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2. 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.

3. Transistor radio - Wikipedia

   en.wikipedia.org/wiki/Transistor_radio

   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.

4. AC/DC receiver design - Wikipedia

   en.wikipedia.org/wiki/AC/DC_receiver_design

   One common approach was to design a battery-powered radio (typically 6 volts DC from four dry cells) but include a small built-in step down transformer and rectifier to allow mains electricity (120 V or 240 V AC, depending on region) as an alternative to battery-powered operation.

5. 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.

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. Shortwave radio receiver - Wikipedia

   en.wikipedia.org/wiki/Shortwave_radio_receiver

   Modern Icom RC-9500 shortwave communications receiver. Modern battery-operated portable shortwave radio receivers often called world radio or world band receivers are marketed primarily to those wishing to receive international broadcasts, and are offered in a range of compact "travel size" to smaller "pocket size" units.