Teres Audio Verus Direct Couples Motor, Anyone?

Doug:

I had a similar problem to Chuck911. My O-ring arrived with a ridge that needed to be sanded. Even with sanding the O-ring produced noticible rumble when it hit the imperfections in the rim of the platter. Perhaps with a perfectly smooth acrylic platter it's not an issue.

Ken Golden

Dougdeacon, thanks for the explanation as to why you couldn't achieve speed stability. I guess that there are slight differences in the diameters of the various Teres platters. I believe we have the same TT, the 320. I must have been lucky with mine.

The Verus controller adjustment is in 0.16% steps. This means that the worst case speed error will be 0.08%. On average the error will end up being about 0.04%. Doug had a very early controller that used adjustment steps that were much larger. All of the controllers have been upgraded to use the finer adjustment steps.

A continuously variable adjustment scheme would be less accurate because analog circuits drift. You can get the speed spot on but does not stay that way. With the Verus controller you may end up with a small speed error, but it will stay exactly the same and does not need to be re-adjusted. It would be very difficult to get an analog circuit to remain within 0.04% over a long period of time.

Chris,

Thanks for the update. Glad to hear you made that change.

The invite's always open, assuming you can tolerate our choice of music! ;-)

I have added the Verus to my Teres 255 with the acrylic/lead platter just recently. But my belt drive motor was an old string type on an old motor.

To say there was an improvement is an understatement. I never heard a bit of rumble, and in fact the whole noise floor just dropped. However, I can't say how it compares to those later high end belt driven motors.

In my system there was no "feedback" noticeable, but again I didn't have the best belt drive setup to compare to. I will say that this motor isn't about making more depth and detail, it is mainly about making less fuzzy bass and midrange. And in my case there was some gain in depth and detail, just not what I would have expected from a precision motor upgrade. Maybe that is the "feedback" that blurs compared to the best TT's out there or maybe my tonearm isn't the best it could be. But that effect is so slight to me I am not hearing it at this point. The system resolution is not motor constrained right now.

As far as strobe speed accuracy, it's far more accurate than my ears can hear. I am almost tone deaf in that regard, in terms of absolute pitch perception. I couldn't tell 2% error in speed, or at least I would just get adapted to it quickly. But I could set the speed dead on long enough to say "good enough" for anything I will hear.

So for my case it was 100% gain, no loss whatsoever.

Kurt