VPI ADS Manual

VPI ADS
Manual
Setup and Instruction Manual
VPI Industries, Inc., 77 Cliffwood Ave. #5D, Cliffwood, NJ 07721
http://www.vpiindustries.com

ADS Design and Functionality
DESIGN OVERVIEW
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 detent positions
that are factory calibrated for 60/81Hz; analog logic controlled run/stop switching with the output RMS
voltage @ 120VAC on startup, followed by a step down to 90VAC after an 8-second delay for quick
starting of heavy platters.
THE ADS: OPERATION
Operation
The ADS is intended to remain powered on during listening sessions, allowing the analog
oscillators to remain warmed up for lowest distortion. There is a separate run/stop switch to
control the motor operation, which is used to control the starting and stopping of the motor.
To operate the ADS apply power using the front panel power switch, power on is indicated by
the illuminated blue bar included in the switch. Next turn on power switch on the motor and
leave in the on position. The turntable is now started and stopped using the run stop switch in
the middle of the ADS faceplate. Speed is chosen using the 33/45 RPM switch.
When the run/stop switch is momentarily depressed the AC power is applied to the motor. The
initial power applied is 120VAC, after 8 seconds the voltage level drops to 90VAC which is the
run voltage. When 45 RPM is chosen and the start switch is momentarily pushed the platter
starts up as just described at 33 RPM and after 6 seconds switches to 45 RPM which then lowers
the output to the motor to the 90VAC run level. This sequence allows the ADS to quickly start
heavier platters to 45 RPM.
The ADS utilizes separate 60 Hz and 81 Hz oscillators to eliminate unnecessary switching
circuitry in the oscillator circuits for long term speed stability and low oscillator distortion. LEDs
indicate the Run/Stop condition and chosen speed. Speed adjustment controls provide a center
detent position that is factory calibrated to 60 and 81Hz +/- .02 Hz in their center detented
position. The controls also provide fine speed adjustment of approximately 3 Hz through
continuously variable linear adjustment controls.

Speed Control and adjustment
The front panel contains a two-position pushbutton switch for selecting either 33 RPM or 45
RPM operation. Pressing the switch either latches it in or releases the switch to its outward
position for 33 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 also continuously adjustable +/- 3 Hz for fine tuning of the
platter speed using a stroboscopic disk and 60 HZ light source. Blue LED indicators adjacent to
the controls indicate which speed is set at a glance.
Motor Stop and Run
The platter is started and stopped by the front panel Run/Stop momentary pushbutton switch.
There is an LED indicator the glows red when stopped and green when the platter is turning.
System power
There is an IEC power module on the rear panel to supply AC power to the ADS. The IEC module
contains a fuse drawer that holds a 1-amp slow blow fuse protecting the ADS from electrical
system malfunctions.
AC power to the ADS is controlled by the power switch located on the left-hand side of the front
panel. When the ADS is powered up, the indicator in the switch glows blue indicating the
internal power supplies are functioning properly.
Output to Turntable
The 125 VAC max output to the motor is supplied by the identified AC receptacle on the rear
panel. The receptacle output provides a maximum 15 watts. Higher wattage loads will seriously
damage the ADS.

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
Specifications subject to change without notice.

VPI INDUSTRIES- LIMITED WARRANTY
VPI Industries, Inc. (VPI) warrants the ADS against defects in materials and/or workmanship for
one (1) year from the date of purchase by the original retail purchaser. VPI's sole obligation under
this warranty is limited to the repair or replacement, at VPI's option, of any part(s) found to be
defective.
VPI’s obligation to repair or replace defective parts is the purchaser's sole and exclusive remedy,
and VPI shall not be liable for any direct or indirect injury and/or property damage arising out of
the use of the product or defect in or failure of the product.
This warranty does not extend to any unit whose serial number has been defaced or altered, or
any product that VPI determines contains a defect or malfunction due to incorrect installation,
modification, or misuse. Therefore, any evidence of overheating such as melted or charred parts
will be taken as evidence of misuse, or servicing by the purchaser, or service technician not
authorized by VPI to perform such service. It does not cover trivial or cosmetic defects that do
not impair the unit's normal function.
VPI reserves the right to make changes in this product without assuming any obligation to install
such change in any product previously manufactured without charge.
This warranty to repair or replace defective parts is in lieu of all other express or implied
warranties of merchantability or fitness for a particular purpose. There are no warranties that
extend beyond the description herein.
Some states do not allow exclusion of implied warranties or limitation of incidental or
consequential damages, so the above exclusion or limitations may not apply to you. This
warranty gives you specific legal rights, and you may also have other rights that vary from state
to state.
Register your Product Online:
http://vpiindustries.com/warranty/
VPI INDUSTRIES INC, 77 CLIFFWOOD AVE. #5D, CLIFFWOOD, NJ 07721
Email: [e-mail]
www.vpiindustries.com