Quote:
Originally Posted by mreid
TWTs, klystrons, and magnetrons are not vacuum tubes. They are high frequency oscillators used to produce radio waves and radar transmissions.
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They are all thermionic devices operating in vacuum. Thus, they could be loosely called "valves" or "tubes". While a magnetron is oscillator , TWT's and klystrons are amplifiers Maybe you got it mixed up with reflex klystrons, which were used as oscillators long time ago.