Unipivot tone arms


Help me Understand how Unipivot tonearms function  what are the advantages and disadvantages?

lstringfellow

I had a cartridge trial back in the 1970s which definitely had a mismatch with the tonearm as it couldn’t track any warp.

Prior to using a gimbaled arm, my Brooks Berdan highly modified SME IV from 1989, I used unipivots. I still use an Ultracraft 400 unipivot arm on a VPI 19-4 with a Grado G+ 78 cartridge with no dampening (silicone in the base). It works great.

For my LPs, I use the SME above with a Dynavector 20X2 L (previously with a Benz Ruby 3). It is so great other than setting up it’s VTA (spring loaded and coarse adjustments).

My best friend has an upgraded VPI Scout with a unipivot VPI arm. We don’t notice any problem with the bass using a Dynavector 20X2 H. Tight and deep bass, tracks warps great.

This is a very interesting forum. If I were to purchase a "unipivot" arm in the future, I will ensure that it has some type of balancing/range mechanism rather than a totally free floating (like my Ultracraft) arm. The Tri-Planar arm was a second choice to the SME but more expensive at the time.

Unitrac parts.  Out of my own necessity for parts for this arm, I am making parts for this arm, specifically the anti-skate bucket and the headshells - likely more as demand follows.  If anyone needs these items please email me @ [email protected]

@secretguy  it was mentioned as imo it should be. Magical for the relatively low & but definitely quirky to extract what it is capable of. I’ve never owned one but have helped a few with setup, etc

@effischer lovely post. Tri is really a wonderful fellow - I have a 7 mk 2 upgraded near Ultimate level. Not an easy install on a SOTA ( I wouldn’t attempt it either ). My Triplaner moves easy between three tables due to surface mount.

The Basis Vector 4 is excellent also - RIP A J