(under subclass 87) Subject matter involving at least two stages of amplification wherein the output of each stage is coupled to the input of the preceding stage except the first, and wherein at least two of the stages are arranged as defined in subclass 87 with signal feedback from the cathode impedance of the latter of the cascaded stages to the cathode impedance of a preceding stage.
SEE OR SEARCH THIS CLASS, SUBCLASS:
92, for signal feedback to the cathode impedance of a prior stage combined with diverse type signal feedback.
98+, for signal feedback in cascaded amplifiers generally.
