@markshvarts have you checked original notes from Luxman (dates April 26, 1978). It's for adjustment of unstable speed on PD441/444. here is a link to my google docs for this file: https://drive.google.com/file/d/0B7SnhzDV__cCb3BmSFZYU0xzc00/view?usp=sharing
Not sure if that's your problem, but just in case.
I have two PD-444 and it's amazing turntable.
Not sure if that's your problem, but just in case.
I have two PD-444 and it's amazing turntable.