Yes, true, the newer SAMA from what I can see as well, is basically empty. Nothing inside, but a Foam Sheet isolating-seperating the bottom of Motor Case from the Run Capacitor.
But, the 600rpm Motor is not inheritly bad as far as speed stability goes, and if working properly, is not prone to the large degree of speed variation that you are appearing to notice.
So, with that said, yes, the Motor could be at fault, and I imagine if it is doable, one could then possibly opt for either the 300rpm Motor, or otherwise, a new 600rpm Motor should do the trick.
It will be VPI that may have to answer your questions, if the 300rpm Motor will be a simple swap, or will one have to modify the SAMA Case in order for it to fit? We can assume that a different Pulley would indeed be needed. The question is, does VPI have the correct Pulley that will work with a SAMA. Meaning, will it be long enough to protrude far enough, and up through your Plinth to reach alignment with Platter? That is an unknown to me?
Having to glue the pulley, I then assume you once had either slippage, or wobbling of the Pulley, to require gluing it to the Shaft?
I think we can all agree, that the Base on which your Table, and SAMA rest upon should not be an influence of the Motor's speed stability, that this would be caused by something else? But what?
The only other influence that I can think of, in regards to speed fluctuation, would be the VPI SDS at fault? One would have to test the SDS to find if any fluctuations in voltage and/or line frequency are taking place?
Mark
But, the 600rpm Motor is not inheritly bad as far as speed stability goes, and if working properly, is not prone to the large degree of speed variation that you are appearing to notice.
So, with that said, yes, the Motor could be at fault, and I imagine if it is doable, one could then possibly opt for either the 300rpm Motor, or otherwise, a new 600rpm Motor should do the trick.
It will be VPI that may have to answer your questions, if the 300rpm Motor will be a simple swap, or will one have to modify the SAMA Case in order for it to fit? We can assume that a different Pulley would indeed be needed. The question is, does VPI have the correct Pulley that will work with a SAMA. Meaning, will it be long enough to protrude far enough, and up through your Plinth to reach alignment with Platter? That is an unknown to me?
Having to glue the pulley, I then assume you once had either slippage, or wobbling of the Pulley, to require gluing it to the Shaft?
I think we can all agree, that the Base on which your Table, and SAMA rest upon should not be an influence of the Motor's speed stability, that this would be caused by something else? But what?
The only other influence that I can think of, in regards to speed fluctuation, would be the VPI SDS at fault? One would have to test the SDS to find if any fluctuations in voltage and/or line frequency are taking place?
Mark