To decrease the effective mass of the mobile assembly and
obtain sufficient output voltage to excite the pre-amp input of the equipment,
the ADC firm introduced in 1960, the system called induced magnet. With
the same principle of operation as the previous systems, this system has a
powerful magnet or several outside the mobile assembly. This system combines
the advantages of the two previous systems, since the very low effective mass
provides a very high output voltage. These systems are also called under the
generic names of variable reluctance, and of mobile iron. As the mass of the
very small moving set, the cartridge can work with low support forces, which
facilitates the movement of the needle in the furrows and promotes the
reproduction and preservation of the discs. Obviously not only that the
cartridge works with the smallest mass, but with the minimum, without detriment
of quality, avoiding the jumps of needle, especially in the ends of the disc.
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