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2. Magic eye tube - Wikipedia

   en.wikipedia.org/wiki/Magic_eye_tube

   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 ...

3. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   EZ-6G5 = 6G5 – Variable-mu "Magic Eye"-type tuning indicator; ... Tubes used in AC-powered radio receivers of the early 1930s 2A3 – Directly heated power triode, ...

4. List of Mullard–Philips vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_Mullard–Philips...

   EM1 (4678) – Top-view, "Magic Eye"-type tuning indicator, side-contact 8 Base; 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

5. Allen B. DuMont - Wikipedia

   en.wikipedia.org/wiki/Allen_B._DuMont

   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 ...

6. Gonset Communicator - Wikipedia

   en.wikipedia.org/wiki/Gonset_Communicator

   The Gonsets were among the first commercial radios available for the post-World War II amateur bands and helped popularize VHF for amateurs. [2] The Gonset Communicators were packaged in a square box with a carrying handle and a UHF connector for the antenna on top, making them quite portable. Early models had a magic eye tube tuning indicator ...

7. Vintage amateur radio - Wikipedia

   en.wikipedia.org/wiki/Vintage_amateur_radio

   The proliferation of integrated circuits in modern amateur radio equipment has made amateurs nostalgic for vacuum tube-based designs. Radios that contain solid state parts do not require frequent tinkering, whereas vacuum tube radio equipment is less predictable, lending routine radio contacts more excitement, and giving vintage amateur radio ...

8. Russian tube designations - Wikipedia

   en.wikipedia.org/wiki/Russian_tube_designations

   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.

9. RETMA tube designation - Wikipedia

   en.wikipedia.org/wiki/RETMA_tube_designation

   The Radio Electronics Television Manufacturers' Association was formed in 1953, as a result of mergers with other trade standards organisations, such as the RMA.It was principally responsible for the standardised nomenclature for American vacuum tubes - however the standard itself had already been in use for a long time before 1953; for example, the 6L6 was introduced in July 1936.