The system patented by Ortofon in 1948 is synthesized in the
following way: A coil loop in two different positions, one at rest where the
magnetic field crosses the coil without inducing any current. When changing
position, carried by a movement that would transmit the needle through the
lever in the loop (coil) is induced a current that runs through a tension at
its ends.
In fact, in practice, to produce stereo capsules are used
two coils, one per channel. In the construction of the coil so that it does not
add mass, the coil must be of very few whorls and of a very fine wire that can
come to contribute a negligible weight less than 1 mg between the two coils.
In general this system gets a good response in frequency and
separation between channels, being its very low mobile mass. In general, they
are cartridges of good characteristics. The manufacturers that use this system
are: Ortofon, although in not all models, Dynavector, which has introduced very
refined techniques in the construction of cartridges.
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