Hodie,
Thanks for the post because I too hear it sometimes.
I attribute it to the spindle hole not being perfectly center on some recordings and the platter having a slight wobble (up & down by a 1/32") every rotation thus affecting the tracking force.
Take a close look at the headshell & see if it remains perfectly level for each rotation.
Just a hunch.
Steve
Thanks for the post because I too hear it sometimes.
I attribute it to the spindle hole not being perfectly center on some recordings and the platter having a slight wobble (up & down by a 1/32") every rotation thus affecting the tracking force.
Take a close look at the headshell & see if it remains perfectly level for each rotation.
Just a hunch.
Steve