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VPI Ads (Analog Drive System)

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The ADS design includes two pure analog frequency generators featuring low distortion and noise; a high current Class-A/B amplifier that is transformer-coupled to the turntable output; analog control logic for low noise operation; 33/45 RPM analog speed adjustment controls with center detente positions that are factory calibrated.  Created by our Director of Electrical Engineering, Michael Bettinger.


The Machine:

  • The platter is started and stopped by the front panel Run/Stop momentary push button switch.

  • The front panel contains a two-position push button switch for selecting either 33 RPM or 45
    RPM operation.

  • There are separate speed adjustment controls for 33 and 45

  • The controls have a detented center position that is factory calibrated for 60 Hz (33 RPM)
    and 81 Hz (45 RPM).

  • The speed is  continuously adjustable +/- 3 Hz

  • Blue LED indicators adjacent to the controls indicate which speed is set at a glance.

Additional Specifications:

Line Voltage:                        115/230 VAC Factory set
Line Frequency:                   50/60Hz
Line Fuse:                             1 amp (Slo-Blo)
Output voltage:                   115/230 VAC Factory set
Start Voltage:                       120/240 VAC
Run Voltage:                         90/180 VAC
Output Frequency:              50Hz/60Hz Factory Set
Output Frequency Range:
60 Hz Center Detent: 60Hz @33 RPM & 81Hz@ 45 RPM
50 Hz Center Detent: 50Hz @33 RPM & 68Hz@ 45 RPM
Control Range                      +/- 3Hz
Output Power:                     15W
Dimensions:                         16” X 4” X 12” (W X H X D)
Weight:                                  10lbs

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