Music Hall mmf-7 spins faster

Are you sure the belt is in the right groove on the motor? One is for 33 1/3, the other is for 45rpm.

It is indeed in the right groove, Eddaytona: the smaller one (and the larger one, as indicated, when I am using the Speed Box II).

And, Stefanl, thanks: I will try your trick. However, I am still not sure why it would spin faster: on the Billie Holiday LP "Songs For Distingué Lovers" (that I know very well), although the instruments may appear to be playing at the correct speed/pitch, Ms. Holiday's voice is almost unrecognizable, as if all the "low-toned hurt" in her voice was nowhere to be found. On Pat Metheny Group's LP "Offramp", it's like Metheny's guitar (or Lyle Mays' piano) is playing a third faster than what was recorded. And I am very familiar with these recordings, be it on tape, LP or CD. Very frustrating indeed!...

You could also be running on a 'fast' bearing,meaning you need to add some oil to the bearing well.This occurs when a turntable bearing spindle has run out of lubricant and runs too fast,metal on metal.A few drops of oil or whatever is the recommendation by the manufacturer will cure a too fast problem also.Good luck!

Have you put a strobe disc on it to "visually" verify that is running fast?

Misc. thoughts:
-Could this be caused by unusually high voltage?
BTW, in which country do you reside?
Are you using a 115 volt model on a 220 volt system?
-Are you using a Music Hall belt or something else?
-Are you using an analog preamp or is the signal being converted into digital first (with some kind of pitch adjustment after)?
-Is this effect happening to ALL of your albums?
-How long has this been happening (is this a new TT)?
-Is your motor "in the hole" of the plinth or is it outside somehow (stretching the belt)?

P.S. I'm a MMF-7 owner also.