- Power regeneration
- Isolates turntable motor from external power anomalies
- Fine speed/pitch adjustment
- Reduces motor vibration
- Easy to read LED display
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The Synchronous Drive System (SDS) combines a turntable motor speed controller
and a line isolator into one convenient 16" x 3" x 12" (W x H x D) package. The
SDS breaks new ground in clean accurate power delivery using advanced digital
technology and quartz crystal accuracy.
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 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, 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 systems 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 changes it into pure
DC voltage and then digitally regenerates its own clean signal. This approach is
superior to that used in many of the other power line conditioners on the
market.
The SDS works best with synchronous motor driven 115 volt turntables, such as
those from VPI. The speed of a synchronous motor is determined by the frequency
it is fed. It is only logical then, that a device whose speed is based on the
line frequency will always function better when a stable frequency is delivered.
A 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 tumtables 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. |
