(under subclass 53) Subject matter including at least one push-pull stage of amplification.
(1) Note. A push-pull stage of amplification for this class requires a balanced input to two tubes and a balanced output therefrom; for further details of the definition of a push-pull stage of amplification see the class definitions of this class, section I.
SEE OR SEARCH THIS CLASS, SUBCLASS:
118+, for push-pull amplifiers generally. See the notes and search notes thereunder.
