(under subclass 157) Subject matter wherein the converter includes an electronic tube.
(1) Note. See the class definition, Glossary, for a definition of an electronic tube.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11, for combined phase and frequency conversion by electron tube converter.
38, for systems wherein an A.C. of a first frequency is rectified and the resulting D.C. is inverted into an A.C. of a second frequency by electron tube rectifying and inverting means.
111+, for current conversion systems having an electronic tube type converter.
151, for phase conversion systems where the converter includes an electronic tube.
SEE OR SEARCH CLASS 84, Music,
674+, for electronic tube musical tone generators which may include frequency converters as subcombinations thereof.
327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,
113+, for miscellaneous repetition rate or frequency control or conversion.
329, Demodulators, particularly
368, and 370 for an electron discharge demodulator device in an amplitude demodulator.
331, Oscillators,
53, for cascaded oscillator systems of the frequency multiplying type, and subclasses 76 and 77 for oscillators combined with output coupling networks of the harmonic producing or selecting type. See the class definition of this class, Lines With Other Classes and Within This Class, for the line between Class 363 and Class 331, subclasses 53, 76, 77, and Class 328.
