Fidelity Research FR14 as good Sonically as FR64 or Jelco750?

Probably not.

Dear @vinny55: "  Is FR14 a really good sounding arm? " , well that's is not easy to say because a tonearm is not a transducer as a cartridge.

Its quality level performance depends  mainly on a well matched cartridge couple.

By its design characteristics looks fine and with advantages against the 64 because the F14 is static balanced design and does not need the ringing VTF mechanism that comes in the 64. 

The offset between the arm wand and the pivot/counterweigth is something " weird " in the 14 design and difficult to say if it's an advantage or disadvantage during play tests.

The 14 bearing friction is very low and this could has a meaning of its quality level and design excecution.

Even that this link comes from 2008 maybe you can contact this F14 owner whom could gives you first hand information:

https://www.vinylengine.com/turntable_forum/gallery/image_page.php?album_id=30&image_id=5731


Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

@rauliruegas Thanks for that information. I know a private guy who has one for sale for 550 or would do a partial trade for nagaoka mp50plus  debating if should pay straight cash or do the trade