2. analog
  3. 135398-81

VPI ADS Versus SDS

Gents:

Has anyone "upgraded" from the SDS to the ADS? I've had a two VPI tables over the past decade and have always thought about but never tried one of their speed controllers. I'd be interested in hearing from folks who have used both models and can share comparisons. I've noticed that despite the introduction of the ADS there has not been a significant price drop of the SDS on the used market, which leads me to wonder whether the ADS offers a significant increase in performance. Also, I had heard that VPI was going to launch several ADS models but it seems there is only one currently available. Anyone know about plans for other cheaper or more expensive versions?

In general, what can you expect when you add a speed controller (either model) to your analogue playback system?

Thanks!
dodgealum

Showing 2 responses by tomwh

tomwh
150 posts
 
The reason for many controllers,  A/C sycro motors, is to stabilize frequency.  The reason some have voltage drops is to lower the vibration of the motor.  Also a big plus is to vary the frequency to get the right rpm.  Lots of things vary the rpm.  A two phase unit would be nice for the hurst motor Vpi uses.  Get rid of the cap and dial in the phase.  

To believe that speed stability is not critical is to Completely miss the point!!!  

Enjoy the ride
Tom
tomwh
150 posts
 
My Opinion is that speed stability is about off-center holes, not A/C frequency.

If you have a a/c sycro motor Any change in frequency with result in a change in speed.  Voltage drop only reduces the power and sometimes the vibration.

If you can not hear the improvements that  some controllers can make you can save some money.  If you want to state most are over priced that's a economic debate.

If you can build electronics there is a on going diy project on the diy forum.  It all started with a guy who wanted to 2 phase drive a Hurst motor on his VPI. Then Bill, the designer of Phoenix products, jumped in and you can have a unit that can run 1,2 and 3 phases.  It also automatically reduces voltage and many other features.

Enjoy the ride
Tom
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