There are so few because there are no benefits! Read your question again:
That is the question: IF! IF it is such a good thing then yes. But is it? Since when? It looks good on paper. That's it!
On paper a pivoted arm is never tracking except at two infinitesimally small points as it moves across the record. If tracking error was such a big deal then everyone would hear it, right? Right? So then there would be comments all over the place from people, "I hate records because the distortion is so high at the beginning, and in the middle, and at the end, and it only sounds good for like a fraction of a second."
So I ask you, where are all those comments? Where are there ANY comments from ANYONE saying ANYTHING about how this bothers them? Not the geometric theory part. The actual hearing part. I'll tell you: NOWHERE! Tangential arms are a solution looking for a problem that does not exist. Except maybe in the minds of people who bought into tangential tracking arms.
But if is such a good thing
That is the question: IF! IF it is such a good thing then yes. But is it? Since when? It looks good on paper. That's it!
On paper a pivoted arm is never tracking except at two infinitesimally small points as it moves across the record. If tracking error was such a big deal then everyone would hear it, right? Right? So then there would be comments all over the place from people, "I hate records because the distortion is so high at the beginning, and in the middle, and at the end, and it only sounds good for like a fraction of a second."
So I ask you, where are all those comments? Where are there ANY comments from ANYONE saying ANYTHING about how this bothers them? Not the geometric theory part. The actual hearing part. I'll tell you: NOWHERE! Tangential arms are a solution looking for a problem that does not exist. Except maybe in the minds of people who bought into tangential tracking arms.