Need to adjust the speed every time I turn on turntable

glennewdick

one thing to consider is your power going to your house changes a few volts all the time that alone will throw off a turntable with out compensation.

No, it won't. Turntables don't rely on AC voltage for speed regulation. The ones that use AC motors are synchronous to the line frequency, which is subject to only very tiny deviation by the very nature of AC distribution systems. Those that use DC motors employ regulation in the DC power supply.

I run mine through a PS Audio Power generator.  (P1000) Same Voltage. frequency every time. 
Also every time I put a tiny screwdriver in the adjustment screw the speed goes crazy.  I adjust and it goes back to normal again, and I can determine if it is improved.  Ground issue???

AC motors are locked to the drive frequency, but the wall power frequency does vary a small amount over short periods.  This will manifest itself as a wavering on single notes, but will not show up as speed drift over longer periods of time.  Long term speed drift is caused by changes in the belt and bearing lubrication over time and changes in stylus drag from the beginning of a record to the end.

The speed of DC motors is more difficult to control than AC synch motors.  Even with tight DC regulation of the voltage, the motor speed will be affected by torque load and temp.  Some of the OL motor controllers compensate for speed changes with load variation (stylus drag), but without temp compensation, the speed of the motor will still wander.
A synthesized PSU will lock the speed of an AC synch motor to a quartz reference, but as I posted above, this does not guarantee constant PLATTER speed.  Even with perfect motor speed control, the platter speed will drift over time.

I had stopped listening to albums because the speed fluctuations drove me nuts.  It was very audible.

I finally bit the bullet and sent it back to Sota for a new motor, board, speed control and maglev bearing.  The sound is now amazing.  I can clearly see that it runs exactly at 33.3 and it sounds just as good.

My advice, stop playing games with your table.  Either fix it or replace it.  DC motors get old.

@mijostyn, speed drift is quite common with origin live dc motor.  See the faq https://www.originlive.com/support/hi-fi-problems-troubleshooting/dc-turntable-motor-problems/