5
ANTI-SKATING:
One of the least understood forces acting on a tonearm is anti-skating. Skating force is
created by friction between the stylus and the record creating a force vector in a
direction towards the center of the record. Putting a stylus down on a flat grooveless
record will cause the arm to shoot in toward the center of the record. For years arm
manufacturers have been trying to compensate for this force knowing full well that it is
impossible. The force is constantly changing as the music and the velocity changes.
After very careful listening tests we have determined that
every tonearm we tried
sounded better with their mechanical anti-skating disabled and the tracking force
very slightly increased.
All mechanical anti-skate devices add a negative sound to
the music because they are made of parts that can vibrate. We solve the problem in a
unique way:
As mentioned earlier, the arm wire applies the anti-skating force. The degree of force
applied can be adjusted, to increase anti-skating force give the connector a
counterclockwise twist, unwinding the wires natural twist. Likewise, to decrease the
force, give the connector a clockwise twist, winding the wires natural twist. Remember,
the Lemo connector can only be "adjusted" in increments of whole turns. If it is not, its
key will not line up with the groove in the receptacle.
If you try adjusting the anti-skate with a grooveless record you will ruin
the twist in the wire and void your warrantee
This is all you need for anti-skating.
OVERHANG ADJUSTMENT:
This adjustment will yield the lowest overall distortion when playing a typical 12" record.
Do not go crazy over this adjustment. You do not know if the stylus is aligned properly
on the cantilever. You are also facing a constantly moving target when playing a
record. The arm is moving in 3-dimensions and will only approximate the accuracy you
have built into your alignment.
Loosen the two screws in the jig and place into position by sliding the “V” cutout
between the arms lateral balance weight and the platform that supports the armrest.
Put the hole over the center spindle of the turntable. Make sure that the jig's cutout fits
against and around the bottom of the bearing well. Retighten the screws.
Carefully swing the arm over the grid at the far end of the jig and place the stylus as
close to the dot in the center of the grid as possible. Using a lighted magnifier will
make this job very easy.
Be very careful not to damage the cartridge's stylus
AllegroSound.com
Summary of Contents for JMW 10
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