Amplifiers

SECTION I - CLASS DEFINITION

(A) This is the generic class for amplifiers as limited by the definition of amplifiers as it appears in the Glossary below.

(B) Included are amplifiers having all types of active elements (or amplifying devices, the term used in this class) as for example vacuum tubes, gas tubes, semiconductors, magnetic type saturable reactors, masers, etc.., as set forth in the specific subclasses in the schedule for the class. Specific types of vacuum tube amplifier devices included are, traveling wave type tubes, secondary emission type tubes, electron beam tubes, magnetrons, etc.

(C) Included are amplifier systems having plural amplifier channels, cascade amplifiers, push-pull amplifiers and other amplifiers having plural amplifier devices. Also included are amplifiers with plural signal sources or plural loads, as for example sum or difference amplifiers which have plural sources.

(D) Amplifiers including the means coupling the signal source to the amplifier or coupling the amplifier to the load or between cascaded stages are also included herein. Such coupling means include those of the distributed parameter type, resonant tuned circuits, filters, coupling designed to pass a broad band, D.C. coupled circuits, potentiometer means for volume control, equalizers, circuits for volume control, etc.