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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 ...
EM2 – Top-view, "Magic Eye"-type tuning indicator; has a 6.3 V/200 mA heater and was therefore marketed as C/EM2; identical AM2 except for heater ratings EM4 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, EM34 with a side-contact 8 Base
Early models had a magic eye tube tuning indicator in front. The configuration earned them the name "Gooney Box." The radios could operate from 110 volt AC mains, or 6 or 12 volt DC from a car battery. A simple whip antenna could be plugged into the antenna connector on top.
One system prefixes a three-digit number with the letters "VT", presumably meaning "Vacuum Tube". Other systems prefix the number with the letters "JHS" or "JAN". The numbers following these prefixes can be "special" four-digit numbers, or domestic two- or three-digit numbers or simply the domestic North American "RETMA" numbering system.
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 ...
Learn how to download and install or uninstall the Desktop Gold software and if your computer meets the system requirements.
The older adult population in the United States is rapidly increasing as baby boomers continue to age. In 2020, the population of people over 65 grew almost five times faster than the total ...
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. The 4th element denotes vacuum tube construction (base, envelope):