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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. 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.

4. 12 Electronics From the 1960s That Were the Ultimate Flex - AOL

   www.aol.com/12-electronics-1960s-were-ultimate...

   Known as the OG pocket radio, the Sony TR-63 was a tech marvel at the time and a must-have gadget for the hipsters of the ‘60s. Its compact design and portability made it a status symbol in ...

5. Regency TR-1 - Wikipedia

   en.wikipedia.org/wiki/Regency_TR-1

   Regency TR-1 transistor radio. The Regency TR-1 was the first commercially manufactured transistor radio, introduced in 1954.Despite mediocre performance, about 150,000 units were sold, due to the novelty of its small size and portability.

6. Pocket FM - Wikipedia

   en.wikipedia.org/wiki/Pocket_FM

   Pocket FM transmitter. Pocket FM is a small, low-powered radio transmitter designed for use in areas with tightly controlled or undeveloped communications infrastructure. The devices are portable and have the appearance of a receiver rather than a transmitter, making them more practical for citizen use and harder for authorities to detect when used subversively in pirate radio networks.

7. Trans-Oceanic - Wikipedia

   en.wikipedia.org/wiki/Trans-Oceanic

   Another first for portable radios was the unique dial scale used in the 1000 and later series of Trans-Oceanics. The 1000 was designed with a cylinder dial scale that would rotate with the band switch allowing only that particular band scale to show. [9] Zenith Royal 1000 All Transistor Trans-Oceanic Short Wave Portable Radio, circa 1957.