iown a grado sonata it is a great cartrige brings out the inner details of the music but they are not shielded so any table that does have a isolated motor can get hum
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An inexpensive cure for the Rega/Grado hum problem
The motor and platter bearing **must** be grounded to the base of the tone arm. I have no idea why Rega does not do this, but it is effective. You do not have to shield the motor. I had to file off some of the finish on the motor in order to be able to solder to it, but the result was no more hum with either a wood-body or plastic body Grado.