Some aircraft systems still use electron tubes in their equipment.

And a large of old model aircrafts that are still in service use vacuum electron tubes in their application.

Originally electron tubes were developped to be used for radio application.

They were used in radio transmitters as oscillators for generating audio as amplifiers for controlling voltage and current, also as radio frequency signals,  and as rectifiers for converting alternating current into direct current.

For avionics application  mainly 4 kind of electron were used: Triodes – diodes – Tetrodes and Pentodes.

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