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speed stability

Does anyone know if using a device like a PS Audio power regenerator accomplishes the same speed stability goal as using the VPI SDS controller? I have a VPI Classic turntable and run it, along with the rest of my audio components (except the power amp), through the P5 Power Plant. Since one of the goals of the P5 is to deliver a nearly perfect 120 volts, is an SDS superfluous?

Thanks!
128x128wynnosu
dkarmeli
334 posts
 
Hi Benjie, I never said that SDS or other speed controllers don't affect sound, of course they do. A stable speed with the correct pitch will have a positive effect on sound. And I agree that motor induced vibrations can have negative sonic effects. My comment was about reducing motor vibrations by dropping voltage. What are they dropping the voltage to? Does the SDS ramp up to over voltage and then drop down to the correct voltage or does it drop down to some nominal voltage like 40 volts?

Don't know about your TNT but none of my tt motors will work properly with significantly lowered voltage.
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rodrigaj
32 posts
 
Dkarmell-

The SDS will drop the voltage to as low as possible to maintain the necessary speed and frequency (user controlled). It does have a minimum specification is always reached: 72volt, if the motor is working properly.

You can see the unit change upon start up from 115V to the 72 volts at 33 rpm. At 45 rpm the voltage is 83V as I recall.

The user has no control over voltage, just frequency - which is set to a strobe such as KAB's.
dkarmeli
334 posts
 
Rodrigal and Benjie, thanks for the update.
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