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The simplest answer to that question is: Vacuum tubes were originally used to

perform every function now handled by transistors.

The transistor was a big improvement over the vacuum tube because in order

to perform those functions, a vacuum tube needs two power supplies, including

one at a comparitively high voltage, it occupies a comparitively ridiculous amount

of space, and radiates a comparitively ridiculous amount of heat.

When vacuum tubes were still the only way to go, there were no portable radios

smaller than a Chicago phone-book, and most of their weight was made up of

several heavy batteries.

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13y ago

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