Chapter 5

Moving-Magnet Inputs

Phono Amp Architecture

Moving-magnet (MM) Phono Amplifiers

The previous chapter treated the phono amplifier as a black box, possibly with variable gain, while examining how it can be integrated into a preamplifier. This chapter dives inside the black box to look at the various ways in which a phono amplifier can be implemented, taking the desirability of variable gain as axiomatic.

It is explained in Chapter 12 that a highpass filter operating below 20 Hz is highly desirable to remove subsonic disturbances produced by the vinyl surface, and this is considered an integral part of the phono amplifier. There are thus a minimum of three stages to couple together; an input stage giving RIAA equalisation with a gain ...

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