SL-1200G/Hana ML Best Headshell

No, the Technics SL1200 tonearm has an effective mass of 12g

The OEM headshell is 7.6g. 

From the HiFi News test report-

OK, I thought we were talking about the SL 1200G. I bought my 1200G shortly
after they came out. I did the research and the consensus was that the tonearm
mass was 12g. I found this information from several sources. I don't have the
time now to do the research again.

Also, the article above refers to the 1200GR. My understanding is that the 
GR has an aluminum tonearm versus magnesium for the 1200G.

Think of it this way: square root of 9 is 3. Square root of 12 is ~3.4. So the difference between 9g and 12g is not going to affect the calculation of Fr by much.

Should have noted that when you multiply effective mass times compliance and take the square root, keeping compliance constant, then the ratio of the result with a 9g vs 12g effective mass is even less different than the square roots of the two numbers 12 and 9 would suggest.

As regards the SL1200G or GR tonearm(s), if the headshell weighs 7.6g, which is light as headshells go, then the total effective mass of the tonearm in question would very likely be greater than 9g, it seems to me. More like 12g.