High power RF amplifiers for UHF and higher frequencies for example still use vacuum tubes, be they specialised planar tubes or slightly more exotic fare such as klystrons. Similarly there are ...

After a brief review of the history of the K2-W vacuum-tube op amp, an LTspice model is used to create its schematic in ...

Vacuum tubes fueled a technological revolution. They made the amplification of signals a reality for transatlantic telephone cables (and transcontinental ones too), they performed logic for early ...

A brief overview of the history and operating principles of vacuum tubes is discussed ... 1 The Audion was presented as a RF detector having increased sensitivity over the Fleming valve, as ...

The traditional method of obtaining high-power AM signals (employed by vacuum tube amplifiers) uses a transformer coupled AF PA (usually, Class B operated) to change the supply collector voltage of an ...