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 mids until the early s. Variations in the design for lower cost, shortwave bands, better performance or special power supplies existed, although many sets used an identical set of vacuum tubes. The radio was called the "All American Five" because the design represented the majority of radios manufactured for home use in the USA and Canada in the tube era. They were manufactured in the millions by hundreds of manufacturers from the s onward, with the last examples being made in Japan. The heaters of the tubes were connected in series, all consequently drawing the same current, but with different voltages across them. An extra dropper resistor was therefore not required. Transformerless designs had a metal chassis connected to one side of the power line, which was a dangerous electric shock hazard and required a thoroughly insulated cabinet. When operated on DC, they would only work if the plug was inserted with the correct polarity. The philosophy of the design was simple: it had to be as cheap to make as possible.


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We use cookies to improve our service for you. You can find more information in our data protection declaration. New cases for the Radio D reporters: In this audio course, follow Paula and Philipp across Germany as they investigate a mysterious laser attack in Jena and follow traces of the Berlin Wall. All listeners who are joining in for the second part of Radio D still have the opportunity in this first lesson to get to know the completely normal chaos of the office. A very special kind of race is supposed to take place here. Of course the two reporters from Radio D could not miss out on that. The villagers are all convinced that the Trabbi will win the race against the Porsche. But Philipp sees it very differently. What does the stranger know about the unusual race and what links him to Radio D?
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