The effective mass of the Jelco 750D 9″ tonearm with the standard headshell but without cartridge is 13.48g.
Here is correspondence from Jelco, Haruo Uchida/Sales Manager
SA-750D effective mass is 13.48gr without cartridge( effective mass is 19.23gr with 6.5gr cartridge). We think that the higher compliance cartridge is usable to SA-750.
The standard HS-25 headshell weight is 12g. The economy HS-50 headshell weight is 9g. So it is possible to further reduce the effective mass by using the HS-50 headshell.
Posted in: Jelco Tonearms and Accessories