I actually think this AT cartridge might be a giant bargain.

Thanks again all for the suggestions.