A query for you scientist types. My brother in law is/was a design engineer. designed machines for Metal Box. He took one look at my TT and said the platter should be much heavier to take advantage of the flywheel effect. My TT is based on a Sansui DD motor and the platter is extremely light but well damped.

I would have thought that the control systems would find it easier to regulate the speed if the platter was light. If there is a lot of mass, wouldn't the variations have a longer period as the corrections would take longer to be applied? This would then sound like a slow wow and be a disaster on piano music and the like.

Certainly, mine is rock steady and piano music sounds solid and decays naturally with no hint of any 'warblin' (Richard)