VPI 2nd Pivot for 3D

Dear Stringreen,
I think what Raul may be referring to is the eccentricity as the uni transcends a warp. If you videoed it then played it back in slow motion you'd see the cart wobble from side to side. My guess is that the effect might be worse with line contact and low compliance but the fact is that folk have been using regular unis for years and are unconcerned by rumours of eccentric behaviour. It goes without saying that in the general sense increased noise (for example) during the warp is often expected.
 Gimballed arm users needn't feel too smug because warps seldom remain in the same lateral plane as the cartridge but there is no active compensation other than via the cart's suspension or the cantilever. ;)

If there is a contest between the SL1200G & the Prime, this modification ups the stakes.
Happy listening!

Until I found this thread I wasn't even aware of this mod.  Just ordered mine and will report back on my experiences with it.  I haven't really had too much trouble with the unipivot, but the comments I've found suggest that the other pivot is a bit of an improvement.  

I didn't care much about the wobbly unipivot. For me the improvement of the 2nd pivot is mostly sonic - in imaging and dynamics - and also the fact that you can easily adjust the azimuth without altering the VTF.  

On a note of clarification when I mentioned the effect might be worse for line contact I was of course referring to the listening experience not the "wobble" effect ;) :)

If it is wobbling then spherical or elliptical might notice it less ;)

Dear @stringreen : """ the stability problem is eliminated. """

well, that’s what we think but: is it true?

The cartridge stylus tip is below a " tremendous " task where are generated hard and huge forces when ridding the LP recorded grooves.
Those forces come generated with almost at random directions/vectors that are transmited by the cantilever to the cartridge suspension to the cartridge motor and to the cartridge body and from here to the headshell/arm wand and tonearm bearing.

Those movements/vibrations are not a tiny ones but huge ones to generates unstabilities at the tonearm bearing where a unipivot can’t handle with aplomb and where that kind of unstabilities genrates colorations/distortions to the audio signal. This happens in a way down way with fixed bearing tonearm designs.

Take a look to these links on what the at each single groove where stylus cartridge tip has to " figth " and where each single groove is and has different path.
Additional to all those all the LPs comes with micro and macroscopics warps and all LPs are not dead centered mading the whole unstability subject more critical:

http://www.synthgear.com/2014/audio-gear/record-grooves-electron-microscope

https://www.google.com.mx/search?q=lp+grooves&tbm=isch&imgil=ktDEnuPAQUb1yM%253A%253BeuEapQR8NyxSFM%253Bhttp%25253A%25252F%25252Fwww.openculture.com%25252F2015%25252F06%25252Fa-stop-motion-of-a-needle-riding-through-lp-record-grooves.html&source=iu&pf=m&fir=ktDEnuPAQUb1yM%253A%252CeuEapQR8NyxSFM%252C_&usg=__Z4r0L19_k_EmY-GbwrRGAmPGugA%3D&biw=1366&bih=676&ved=0ahUKEwiZyteszZ3VAhXBJCYKHUFNCRoQyjcIMQ&ei=z6RzWdmmOcHJmAHBmqXQAQ#imgrc=ktDEnuPAQUb1yM:

https://www.youtube.com/watch?v=GuCdsyCWmt8

As always I’m not talking here if we like what we are hearing through unipivots or dislike, this is not the issue but to stay nearer to the recording that means we need to stay with distortions ( of every kind. ) at minimum and unipivots can’t help to achieve that main target.

I owned and own unipivots but as I posted I just do not likes because all those.

Can I be wrong?, just tell me. As I said, cartridge needs must be fulfilled by the tonearm design characteristics where bearing and damping make a paramount differences on the quality level of system overall performance. For me unipivots are out of the " equation ".

Regards and enjoy the MUSIC NOT DISTORTIONS,

R.