Often, it is the motor, not the bearing. Take off the belt and turn the motor on. If you hear the grinding it's the motor. Likewise, remove the belt and with the motor off spin the platter by hand. If you hear the grinding, it's the bearing. Two more tests. While the platter is spinning, if it spins for a long time with a continuous, unimpeded motion then it is probably fine. If you have a record with a silent groove play it at high volume and listen to the rumble, if it is not prominent then the bearing is fine. A lead-in or lead-out groove can be used for the rumble test but ya gotta be quick. If it's the motor AR had some for sale last year so they probably still do. If it's the bearing give them a call and they may have a new one.
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