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2. Transistor radio - Wikipedia

   en.wikipedia.org/wiki/Transistor_radio

   The typical portable tube radio of the fifties was about the size and weight of a lunchbox and contained several heavy, non-rechargeable batteries—one or more so-called "A" batteries to heat the tube filaments and a large 45- to 90-volt "B" battery to power the signal circuits. By comparison, the transistor radio could fit in a pocket and ...

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. Weltron - Wikipedia

   en.wikipedia.org/wiki/Weltron

   2001 – a portable AM/FM audio receiver with 8-track player (c. 1970). Commonly known as the "Spaceball". 2002 – a portable AM/FM audio receiver (c. 1972) 2003 – a pair of spherical speakers (c. 1972) 2004 – a portable AM/FM audio receiver with compact cassette recorder; 2005 – a vinyl turntable with integrated AM/FM audio receiver and ...

5. These Are the Best Emergency Radios to Keep You Updated ...

   www.aol.com/best-emergency-radios-keep-updated...

   The best emergency weather radios are compact, portable, durable, and have backup power sources—via hand crank, batteries, or solar panels—so you’re never caught with a dead radio.

6. List of radios - Wikipedia

   en.wikipedia.org/wiki/List_of_radios

   It was designed by G.D. Reynolds of Murphy Radio. Both AC and battery-operated versions were made. [7] [8] [9] Walkman – The original Walkman, released in 1979, was a portable cassette player. The Walkman brand was later extended to serve most of Sony's portable audio devices as well as related media devices, including radio receivers.

7. Radio receiver - Wikipedia

   en.wikipedia.org/wiki/Radio_receiver

   Portable radios typically are small enough to be hand held, or, for larger radios, have a handle or carrying strap. Portable radios may have an arrangement for powering from an outlet, conserving the batteries when an outlet is available. Portable "emergency" radios may be solar and/or hand crank powered. [7] Boom box - a portable battery ...