Tubes to Transistors
Transistors were invented in 1947, but it wasn’t until 1955 that the first all transistor car radio was produced. Before transistors were invented, radios used vacuum tubes. Transistors were lighter and smaller, allowing radios to become more portable. This didn’t matter so much for car radios, but added benefits of transistors included them being less fragile, and being more efficient so they required less power to use that a vacuum tube radio.
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