(under the class definition) Subject matter wherein the tuned circuit includes a reactance element or elements which are directly responsive to a change in voltage and/or current which is applied across or through the reactance element or elements, with the variation in the voltage and/or current causing the reactance value of the element or elements to vary or change and thereby tune or adjust the resonance of the tuned circuit.
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4, for tuners which are responsive to an external magnetic field, e.g., the magnetic field is that of a spatially movable permanent magnet.
5+, for tuners which are responsive to an external nonelectrical stimulus or condition.
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257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes), appropriate subclasses for active solid-state devices, per se.
307, Electrical Transmission or Interconnection Systems, 401+, for miscellaneous nonlinear reactor systems.
330, Amplifiers,
145, for amplifiers having variable impedance elements which are directly responsive to voltage or current variations.