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In Reply to: RE: Getting accurate stylus force gauge readings posted by Peter C on March 15, 2017 at 12:10:24
I gather the basis for your idea is that the gauge readout goes unstable when the cartridge even approaches the weigh pan, without even touching it. Is that so? That's interesting. I will have to check it out with mine. I've owned mine for several years now. Since I have all too many cartridges and turntables, I use it quite a bit. It's always rock steady in read-out and never reads anything but zero when tared with no weight on the pan. My scale is identical to the one shown by Fremer in the URL I posted above (but I did not pay $80 for it).
If your weigh pan is magnetic or if something under the weigh pan is magnetic, I could imagine that the readout would go unstable even with the cartridge hovering over it but not touching it, because in that case the magnetic attraction would be pulling upward on the weigh pan, which would no doubt perturb the readout.
I have the same metal bodied (I assume it is metal) as you do and have the same issue with my Ortofon Jubilee. The weight goes nuts while lowering the cart down to the measurement point. I constructed a similar gizmo as JE and the 5 gm weight reads the same whether on the platform or cantilevered off on the gizmo. Interestingly, once the cartridge is on the platform or the gizmo, the final weight is close to the same. I just do both measurements and compare. Then I don't worry much because they are very close and I have bigger things to worry about these days.
I have an Ortofon MC2000, the vintage MC with vanishingly low output. I was lowering it down on the platter of one of my DD turntables when it suddenly got sucked down flat onto the platter mat. Fortunately, the suspension took the hit and seems to be OK. I was using an LP-sized piece of TI Shield under the platter mat, to block EMI from the motor from causing issues with induced noise. Turns out TI Shield is partly ferrous and its ferrous layer was being magnetized by the underlying rotor of the DD motor. That was too close to the magnets of the Ortofon, and the two tried to kiss each other. This had never happened before with any other (non-Ortofon) cartridge. Later on, an Ortofon guru told me that they tend to place the magnet near the bottom of the cartridge body which makes it susceptible to this sort of accident. Maybe your problem with your Orto is of a similar nature. When I removed the TI Shield, the problem went away entirely.
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