(under the class definition) Subject matter wherein the amplifying device is of the vacuum tube type and includes within the vacuum tube an electrode or other element having distributed parameter impedance characteristics.
(1) Note. Distributed parameter characteristics as used in the definition above include long lines and long line elements such as lecher lines, parallel transmission lines in general, concentric lines, wave guides, cavity resonators, tuned transmission lines, etc.., which possess distributed capacitance and inductance. For the definition of such means, see the class definition for Class 333, Wave Transmission Lines and Networks. Inherent capacity or inductance as for example between electrodes or of a lead inside the tube when made use of as a lumped reactance circuit element is classified in the appropriate subclass involving the circuit; neutralization by feedback is classified in subclasses 76+ below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4, for amplifiers having a maser type amplifying device which may include distributed parameter impedance structure.
5, for amplifiers having a solid element wave propagating amplifier device.
43, for amplifiers including traveling wave tubes.
45, for amplifiers of the type having an electron beam tube amplifying device with an electrode coupled to a cavity resonator. 53+, for amplifiers with distributed parameter type coupling. See the search notes thereunder.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices: Systems,
39+, for a vacuum tube combined with distributed parameter type transmission means structure, with the tube as the load device. See the notes and search notes thereunder.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
593, for miscellaneous circuits with distributed parameters.
359, Optics: Systems (Including Communication) and Elements,
