VPI Industries JMW-9T Manual de usuario descargar pdf (Pagina 5)

Setting the Anti-Skating – Two Solutions

Anti-skating is one of the least understood forces acting on a tonearm. Skating force is created by friction between the stylus

and the record, causing a force vector in a direction towards the center of the record when the headshell of the tonearm has

an offset angle. Putting a stylus down on a flat, groove less record will cause the arm to move toward the center of the

record. Arm manufacturers have tried to compensate for this force, but that is impossible because the force is constantly

changing as the music and velocity change.

VPI has conducted careful listening tests and determined that every tonearm we tried sounded better with its mechanical

anti-skating disabled and the tracking force very slightly increased.

VPI has a unique solution to anti-skating: the coiled wire of the JMW Memorial Tonearm acts as a spring and pushes the

arm back without affecting the sound quality. On the Signature version of the JMW-9 you now have the option of installing

a mechanical anti-skate for those that want it.

 Adjust the counterweight so there is no down force on the cartridge.

 Swing the tonearm toward the spindle and release it. The arm should swing out toward the outer edge of the

turntable. Usually this is all you need for anti-skate.

If you try adjusting the anti-skate with a groove less record,

you will ruin the twist in the tonearm wire and void your

warranty. Do this with the mechanical anti-skate if you want

that much anti-skate.

 If additional anti-skate force is needed you can go to the mechanical anti-skate supplied but not installed. Follow

the directions on the separate sheet for setting the anti-skate.

F. 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.

 Place the Alignment Jig into position by sliding the narrow end with the circular cutout between the arms lateral

balance weight and the platform that supports the armrest. Make sure that the jig's cutout fits against and around the

bearing well.

 While holding the one end against the bearing well, swing the other end (with the hole) over the turntable's spindle so

that the spindle holds the jig in place.

 While the arm is in its rest, loosen the screws that hold the cartridge just enough that the cartridge can be moved back

and forth.

 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.

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VPI Industries JMW-9T Manual de usuario Pagina 5