Dynatron oscillator
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In electronics, the dynatron oscillator, invented in 1918 by Albert Hull at General Electric, is an obsolete vacuum tube electronic oscillator circuit which uses a negative resistance characteristic i
Dynatron vacuum tube signal generator, 1931. It covered the range 1.8 to 15 MHz. The circuit was used in signal generators due to its frequency stability, which was compared to crystal oscillators
The dynatron oscillator circuit was also used as the local oscillator in early vacuum tube superheterodyne radio receivers, such as this 1931 Crosley model 122 seven tube radio.
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