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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.
The name is an indication of the problem—the line cord contained resistors to drop the voltage and dissipated substantial power in the cord itself. When operating properly and the line cord was stretched to full length, the cord got "warm" and was safe enough (until the heat made the rubber insulation crack).
They were joined in 1921 by Eugene F. McDonald, [4] and Zenith Radio Company was incorporated in 1923. The fledgling company soon became known for its high-quality radios and electronic innovations. Zenith introduced the first portable radio in 1924, [ 4 ] [ 5 ] the first mass-produced AC radio in 1926, [ 5 ] and push-button tuning in 1927. [ 4 ]
The term All American Five (abbreviated AA5) is a colloquial name for mass-produced, superheterodyne radio receivers that used five vacuum tubes in their design. These radio sets were designed to receive amplitude modulation (AM) broadcasts in the medium wave band, and were manufactured in the United States from the mid-1930s until the early 1960s.
BC-342 radio receiver seen at bottom center, in use by Signal Corps operator in New Guinea BC-342 in Schweizerisches Militärmuseum Full The BC-342 could be operated from fixed and mobile positions. Power - An internal RA-20 AC rectifier power supply unit is fitted providing 250 volts DC and 12 volts AC for the receiver tube filaments (three ...
Since the length of the waves used with crystal radios is very long (AM broadcast band waves are 182–566 metres or 597–1,857 feet long) [56] the antenna is made as long as possible, [57] from a long wire, in contrast to the whip antennas or ferrite loopstick antennas used in modern radios.
The 1L6 was to be a specialty tube, produced in small quantities by very few manufacturers, mostly Sylvania for use by just a few manufacturers of shortwave portables, such as Zenith - in their Trans-Oceanics - and its short-lived rivals, such as the Hallicrafters TW-1000 and the RCA Strat-O-World and very few others. In fact, Zenith, Crosley ...
Vintage equipment in the Queen Mary radio room. Some hobbyists see vintage radio operation as a valuable asset to help preserve the history and heritage of radio for future generations. [3] They sometimes assist in the restoration and operation of vintage radio equipment for historical exhibits, museums, and historic ships or aircraft. [6]