Ancient AR Turntable with NO anti skate

Al,

Yes, that is exactly what I meant.  I find that on my Dual 1229 / Grace 747 setup (Denon 103) that I too can easily find a place when adjusting the anti-skate where there is no perceptible deflection of the cantilever, but on my Garrard 301 / SME 3009 setup I can't.  This one is also using a Denon 103. 

I set my anti-skate by playing a blank clean record side (one of Stereophiles).  What I do is play the record and set the arm down after making a crude anti-skate adjustment.  Then depending on the direction of the arm I adjust the anti-skate to where at any point on the record I can raise and lower the arm without any pull inward or outward. 

When using the above method on the Garrard / SME setup, I am only able to get the anti-skate adjusted to where I can raise and lower the stylus near the center or middle of the playing surface.  Perhaps the SME needs a tune up?

Norman

Had AR table 40 yrs ago it was good at that time.

And that is why designers use a spring or magnet for antiskate in many of the tonearms.  It is to vary the amount of the bias force as the arm gets closer to the spindle.

rotarius,

If you can flash back far enough, My Dual 1229's original tonearm used the spring method.  It was so easy to set up.  Unfortunately it was damaged decades ago in a move and so I replaced it with the Grace 747.

I wasn't aware until your post that the anti-skate (when using magnets or springs) varied in bias force throughout the record.  That to me would be the logical method to use in a tonearm.

Norman

Hi Norman,

Thanks for the additional info.

I've read on several occasions that although it is not uncommon for people to adjust anti-skating using a record having a blank side, that is not an optimal technique.

That is because a basic factor in the origin of skating force is friction between groove wall and stylus, and a blank record of course does not have any groove walls. Therefore the resulting contact and friction are very different than when the stylus is in the groove of a rotating record.

The procedure I've always found to work well, at least with cartridges having medium to high compliance (I have no experience with cartridges having low compliance), and which I’ve found to generally require little if any subsequent fine tuning by ear, is as follows:

1)Observe the cartridge from the front while it is in the groove of a low volume passage of a rotating record, and positioned somewhere in the middle of the record.

2)Adjust anti-skating until deflection of the cantilever to one side (left or right) becomes barely perceptible, relative to its position when the stylus is lifted off of the record. Note the setting.

3)Adjust anti-skating until deflection of the cantilever to the other side (left or right) becomes barely perceptible, relative to its position when the stylus is lifted off of the record. Note the setting.

4)Set anti-skating to the mid-point between those settings.

5)Verify that no perceptible left or right deflection of the cantilever occurs near the beginning and near the end of the record.

Regards,
-- Al

The skating force is a component of the friction force vector so it is dependent on the tracking force and the offset angle.  Friction in turn is also dependent on the groove surface, contact area of the stylus, etc.  Back in the day, some manufacturers would provide a chart of antiskate values based on the stylus profile. Most vintage tt antiskate dials were calibrated for conical stylii, you have to dial it down a bit for ellipticals.