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A double diode triode is a type of electronic vacuum tube widely used in radio receivers. The tube has a triode for amplification, along with two diodes used as detectors, or Automatic gain control. In electronics, a vacuum tube (U.S. and Canadian English) or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. ... Simplified diagram of a triode. ... Automatic gain control (AGC) is an electronic system found in many types of devices. ...

Some common types are the 55, 12SQ7, 12AV6