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In Reply to: RE: The most interesting thing I saw at RMAF... posted by gotoma8 on October 21, 2012 at 08:24:25
Yes, the arm base has a few articulating pieces and the pivot moves forward as it advances toward the end of the record. The trick is that it does this in a way that keeps the bearings in line with tracking friction and doesn't introduce skating forces.
Follow Ups:
Now, that's pretty cool! Love to hear one! How long is the arm?
Wonder how it compares to say other linear tracking arms....
T
The arm has an effective length of 250-mm. If it works as advertised, it should perform better than air-bearing linear trackers because it will have essentially the same effective mass in the lateral and vertical planes just like ordinary pivotal tonearms. That is a big plus in my opinion.
Best regards,
John Elison
The effective mass in the horizontal plane is somewhat higher than the vertical due to moving the various bits of the linkage. IMO this is a benefit, it's the same principle as the Dynavector DV50X series of arms.
Mark Kelly
You seem to want to argue with me today. There is very little difference in the vertical and lateral effective mass for ordinary pivotal tonearms. Frank's arm is similar to ordinary pivotal tonearms in this regard. The Dynavector arm is not and it is my opinion that large lateral moving mass is not beneficial, especially when tracking records with elliptical grooves and off-center spindle holes, which comprise most records. I guess we will have to disagree. I don't like the Dynavector tonearm at all.
Best regards,
John Elison
You are glossing over the details. Frank's arm is anything but "similar to an ordinary pivoted arm". For the arm to work, when it pivots horizontally it must move the various parts of the linkage. This must add to the horizontal effective mass.
As I said, I see this as a benefit.
Mark Kelly
Well, I think you're wrong.
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