Vinyl Asylum

Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

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RE: Torque on the cantilever?

Posted by flood2 on September 15, 2023 at 02:59:58:
"when you mount the coils directly above the stylus, this eliminates the possibility of the coils moving in a different direction from the stylus."

I agree with your statement but surely that is assuming that the coils are mounted on an infinitely stiff and mass-less plane that is moving perfectly normal to the record surface?

What we have is a flat support plate of a finite mass that is angled forward (with respect to the record plane) and swinging in a small arc defined by the VTA. The centre of mass is above and forward of the stylus which means that the mounting point to the cantilever provides a point of flexure and there would be specific vibration modes related to the mass and dimensions of the support plate and the position of the coils. We already know that vibrations are transmitted into the vinyl from the stylus vibration reaction force (which we hear as needle talk) and these vibrations must therefore also be transmitted up to and within the support plate which would affect the coil position within the magnetic field which would not necessarily be in phase with the stylus movement.

Perhaps they have calculated an optimum diameter of the coils to make the plate stiffness inconsequential with sufficient mass to damp any vibrations within the audible range.