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2. Transistor radio - Wikipedia

   en.wikipedia.org/wiki/Transistor_radio

   A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.

3. Regency TR-1 - Wikipedia

   en.wikipedia.org/wiki/Regency_TR-1

   A 22.5 volt battery provides power, since the only way to get adequate radio frequency performance out of early transistors was to run them close to their collector-to-emitter breakdown voltage. The current drain from this battery is only 4 mA, [ 7 ] allowing 20 to 30 hours of operation, in comparison to only several hours for the portable ...

4. Batteryless radio - Wikipedia

   en.wikipedia.org/wiki/Batteryless_radio

   A carrier-powered radio is a batteryless radio which "leeches" its power from the incoming electromagnetic wave. A simple circuit (very similar to a crystal set) rectifies the incoming signal and this DC current is then used to power a small transistor amplifier.

5. Ferguson Electronics - Wikipedia

   en.wikipedia.org/wiki/Ferguson_Electronics

   Small, battery-operated portable transistor radios to solid oak 6 ft wide hydraulic lid radiograms sporting fully automatic stackable Garrard turntables, multi-channel radios and 2-foot-wide stereo speakers were commonplace in many UK households. Open reel tape recorders and hi-fis followed.

6. History of radio - Wikipedia

   en.wikipedia.org/wiki/History_of_radio

   In 1954, the Regency company introduced a pocket transistor radio, the TR-1, powered by a "standard 22.5 V Battery." In 1955, the newly formed Sony company introduced its first transistorized radio, the TR-55. [65] It was small enough to fit in a vest pocket, powered by a small battery. It was durable, because it had no vacuum tubes to burn out.

7. TR-55 - Wikipedia

   en.wikipedia.org/wiki/TR-55

   The speaker grille was made from punched aluminum, and its design was reportedly inspired by Lincoln Motor Company automobiles of the era. Although it was not as compact as originally intended, the relatively small size of the TR-55 was a novelty, and attracted the attention of Japanese consumers.