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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
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Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages
Hot tubes in an audio power amplifier, emitting their distinctive red-orange glow
Hot tubes in an audio power amplifier, emitting their distinctive red-orange glow
Illustration representing a primitive triode vacuum tube and the polarities of the typical DC operating potentials. Not shown are the impedances (resi
Illustration representing a primitive triode vacuum tube and the polarities of the typical DC operating potentials. Not shown are the impedances (resistors or inductors) that would be included in series with the C and B voltage sources.
Radio station signal generator with vacuum tubes
Radio station signal generator with vacuum tubes