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2. All American Five - Wikipedia

   en.wikipedia.org/wiki/All_American_Five

   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.

3. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A fitting or adapter is used in pipe systems to connect sections of pipe (designated by nominal size, with greater tolerances of variance) or tube (designated by actual size, with lower tolerance for variance), adapt to different sizes or shapes, and for other purposes such as regulating (or measuring) fluid flow.

4. 6V6 - Wikipedia

   en.wikipedia.org/wiki/6V6

   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.

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6. Tube socket - Wikipedia

   en.wikipedia.org/wiki/Tube_socket

   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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8. List of Stax products - Wikipedia

   en.wikipedia.org/wiki/List_of_Stax_products

   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 2x Normal Bias, 2x RCA Solid state SRM-1 1979 370 V 1x RCA, 2x Normal Bias Solid state SRM-1 Pro 1981 370 V 1x RCA,

9. Headset (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Headset_(bicycle_part)

   The larger diameter of the head tube and headset gives added stiffness to the steering portion of the bicycle. Common sizes. 25.4 mm (1 in) steerer tube, this may have a fork crown (the base of the fork steerer tube) of a number of different dimensions, and milling may be necessary to make some headsets fit. 26.4 mm crown race (ISO standard)