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1935 – Heil oscillator
1939 – klystron amplifier
1944 – Helix type TWT
In the early 1950s – low power output of linear beam tubes to high power levels
Finally invention of Magnetrons
Several devices were developed – two significant devices among them are
1) extended interaction klystron
2) Twystron hybrid amplifier
CYLINDRICAL
LINEAR
COAXIAL
VOLTAGE-TUNABLE
INVERTED COAXIAL
FREQUENCY-AGILE COAXIAL
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