VPI Ads (Analog Drive System)

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 RPM.

• 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