US PATENT SUBCLASS 330 / 42
WITH SECONDARY ELECTRON EMISSION TUBE AMPLIFYING DEVICE

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

42WITH SECONDARY ELECTRON EMISSION TUBE AMPLIFYING DEVICE

DEFINITION

Classification: 330/42

(under the class definition) Subject matter wherein the amplifying device is a vacuum tube including a secondary electron emissive electrode.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices,

103+, 377, 379, 399+, and 532+ for vacuum tubes, per se, having secondary emissive electrode.

315, Electric Lamp and Discharge Devices, Systems

5.11+, 11, 12.1, 39.63 for circuits including vacuum tubes as load devices having a secondary emissive electrode.