So Weird- No Stylus Contact Woofer Pumping with Hana ML and Elac PPA-2

@lewm , there may be a magnet in the control loop under the platter. Very common approach. One thing is for certain. It is either something on the platter or the oscillating motor. The oscillations are perfectly rhythmic at 33.3/minute. I seriously doubt the mat. Who puts magnetic material in record mats? If its the motor that would validate my feelings about DD motors.

@dadawada , No it is not static electricity. Static electricity would not produce a perfectly rhythmic motion. Static can also not cause induction because there is no current flow to create a magnetic field. Any path to ground would short it out.   

I would be inclined to take a small magnet and run it over the platter to see if there is some point of attraction within the platter itself.  Simple test to do.  Very odd problem indeed.

@mijostyn static can build up on one section of the vinyl. As the record spins the area with static affects the magnets in the cartridge and causes the base to move in rhythm with the section moving underneath the cartridge.

As others have said, it could also be a magnet on the platter used to read and calibrate speed.

If it was a magnet on the platter, the problem would occur when the platter had no record or mat. If you look at the video, you’ll see that does not occur.