Tetrode
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A tetrode is a vacuum tube having four active electrodes. The four electrodes in order from the centre are: a thermionic cathode, first and second grids, and a plate. There are several varieties of te
4-1000A 1 KW radial beam power tetrode in an amateur radio transmitter
Tetrode of the Bi-Grid Valve type
Circuit using bi-grid tetrode oscillator as AM transmitter. H is a source of high voltage.
View of the interior of an Osram S23 screen grid valve. In this valve the anode is in the form of two flat plates. The wires of the screen grid can also be seen. The anode connection is at the top of the envelope to minimise anode-grid capacitance
Control grid
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The control grid is an electrode used in amplifying thermionic valves such as the triode, tetrode and pentode, used to control the flow of electrons from the cathode to the anode electrode. The contro
Illustration representing various control grid configurations