Nonode
Encyclopedia
A nonode is an electronic device having nine active electrode
s. The term most commonly applies to a seven-grid vacuum tube
, also sometimes called an enneode. An example was the EQ80, which was used as an FM
Quadrature Detector.
There was also an interesting concept implemented with nonodes. The idea was that every valve in the set was the same type, and connecting up its electrodes differently enabled it to do the full range of jobs required in a radio. The point was to solve the spares & serviceability problem, with nonode equipment far less quantity of spares could be far more useful. AFAIK these never saw widespread use though.
Electrode
An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit...
s. The term most commonly applies to a seven-grid vacuum tube
Vacuum tube
In electronics, a vacuum tube, electron tube , or thermionic valve , reduced to simply "tube" or "valve" in everyday parlance, is a device that relies on the flow of electric current through a vacuum...
, also sometimes called an enneode. An example was the EQ80, which was used as an FM
Frequency modulation
In telecommunications and signal processing, frequency modulation conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant...
Quadrature Detector.
There was also an interesting concept implemented with nonodes. The idea was that every valve in the set was the same type, and connecting up its electrodes differently enabled it to do the full range of jobs required in a radio. The point was to solve the spares & serviceability problem, with nonode equipment far less quantity of spares could be far more useful. AFAIK these never saw widespread use though.