Need Some Assistance With Rega related Issue

@noromance - I can honestly say I think it sounds the same at 33 rpm.

The SRM Tec Deluxe Acrylic Platter for Rega comes with a large "rubberized band" that fits the outside edge of the platter to subdue unwanted micro vibrations in the platter

The original glass platter did weigh more than the acrtlic platter, so I added the sorbothane to the understide of the platter to give it some added "heft" -

Since I did not really play 45 RPM that much back then I didn’t test 45 rpm at that time of applying the sorbothane

Fast forward to today and i now have more 45 rpm albums, That’s when I discovered the issue - I thought it was the belt, but that was not the case.

Thinking back - I had the Mission sorbothane mat on the glass platter and it played without incident. But that was also with the original motor.

Perhaps there is something different about the Rega motor upgrade kit I installed?
- different control circuit - could that effect torque?
- Different motor - could it have less torque?
- who knows

The issue has been resolved to my satisfacton and it is sounding very nice at 33 and 45 rpm,

But it had me wondering there for a while :-).

Regards - Steve

Does it sound better at 33 without the Sorbothane?

Sounds like you found the problem pretty much on your own. But if I had helped in anyway, then you are very welcome!
Cheers, and happy listening!
Tim

@mr_m - THANK YOU :-)

Your post prompted me to grap the pulley while it was turning to see if it was loose...

If you prevent the pully wheel from spinning the motor shudders.

The shuddering from the motor was about the same frequency as the weird speed variations I heard when listening to 45rpm albums

I then remembered I had added some extra "mass" to the underside of the platter in the form of a layer of sorbothane to absorb platter vibrations.

The additional torque placed on the motor by using the larger pulley was just too much for it and the motor shuddered causing some crazy "flutter".

I removed the sorbothane and voila! - real 45 RPM !

Many Thanks - Steve

Your problem is a strange one. Pulley isn't slipping on it's shaft, is it? I use to own Rega 'tables and still like their designs. I think they used some sort of super glue to bond the pulley to the motor shaft.

Did you try calling Rega or their importer directly?

P.S. - I am using ISOkinetic Bearing oil - so I’m wondering if it is too thick/thin for the Rega Bearing

It sounds like really bad wow and flutter and it does not run at 45 - more like 40 rpm

33 rpm is spot on because it matched the digital versions exactly 

Cheers