TechDas Speed Issue

You need your dealer or TechDas to get involved.  There are no electronics geniuses here, much less even a run of the mill EE. I guess you should do the obvious checks, like is anything dragging on the platter?

You need to contact the dealer - TechDas (Japan) will tell you that as well.  Hopefully its a simple fix and you won't have to send it in.  

Dear @robob  :I don't know the age of your TT or hours playing it.

Maybe what could needs is a new belt and clean the metal parts where the belt drive it.

@rdk777  +1

Regards and enjoy the MUSIC NOT DISTORTIONS,

R.

OK,  I thought maybe somebody had run into the issue.

And no, nothing is dragging.  It is an air bearing with a separate compressor for the bearing and vacuum hold down.  The power supply and and speed controller are in a box with the compressor.

Y'all take care,
Robert

Robert 

Try to readjust speed again with belt tension - like from the beginning. Go with lowest tension as possible. 

Good luck!