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.
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This is a list of vacuum tubes or thermionic valves , and low-pressure gas-filled tubes , or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics. Many industrial, military or otherwise professional tubes were also produced. Only a few types are still used today, mainly in high-power, high-frequency applications. Receiving tubes have heaters or filaments intended for direct battery operation, parallel operation off a dedicated winding on a supply transformer, or series string operation on transformer-less sets. High-power RF power tubes are directly heated; the heater voltage must be much smaller than the signal voltage on the grid and is therefore in the In some valve part number series, the voltage class of the heater is given in the part number, and a similar valve might be available with several different heater voltage ratings. The system assigned numbers with the base form "1A21", and is therefore also referred to as the "1A21 system".
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