Chapter 9

Moving-Magnet Inputs

Noise and Distortion

Noise in MM RIAA Amplifiers

The subject of noise in moving-magnet (MM) RIAA preamplifiers is an involved business. An MM cartridge is a combination of resistance and a significant amount of inductance, with neither parameter having standard values, and this is combined with the complications of RIAA equalisation.[1] Burkhard Vogel has written a monumental 740-page book solely on RIAA amp noise,[2] but even this does not exhaust the subject; I will do the best I can in a chapter. The basic noise mechanisms are described in Chapter 1.

The first priority is to find out the physical limits that set how low the noise can be, with the electronics considered alone, i.e. with no groove noise. The best ...

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