Get the KAB speedstrobe or another strobe and check the speed. Since you have the HR Power supply it's easy enough to adjust it. My Gyrodec was running about 1% fast prior to adjustment. But I never had a wow-flutter problem.
So, as has been mentioned:
--Make sure bearing is lubed and clean
--Clean your belt
--Clean the pulley an the groove on the platter
--check speed with strobe (you can also use a generic strobe disk from Vinyl Engine, with an incandescent light. Just not as accurate and a little hard to see)
--Try with the standard power supply to see if you have the same problem/issue
--Grab a piano album and make sure the notes don't sound 'sour' or vary during sustained notes
So, as has been mentioned:
--Make sure bearing is lubed and clean
--Clean your belt
--Clean the pulley an the groove on the platter
--check speed with strobe (you can also use a generic strobe disk from Vinyl Engine, with an incandescent light. Just not as accurate and a little hard to see)
--Try with the standard power supply to see if you have the same problem/issue
--Grab a piano album and make sure the notes don't sound 'sour' or vary during sustained notes