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Therefore if the linear offset was not chosen to be 93.47mm (as for SME V or IV), you will not get the Baerwald nulls for an IEC LP. However, you can only adjust to match the "design" values for the null points. The SME arms are designed for a pre-determined linear offset based on whatever modulation envelope they decided on.which defines the null points - by fixing the headshell offset angle and adjusting the base, you can align any cartridge irrespective of the stylus tip/mounting hole distance (within reason).
SME TONEARM ALIGNMENT PROTRACTOR SERIES
RE: SME 3009 series II protractor, posted on Jat 01:14:20 Of course my personal collection of records will include discs cut with max/min radii that do not conform to these averages hence my scepticism about the need for absolute accuracy in this matter ( so long as the stylus is held at the correct distance from the pivot).Īm I right to be so inclined? I would appreciate your thoughts John as you really are the expert on such matters. Most recently ( as far as I am aware) by Keith Howard in 2010. Others have calculated averages more recently as disc cutting has changed over the years moving the max/min radii.
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In the case of Baerwald that was in the late 1930s using 78 discs. In other words the base figure comes from an average of measurements taken across a number of discs at some point in time. The distances calculated are based upon the maximum and minimum radii of the modulated area of typical discs. However what these distances may vary from calculation type to type e.g. These are selected to ensure that the null points are placed at reasonable points within the modulated area of a typical disc bearing in mind the tangential movement of the disc cutter. " the correct distance from the spindle hole"Īlthough I can understand that the alignment point needs to be placed along an arc that relates to the correct effective length of the arm, I do have a certain amount of scepticism about the placing of the null points in relation to the spindle. Isn't the tracking adjustment in pivot?, posted on Jat 06:11:38 Perhaps user's expectations were less precise in those days? Actually it may only have had one alignment point but memory is unreliable.
SME TONEARM ALIGNMENT PROTRACTOR PLUS
If I cast my mind back to when I bought an SME 3009/II ( 1970 so my memory may be dim) it came with a simple card protractor with a hole that fitted over the spindle and null alignment points plus parallel lines to ensure cartridge/cantilever positioning. This is all well explained on the Mint protractor website (linked) So although the protractor also shows conventional alignment grids it is arguable if the alignment points are correct as they are placed along an arc which only serendipity will make correct for any given cartridge in an SME arm. If you want to use an arc protractor with an SME this has to be custom calculated for your particular cartridge.
![sme tonearm alignment protractor sme tonearm alignment protractor](https://i.ebayimg.com/images/g/xWgAAOSwleBftrNf/s-l400.jpg)
Hence there can be no universally applicable tracking arc for an SME as the precise stylus position will vary cartridge model to model. With an SME you cannot change the distance ( unless you replace the headshell - but that's another subject). In conventional arms with headshell slots you can change this distance within reason so it doesn't need to be known at the outset. With an SME type arrangement in order to calculate the correct arc you need first to know the distance of the stylus in relation to the arm pivot ( effective length). I have my doubts about this as it incorporates an arc protractor which cannot necessarily be used with SME arms whereby overhang is set by moving the arm pivot in relation to the spindle via the base and not by moving the stylus in relation to the arm pivot. RE: SME 3009 series II protractor, posted on Jat 04:38:42 RE: Isn't the tracking adjustment in pivot? - PAR 06:38:30 06/26/18īTW. Isn't the tracking adjustment in pivot? - FenderLover 06:11:38 06/26/18