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The magic eye (also called a cat's eye, or tuning eye in North America) is a specific type of such a tube with a circular display similar to the EM34 illustrated. Its first broad application was as a tuning indicator in radio receivers , to give an indication of the relative strength of the received radio signal, to show when a radio station ...
6G-B8 – Beam power tube; 6G-E12A – 2-channel "Magic Eye"-type tuning indicator, ... (Except for heater, electronically identical to types 6E5 and 6G5) CRT anode ...
Magic Eye tube used for tuning in a 1939 Mission Bell Model 410 radio. (green glow) In 1932, DuMont invented the magic eye tube, or Electron Ray Tube, [14] used as a tuning accessory in radios and as a level meter in mono and stereo home reel-to-reel tape recorders. In the 1930s the manufacture of mechanical panel meters were labor-intensive ...
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Ye (Russian: Е) – Magic eye tube (e.g. used as a tuning indicator). U (Russian: У ) – Power triode (was soon deprecated). The 3rd element is a number – a series designator that differentiates between different devices of the same type.
Magic Eye is a series of books that feature autostereograms. After creating its first images in 1991, creator Tom Baccei worked with Tenyo, a Japanese company that ...
A beam tetrode, sometimes called a beam power tube, is a type of vacuum tube or thermionic valve that has two grids and forms the electron stream from the cathode into multiple partially collimated beams to produce a low potential space charge region between the anode and screen grid to return anode secondary emission electrons to the anode ...
Circuit symbol of a heptode. The development of the pentagrid or heptode (seven-electrode) valve was a novel development in the mixer story. The idea was to produce a single valve that not only mixed the oscillator signal and the received signal and produced its own oscillator signal at the same time but, importantly, did the mixing and the oscillating in different parts of the same valve.
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