Check to see that the main screw under the spindle is tight. If not fully tightened at installation it can become loose resulting in a lower speed. Had this problem some time back. Need a coin to fully tighten it.
NJoy
NJoy
Michell Gyro Se running a little slow
I have noticed that some songs sound slower off my table than they should. This is most evident on Led Zeppelin's Whole Lotta Love, Simon & Garfunkel's Cecelia and The Smiths' Frankly, Mr Shankly. Most of the time, the difference is not noticeable, but on some songs I can pick it up. I'm not sure what the problem is. I have the external power supply but am not sure if that is the issue.