A double diode triode is a type of electronic vacuum tube widely used in radio receivers. This article is about the electronic device not an evacuated pipe used for experiments in Free-fall. Radio is the transmission of signals by Modulation of electromagnetic waves with frequencies below those of visible Light. The tube has a triode for amplification, along with two diodes used as detectors, or Automatic gain control. A triode is an electronic amplification device having three active electrodes Automatic gain control (AGC is an adaptive System found in many electronic devices Some common types are the 55, 12SQ7, 12AV6.
References
RCA Receiving Tube Manual, Series RC-12, RC-19, RC 25 - Published by RCA.
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