VPI SDS Speed Control Device is a HUGE Upgrade for Your VPI Turntable!

The SDS Allows Dead-On Accurate Speed for Perfect Timing and the Lowest Possible Wow and Flutter. 

VPI's Synchronous Drive System (SDS) combines a turntable motor speed controller and an AC line isolator into a convenient and compact package. The SDS breaks new ground in clean accurate power delivery using advanced digital technology and quartz crystal accuracy.

Simply plug your VPI turntable into the SDS and hear the improvement a proper motor drive will create; solid and deeper bass, smoother midrange, sweeter highs, lower noise floor and deeper imaging. The SDS allows for proper calibration of platter speed, ensuring that not only does your VPI table spin at a constant speed, after calibration it will also spin at the correct speed! The SDS allows for individual speed corrections for LPs and 45s, in increments as small as 0.01Hz. The ability of the SDS to make such fine corrections, allows the user to truly "dial-in" the performance of his VPI table, regardless of model.

The SDS allows for the adjustment of both the voltage and frequency fed to the turntable motor. Adjustments are easily made from the front panel using intuitive, soft-touch controls. The selected output voltage and frequency are shown using large, easy to read LED displays. The SDS slowly ramps thevoltage and frequency up or down to the selected value in order to prevent premature motor wear due to abrupt changes. During motor startup, the SDS increases its output voltage in order to bring the platter up to speed quickly. Once the desired platter speed has been reached, the SDS ramps the output voltage down in order to reduce motor vibration and, therefore, the system's noise floor.

The circuit used in the SDS provides an incredibly accurate line frequency of great stability. Additionally, the electronic circuitry effectively isolates the output voltage from the input voltage, doing away with voltage spikes, low level fluctuations, RFI, and frequency variations.

Instead of merely filtering the power line, the SDS first converts it to pure DC voltage and then digitally regenerates its own clean AC signal. This approach is superior to that used in many of the other power line conditioners on the market.

The SDS is designed to work with the AC synchronous motors in VPI turntables. The speed of a synchronous motor is determined by the frequency it is fed. Logically, a device whose speed is based on the AC line frequency will function better when a stable consistent frequency is delivered. Constant motor speed translates into a quieter, more faithful musical presentation.

COLLECTORS ALERT: Many historical recordings were not transferred onto modern records at the proper speed. Using the SDS, you can now correct the musical pitch of these recordings by varying the speed of your turntable. In addition, collectors who have VPI turntables that run at 78 RPM will be able to accurately adjust them to compensate for the wide variation in recording speed used in the 78 RPM era.

Specifications:
WHD: 19x3x12

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