Best cartridge to reduce hum under $400 USD


I am currently running a Grado platinum reference on a stock Thorens TD150 mkII and Grado phono preamp. I like the the music it produces, but on my new Arcam - Monitor Audio - B&W based system I am noticing the hum a lot more. The hum increases as the cartridges swings towards the center of the platter, so I am assuming the unshielded cartridge is to blame.

With the b&w sub I am also now noticing more rumble, which may also indicate the cartridge is the wrong compliance? If I recall correctly, the tone arm is medium weight, something like 13 grams.

The phono stage has high and low level settings, but not sure it can effectively handle low very output MC.

Any suggestions?

kn
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The Grado Statement Platinum is a lower ouput [ 1.5 mV ] brother to Reference that was produced to combat your problem . It costs the same . Make sure your Phono Stage is up to the low output .
I'm think the 1.5 on the Grado Statement Platinum is the
tracking force not the output.
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.
..sounds to me like your getting hum from the turntable itself. Grados are especially sensitive to hum like this. Call Grado for help..they have some things that may help.
The Sonata comes in three versions. I use the Sonata with 1.5 mv output which is known as the Sonata VPI version. Call Grado and they will give you the info on this.