Fortsettelse av føljetongen om antiskating. Her er Van den Hul sin forklaring på hvorfor VdH pickupene trenger antiskating eller bias lavere enn VTF:
The anti-skating force is necessary when you use a regular tone arm. So those few and proud owners of a linear
tracker can read but don’t need to be bothered.
The static anti-skating force is a minor force that pulls the arm to the outer rim of the groove during playing. This to
compensate for the moment of force caused by the friction of the stylus in the groove (the force) and the moment arm
(the distance between the tip and the vertical bearing).
So, many arms have a little device close to the vertical bearing at their rear to compensate for this moment of force. As
you will remember from your great physics lessons, two moments of force compensate each other when their direction is
opposite. So playing causes a moment of force in clockwise direction and the compensating correction is automatically
counterclockwise. It was a wise decision by the way to compensate. But as usual there are always new problems created
when you try to solve old ones.
One is the fact that music never has the same loudness, or stated otherwise, a record never has a constant amplitude or
frequency. So a static compensation (the anti-skating force) has to deal with a dynamic problem. It doesn’t work well but
it works better than no action. It depends on the difference in friction between the tip in a blank groove and the
modulated tip how much you have to compensate.
Round, spherical tips have much more friction in the groove (they really don’t fit well there) compared to special shapes
like our VDH type 1 or VDH type 2. So it depends on the shape of the contact area between the stylus and the groove how
much you have to compensate. The higher the frequencies cut in the record groove, also the higher the friction. For
conical shapes (somewhat old-fashioned today and only mounted in cheap systems) the anti-skating force setting should
be equal to the tracking force. With more groove-shape adapted stylus designs the anti-skating setting can be less. When
a cartridge uses the VDH type 1 or VDH type 2 stylus, the anti-skating can be adjusted at 1/3 of the tracking force. This
assuming that the scale on the tone arm is correct. Otherwise you have to listen to the sonic results.
When the anti-skating setting is too high, the violins in the left channel on a record with classical music will distort during
loud modulations. This is caused by missing contact between the stylus and the left groove wall. And when the antiskating
setting is too low, the violoncellos will distort due to the missing contact between the stylus and the right groove
wall. Keep in mind that a too high anti-skating force will give asymmetrical tip wear on the outer part of the stylus. I.e. the
lifespan of the stylus is shortened by a too high anti-skating setting
As you see a long story about a small topic. But it is vital for pleasant listening that the settings are done well.
Dette er tatt fra VdH sin utmerkede Phono FAQ pdf som ikke lenger ligger helt fremme i dagen på VdH sidene. Dette er et av de mest informative og best forklarende dokumenter jeg har. Anbefalt lesing for alle vinylhuer! Du finner den her:
http://www.vandenhul.com/faq/general/phono-cartridges-faqs