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RE: Technics SL-1200 Alignment

Hi Frank,

I don't mind the intrusion at all. I would just like to get the bottom of this.

Normally SME provides more parameters than effective length. Nowadays, SME provides pivot-to-spindle and offset angle in addition to effective length. These three parameters define the tonearm geometry completely. In fact, any three independent parameters defines a unique tonearm geometry for which all other parameters can be determined. I truly believe that "Distance from Bedplate Center to Turntable Center" is pivot-to-spindle distance for the specified effective length. Therefore, here are the numbers directly from the manual of the Early SME Series III:

Effective Length = 229-mm
Pivot-to-Spindle = 215.4-mm


.

I owned the "later" version of the SME III, which was designed for Lofgren A geometry within the IEC modulated groove envelope. It had alignment null-points of 66.00-mm and 120.89-mm.


.

I'll take your word for the older Series II tonearm having an outer null-point of 117.42-mm since you measured it. However, if I find any SME published information I'll keep you posted.

Thanks,
John Elison

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