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RE: it is a Stevenson if...

I think you are wrong about Stevenson's alignment. Without specifying innermost and outermost modulated groove radii, can you describe in words what Stevenson's alignment means? Here is my description:

Just like Lofgren A, Stevenson's alignment minimizes the weighted tracking error curve within the modulated groove envelope but with the caveat that the inner null-point be coincident with the innermost modulated groove. With Stevenson's alignment, there are only two maximums on the weighted tracking error curve---one at the outermost modulated groove and the other in-between the null-points. The outer null-point is placed so that these two maximums are equal and minimized.

With regard to SME 309 geometry, I believe it uses Lofgren's "A" alignment with an innermost modulated groove radius of 58-mm and an outermost modulated groove radius of 146-mm. This is only my observation because I have not discussed this with anyone from SME. The only thing I know for certain is that the SME 309's null-points are 63.575-mm and 119.496-mm. These are calculated from the SME 309 dimensions published on SME's website.



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Here is a graph of the SME 309 alignment using the dimensions on the SME website. Note the null-points in the purple cells:


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Here is another graph with innermost and outermost groove radii held to exactly 58.000 and 146.000:





Edits: 02/15/17
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