Chapter 11

Moving-Coil Head Amplifiers

Moving-coil cartridges are generally accepted to have a better tracking performance than moving-magnet (MM) cartridges because the moving element is a set of lightweight coils rather than a magnet, which is inevitably made of a relatively dense alloy. Because the coils must be light, they consist of relatively few turns and the output voltage is very low, typically in the range 100–700 uV rms at a velocity of 5 cm/sec, compared with 5 mV rms from the average MM cartridge. Fortunately this low output comes from a very low impedance, which, by various technical means, allows an acceptable signal-to-noise performance to be obtained. Apart from the low output, a further complication is that the output voltage ...

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