Every pick-up mechanism – whether moving-magnet, moving-iron [HFN Nov ’21, HFN Jan ’23], strain gauge [HFN May ’21], ‘optical’ [HFN Jan ’19, HFN Feb ’21, HFN Dec ’22] or moving-coil – has its ‘sweet spot’ among all the individual design compromises. MC pick-ups employ very powerful fixed magnets that develop a focused magnetic field within which the coils move, attached to the rear end of the cantilever. The more turns in each coil, the higher the achievable output, but this adds to the overall moving-mass, the coil impedance and self-inductance which, variously, compromise the achievable high frequency response, tracking, phase linearity and transient performance. Reduce the number of coils, and the moving mass, impedance and inductance are all reduced to good effect, unless the output is now so low that…
