Brf wrote:A cartridge that is offset from the main pivot will exhibit azimuth changes in the vertical plane (i.e. warped records) if there is not a corresponding offset in the tone arm’s bearing assembly – this fact is not in dispute and is based on the principles of geometry.
The image that you posted is that of an Origin Live tone arm in which the designer made a conscious and deliberate decision not to offset the bearings as a design compromise to favor frictional bearing tolerance over slight azimuth errors in the vertical plane.
If you google fixed bearing tone arms, it will yield many example of tone arms with offset main bearings i.e. SME, Rega, Jelco, Reed, Kuzma, SAT, etc.
In addition, I am not sure how torque is transferred to the cantilever with the addition of a second pivot, as free rotation is now restricted (constrained) along the longitudinal axis (azimuth) but retains free rotation in both the perpendicular and lateral axis.
In any event, I would urge you to try a dual pivot yourself.
[/quote]Golear wrote:Hi Votan
If you look at an SME tonearm, you'll see the vertical bearing mounted at an angle to the arm tube. Is this better/worse than what is done on the Conqueror arm? Given the degree of motion (very little) and the speed of motion (very slow), I can't imagine this making the slightest difference.
When it comes to the Dual Pivot, here's an idea on set-up:
1. Install the SoundSmith CounterIntuitive and Dual Pivot.
2. Set VTA then set VTF. Repeat as necessary.
3. Rotate the CounterIntuitive slightly in a clockwise direction, until the stylus wants to point away from the spindle.
4. Set the azimuth, using the Dual Pivot.
5. Align cartridge.
You're all set. You can vary the force on the Dual Pivot by rotating the CounterIntuitive. The VTF will not be affected if all you only rotate the CounterIntuitive. (The force on the Dual Pivot may act as an anti-skate.)
The question is if really the so called “Dual Pivot” is in fact a second pivot point, which together with the main central pivot could form a (more stable) axis for the movements of tonearm-cartridge in wrapped LPs (regardless of whether this axis is in a vertical plane to the arm’s axis or to the offset one’s), or it’s just a stabilizer that may create the mentioned torque to the cantilever.
Because the more pivot it (the Dual Pivot) wants to be, the more pressure in the sliding pant it demands, hence more troubles creates (in the already existing) to anti-skating.
But also and mainly, because as Mat Weisfeld stated in the “New Cuing Device and Dual Pivot Point” topic in Oct 11, 2017 8:02 am:
“After getting a great suggestion from a different form, I'm considering changing the name of the "Dual Pivot" to a "Stabilizer adapter”. Realistically that is exactly what it does, so it might be a more proper name/representative of what it is.”