VPI SDS - Synchronous Drive System

Description

Perfect working order and cosmetic condition.  This unit was babied, no blemishes I can see, like new.  Guaranteed to arrive in perfect said condition.  I believe these are now discontinued.
I will cover domestic insured ground to Con US.
VPI SDS Synchronous Drive System Speed Control Device Provides Dead-On-Accurate Speed for Perfect Timing and Lowest-Possible Wow and Flutter From Your VPI Turntable
Designed to vastly improve the performance of any
VPI
turntable, the
VPI Synchronous Drive System Speed Control Device (SDS)
combines a turntable motor speed controller and an AC line isolator into a compact component that yields vital enhancements to the overall analog sound. Simply plug your
VPI
turntable into
SDS
and hear the improvements a proper motor drive creates: Solid and deeper bass, smoother midrange, sweeter highs, lower noise floor, and deeper imaging.
SDS
allows for proper calibration of platter speed, ensuring that your
VPI '
table spins at a constant speed and, after calibration, operates at the correct speed. In addition,
SDS
provides individual speed corrections for LPs and 45s in increments as small as 0.01Hz. Such fine-tuning affords the listener the ability to truly "dial-in" the performance of any
VPI
turntable.
How SDS Works, and What It Does
SDS
breaks new ground in clean, accurate power delivery via advanced digital technology and quartz crystal accuracy. It
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, legible LED displays. SDS slowly ramps the voltage and frequency up or down to the selected value in order to prevent premature motor wear due to abrupt changes. During motor startup,
SDS
increases its output voltage in order to quickly bring the platter up to speed. Once the desired platter speed is reached,
SDS
ramps the output voltage down in order to reduce motor vibration and, therefore, the system's noise floor.
Removes Voltage Spikes, Fluctuations, RFI, and Frequency Variations
The circuit used in
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,
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.
Works With All AC Synchronous Motors in VPI 'Tables
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.
Attention Record Collectors: Finally Enjoy the Correct Musical Pitch
Many historical recordings are not transferred onto modern records at the proper speed. Using
SDS
, you can now correct the musical pitch of these recordings by varying the speed of your turntable. In addition, collectors that have
VPI
turntables that run at 78RPM will be able to accurately adjust them to compensate for the wide variation in recording speed used in the 78RPM era.