(under the class definition) Subject matter wherein the source of electrical energy which is controlled by the electrical signal is an A.C. electrical source, which is applied as an A.C. power supply directly to an electrode without any intervening rectifiers to rectify the A.C. electrical supply.
(1) Note. Special types of amplifiers are classified above and subject matter involving unrectified A.C. as a power
supply would be classified with the special type of amplifier and not herein. The amplifiers having general vacuum tube amplifying devices with this feature are classified herein.
SEE OR SEARCH THIS CLASS, SUBCLASS:
70+, for vacuum tube amplifying devices series energized.
113, for amplifiers having a polyphase power supply.
199, for amplifiers involving power or bias voltage supply means, generally. See also search notes thereunder. 296, and 297, for semiconductor amplifiers involving bias or power supply circuits.
SEE OR SEARCH CLASS
363, Electric Power Conversion Systems, appropriate subclasses thereunder, for power supply means combined with means to convert A.C. to D.C.. or vice versa.
