"From that night on, the electron-up to that time largely the plaything of the scientist-had clearly entered the field as a potent agent in the supplying of man's commercial and industrial needs... The electronic amplifier tube now underlies the whole art of communications, and this in turn is at least in part what has made possible its application to a dozen other arts. It was a great day for both science and industry when they became wedded through the development of the electronic amplifier tube."

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People spend thousands of dollars on stereos. Sometimes tens of thousands. There is a specialist industry right here in the States which builds stereo gear to a standard you wouldn't believe. Tubed amplifiers which cost more than a house. Speakers taller than me. Cables thicker than a garden hose. Some army guys had that stuff. I'd heard it on bases around the world. Wonderful. But they were wasting their money. Because the best stereo in the world is free. Inside your head. It sounds as good as you want it to. As loud as you want it to be.

— Lee Child