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Schottky, c. 1920
Schottky, c. 1920
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4-1000A 1 KW radial beam power tetrode in an amateur radio transmitter
4-1000A 1 KW radial beam power tetrode in an amateur radio transmitter
Tetrode of the Bi-Grid Valve type
Tetrode of the Bi-Grid Valve type
Circuit using bi-grid tetrode oscillator as AM transmitter. H is a source of high voltage.
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 al
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