I own the Walker Motor Controller and would not be without it or some analagous device. A proper motor controller will not only help to maintain a stable speed but also causes the motor to run more smoothly with therefore fewer vibrations and less mechanical noise. This may be one reason why the benefits are so obvious. The fact that your table may run at exactly 33.3 rpm off the wall socket is not an indicator that you would not benefit from the addition of a motor controller, for reasons cited above. One other benefit, in at least some installations, is that a well-designed MC prevents electrical noise generated by the tt motor itself from leaking "backwards" into your AC circuits and possibly contaminating, for example, the AC that goes to your preamp.
