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RE: Background...

Posted by tketcham (A) on May 26, 2012 at 06:37:39

In Reply to: RE: Background... posted by John Elison on May 25, 2012 at 21:26:32:

Hi, John,
I figured you'd seen those posts. I only included them because they mention the atypical alignment geometry of the 309, which sets the inner null point closer to the end of the record. I did finally come up with one of the posts (link below) that I was referring to previously. (I was surprised to see that the post was in response to one of your questions.) There was another post, perhaps on Vinyl Engine, with similar information on the 309 but I cannot get a search to find that one.

It appears you've recreated a close approximation of the original (?) geometry of the 309. I've done something similar using the Vinyl Engine calculator/graphing feature. I could get the inner null to be very close to 66.0mm but the outer null was about 116mm if using an offset angle and overhang close to what is specified. I could get a better Lofgren A 66mm/120.9mm fit if the offset angle was pushed to 23.8 degrees and a corresponding 17.8mm overhang.

I guesss the thing to keep in mind is that all of this is speculation on our part. Only SME knows exactly why there are conflicting specifications on their web page and in their SME 309 brochure (EL=232.32mm) and manual (EL=232.2mm). But at least the speculation is based on relatively good evidence. :-)

Regards,
Tom

• SME 309 alignment change post   (Open in New Window)

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