Check out what can be done by power line conditioners. For example, VPI's SDS operates by taking wall power and generating its own output sine wave, much as an amplifier creates music from wall current. The SDS allows the user to vary the frequency of its output power, not just for fine tuning turntable speed, but also with a switch that allows you to go from 33 rpm to 45 rpm. There are other power line conditioners for turntables, but I have only had personal experience with the SDS. Aside from the convenience, you might ultimately also want a power line conditioner because they are said to improve the sound.
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