Origine
MkII
Owner’s Manual Oracle Audio Technologies
16
Adjusting the stylus azimuth
Note:
Make sure the anti-skating cylinder string is set over the support hook and not resting loose behind
the tonearm as this will negatively impact the calibration. The platter leveling MUST have been done prior
to testing or correcting the azimuth.
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The Azimuth calibration is achieved by rotating the ¼ - 20 threaded set screw located laterally in the
tonearm head using the
supplied 3/32” Allen wrench.
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Rotating the set screw in a clockwise direction will make the tonearm tilt slightly towards the center of
the platter. Rotating the setscrew in a counter clockwise direction will make the tonearm tilt slightly
towards the outside.
Note:
There exist a variety of precision measurement devices that can be used to calibrate the azimuth of a
stylus. If you do not have access to such devices, please proceed with the following steps.
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Place the calibrator disc on the platter.
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Cue down the tonearm so that the stylus is in the middle of the black rectangle.
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Adjust the azimuth set screw until the reflection of the stylus on the black surface continues in a
straight line extending from the stylus itself. Understandably this observation is done looking exactly
straight in front of the cartridge and using a magnifying glass may greatly help.
Adjusting the anti-skating:
The objective of adjusting the anti-skating mechanism is to counter-balance the centripetal force
dragging the tonearm towards the center of rotation of the disc by applying a rotational force on the
tonearm’s axis using a weight measured in grams. The resulting centrifugal force should completely
cancel the centripetal force resulting from the stylus friction with the record groove leaving the
tonearm and stylus perfectly still, laterally, in the grooves. A properly adjusted anti-skating
mechanism prevents channel imbalance and undue stylus and record wear. There are a few ways to
test the anti-skating action. We use the plain surface (the unprinted side of the Calibrator disc) to
simulate a vinyl record with no grooves.
.
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Position the Calibrator disc on the platter over a record with the blank side facing up.
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Make sure the string of the anti-skating cylinder is looping over the support hook.
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If not already done, remove the stylus guard
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Cue the tonearm down in the middle section of the Calibrator disc.
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If the tonearm is moving inward the anti-skating force is insufficient. Add one of the supplied 0.25
gram stainless steel pins anywhere in the cuing cylinder and try again.
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If the tonearm is still moving inward place a second pin opposite to the pin you previously installed.
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Repeat the process until the tonearm starts moving outward. When it starts doing so remove one
pin.
