(under subclass 75) Subject matter wherein the signal feedback path, from the output electrode of the amplifying device from which the signal feedback is derived to the input electrode of the amplifying device to which the signal feedback is applied, is a D.C.. conductive path.
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9, for amplifiers having periodic switching means for input-output comparison including those with D.C.. conductive feedback paths.
83, for push-pull amplifiers having D.C.. conductive signal feedback paths.
