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Around 1920, the
commercial broadcasts, using voice and music, began to become popular
but still, these radios could only be used with headphones, and many people
wanted to use speakers (horns or "drums"), so that the whole family could listen
at the same time. This required an AUDIO STAGE AMPLIFIER so that the speaker
could get enough power to fill a room with sound. By the late 1920's
more and more homes had electricity, so a way to power a radio by
plugging it into the wall socket was developed, using tubes that didn't
hum when powered with AC.
People still wanted more sensitivity, and as stations became more and more
crowded, more selectivity, so the modern SUPERHETERODYNE became more popular
(the first commercial example was the RCA AR-812 in 1923
In 1960, Sony introduced its first transistorized radio, small enough to fit in
a vest pocket, and able to be powered by a small battery. It was durable,
because there were no tubes to burn out. Over the next 20 years, transistors
replaced tubes almost completely
In the 1970s, LORAN became the premier
radio navigation system. In the early 1990s, amateur radio experimenters began
to use personal computers with audio cards to process radio signals.
Examples of collectible radios include :
bakelite, plastic, tube portables, wooden,
zenith transoceanic, transistors, high fidelity Radios and Memorabilia
Admiral, Globe, Coronado, Emerson, GE, Majestic, Philco, Philips,
Silvertone,
Westinghouse, Zenith, Airline, Cavalier, Coronado, Crosley, Emerson, FADA,
GE, Graymark, Hallicrafters, Clear , Mike-Radio, Motorola, RCA,
Satellite, Sparton, Star-Lite, Trav-ler, Westinghouse, Zenith, Zephyr,
Olympic, Packard Bell, Philips, Schaub-Lorenz, Sentinel , Bendix ,
Electrohome, Belle Spice, Chest , Midwest, Philco, Silvertone, Fisher,
McIntosh, Scott
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