Old TVs, early supercomputers, and modern fancy sound equipment all use vacuum tubes. But why? What does a vacuum tube do?
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The mainstream application of vacuum tubes these days is the magnetron in your microwave oven, which is a special oscillator that can put out kilowatts of power at 2.4 GHz. CRT’s are also a kind of vacuum tube, but we have pretty much replaced those with LCD or LED technology.
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