This thread, like so many, has gotten off course. I have owned both the Triplanar and the Schroeder arms. The Triplanar was an early version and the Schroeder was a special version for the Loricraft/Garrard 501 turntable.
I think, however, that the characteristics of the arms endure.
The Triplanar was easy to set up and to adjust VTA. It is very smooth but not as dynamic as the Schroeder. The Schroeder is designed for rigidity and is somewhat difficult to set up. The key variable is the gap between the magnets. VTA is difficult to change reliably.
I don't remember which cartridges I used with the Triplanar. On the Schroeder I used the Allearts MC2 and the Decca Jubilee. Although it was very difficult to optimize the Decca, when I did, I loved the sound.
I now have the Shindo Labs/Garrard 301 which uses what was originally the 12" Ortofon spring loading arm and the Ortofon SPU cartridge. This is all designed to work together and is easy to set up, but VTA is not easily adjusted. As a system, it is the best vinyl I have owned.
I think, however, that the characteristics of the arms endure.
The Triplanar was easy to set up and to adjust VTA. It is very smooth but not as dynamic as the Schroeder. The Schroeder is designed for rigidity and is somewhat difficult to set up. The key variable is the gap between the magnets. VTA is difficult to change reliably.
I don't remember which cartridges I used with the Triplanar. On the Schroeder I used the Allearts MC2 and the Decca Jubilee. Although it was very difficult to optimize the Decca, when I did, I loved the sound.
I now have the Shindo Labs/Garrard 301 which uses what was originally the 12" Ortofon spring loading arm and the Ortofon SPU cartridge. This is all designed to work together and is easy to set up, but VTA is not easily adjusted. As a system, it is the best vinyl I have owned.

