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effective mass of Jelco tonearms

Can anyone help with the effective mass of Jelco tonearms with detachable headshells [I believe SA 250 or 750}?I've found conflicting values, including 18.5 gms, and other values. Is this without or with headshells, and if with headshells, what is the weight of the headsshell?
boofer
pbnaudio's avatar
pbnaudio
1,613 posts
 
The head shell on a SA750D with a ZYX R100 cartridge mounted with 2 screws weighs in at 17.97 gm.

The R100 is listed on ZYX site as weighing 5 gm, leaving a net of 12.97 gm for the head shell including the mounting screws.

Best of Luck

Peter
fleib
1,124 posts
 
The SA-750 is said to have an eff mass of 20g. It's considered a good match with the DL103(d) or other low compliance carts.

I don't have one of these arms. The info was reported in VE a number of years ago by the UK importer. Because the 750 has fluid damping of the pivots, it's said to be compatible with a wide range of medium compliance carts. The S shaped 250 has no fluid damping, but looks similar in construction and the geometry is the same.
Regards,
noromance's avatar
noromance
9,705 posts
 
Save for the 750... it is much better than the 250.
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