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Video Transcript - Rose
Video Transcript - Rose

... For example, the reciprocal of -j 30 mS is +j 33.3 Ω. You might also note that since the impedance is positive, the original element was apparently an inductor. All the other inductors have a similar calculation. The reciprocal of j 70 mS is –j 14.3 Ω. Those two elements are capacitors. If it’s pure ...
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Valve RF amplifier



A valve RF amplifier (UK and Aus.) or tube amplifier (U.S.), is a device for electrically amplifying the power of an electrical radio frequency signal.Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of transmitters, transmitter output stages switching to transistors somewhat later. Specially constructed valves are still in use for very high power transmitters, although rarely in new designs.
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