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RE: Technics arm mass and spec

Posted by John Elison (A) on March 1, 2017 at 02:25:10

In Reply to: Technics arm mass and spec posted by flood2 on March 1, 2017 at 00:19:08:

Hi Anthony,

> They quote 22g including cartridge mass of 6g. Headshell is 9.5g.

That's interesting and very commendable on Technics part. They also state the VTF of 1.75-grams. This represents a very precise way of presenting effective mass because effective mass actually varies slightly depending on the position of the tonearm counterweight. Therefore, knowing cartridge weight and VTF pins down the position of the counterweight precisely.

The effective mass of the tonearm without the 6-gram cartridge might be slightly greater than 16-grams since the center-of-mass of the cartridge is probably not concentrated at the stylus but is slightly behind the stylus. For example, suppose the center-of-mass of the cartridge were 7-mm behind the stylus. The cartridge's effective mass would be calculated as follows:

Cartridge Effective Mass = 6*223² / 230² = 5.64-grams

Now, if you removed the cartridge without changing the position of the counterweight, the tonearm effective mass would be 22 - 5.64 = 16.36-grams. However, we normally don't go into this kind of detail so we simply approximate tonearm effective mass as 22 - 6 = 16-grams.

With respect to tonearm geometry, the Technics SL-1301 reminds me of the geometry of the early SME III. Compare the two graphs below:

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