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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.
Driver Unit Model No. Release Year Output Voltage (RMS) Inputs Outputs Notes SRA-4S / SRA-6S 1960 2x Normal Bias Vacuum tube SRA-7S 1966 2x Normal Bias Vacuum tube SRA-8S 1967 350 V 2x Normal Bias Vacuum tube SRA-3S 1968 279 V 2x Normal Bias Vacuum tube / Solid state hybrid SRA-10S 1974 2x Normal Bias Solid state SRA-12S 1977 350 V 5x RCA
ST – Shouldered tube; GT – Glass tube; MT – Miniature tube, such as Noval B9A or Miniature 7-pin B7G; FL – Subminiature all-glass elliptical body and flat bases with long, inline "flying leads" (wire-ends) that are soldered into the circuit
Octal bases, as defined in IEC 60067, [10] diagram IEC 67-I-5a, have a 45-degree angle between pins, which form a 17.45 mm (11 ⁄ 16 in) diameter circle around a 7.82 mm (5 ⁄ 16 in) diameter keyed post (sometimes called a spigot) in the center. Octal sockets were designed to accept octal tubes, the rib in the keyed post fitting an indexing ...
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6V6 Octal socket basing diagram. 1 - * Unconnected in all versions except for the shell connection of the metal 6V6 2 & 7 - Filament / Heater 3 - Anode / Plate 4 - Grid 2 / Screen Grid 5 - Grid 1 / Control Grid 6 - No connection. Pin normally absent 8 - Cathode & Beam-Forming Plates. The 6V6 is a beam-power tetrode vacuum tube.
The magic eye tube (or valve) for tuning radio receivers was invented in 1932 by Allen B. DuMont (who spent most of the 1930s improving the lifetime of cathode ray tubes, and ultimately formed the DuMont Television Network). [5] [6] [7] The RCA 6E5 from 1935 was the first commercial tube. [8] [9]
The HY-69 is an 807 variant with a 5-pin base and a directly heated filamentary cathode operating at 6.3 V, 1.6 A. The 5933 / 807W is a ruggedized military version of the 807. It uses a shorter, straight-sided T12 bulb, which provides better element support for improved microphonics and shock/vibration resistance.