VPI Classic hum

96% of the hum is gone. No hum at all just listening to records through the phono section. I still get some (albeit at a very low tolerable level through my headphone jack) Cost $140.00 for a new motor. I'm still in the process of listening to a variety of records and checking things out.

What was the problem with the motor?

Vibration, which is picked by the stylus and transmitted through the phono section. If you remove the motor from its mount the hum (resonance) goes away. My motor vibrated a lot compared to the other motors that we checked. We had gotten it to the point that you couldn't hear the resonance through the phone stage, however when we connected my tape deck and monitored the source it was very audible. It was also very audible on the tapes that I made. I'm thinking that a stethoscope would be very useful in trouble shooting this. A shield cartridge may mask the resonance problem. If nothing else it cost very little to check the motor vibration out before springing for a cartridge.

Get out -- motor vibration. Wow. Now that's a first for VPI. The underlying premise of the Classic is that the machine is built like a tank and weighs like one too. The permitted inference is that the motor on your Classic must have been defective. If so, that would be disappointing because I would expect better QC from VPI.

If my inference is off base please advise because I would very muck like to be wrong.

Can anyone here explain why the Classic motor, when you turn it by hand you can feel cogging, just like a stepped attenuator. I have never noticed this before on any other tt motor.