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  2. Sylvania Electric Products - Wikipedia

    en.wikipedia.org/wiki/Sylvania_Electric_Products

    Sylvania Electric Products. Sylvania Electric Products Inc. was an American manufacturer of diverse electrical equipment, including at various times radio transceivers, vacuum tubes, semiconductors, and mainframe computers such as MOBIDIC. They were one of the companies involved in the development of the COBOL programming language.

  3. Sylvania (brand) - Wikipedia

    en.wikipedia.org/wiki/Sylvania_(brand)

    Sylvania is a Canadian multinational electronics corporation headquartered in Toronto, Ontario, Canada. The company is owned in North America by Osram Sylvania and, outside of North America, Feilo Sylvania. The two license the brand to other companies for various products. The Sylvania brand was originally owned by Sylvania Electric Products.

  4. Tube tester - Wikipedia

    en.wikipedia.org/wiki/Tube_tester

    Tube tester. A tube tester is an electronic instrument designed to test certain characteristics of vacuum tubes (thermionic valves). Tube testers evolved along with the vacuum tube to satisfy the demands of the time, and their evolution ended with the tube era. The first tube testers were simple units designed for specific tubes to be used in ...

  5. Pentagrid converter - Wikipedia

    en.wikipedia.org/wiki/Pentagrid_converter

    Introduced by Sylvania in 1939 (and used mostly by Philco), this valve was the product of adding a suppressor grid to type 7B8, which was the loctal version of type 6A7. Adding the suppressor allowed Sylvania to lower the current of the 6.3-volt heater from 320 milliamperes [ 2 ] to 150 milliamperes [ 3 ] while maintaining the same conversion ...

  6. Keneth Alden Simons - Wikipedia

    en.wikipedia.org/wiki/Keneth_Alden_Simons

    Keneth Alden Simons At His Workbench in the 1950s. Keneth Alden Simons (March 10, 1913 – June 11, 2004) was an American electrical engineer best known for his pioneering contributions to the technical development of cable television in the United States, for the most part as chief engineer for the Jerrold Electronics Corporation.

  7. Flash (photography) - Wikipedia

    en.wikipedia.org/wiki/Flash_(photography)

    In 1965 Eastman Kodak of Rochester, New York replaced the individual flashbulb technology used on early Instamatic cameras with the Flashcube developed by Sylvania Electric Products. [12] [13] A flashcube was a module with four expendable flashbulbs, each mounted at 90° from the others in its own reflector.

  8. Sylvania - Wikipedia

    en.wikipedia.org/wiki/Sylvania

    Sylvania Electric Products, a former major American diversified electrical and electronics manufacturer. Sylvania (brand), its Canadian lighting products division which continues to license to both Havells Sylvania and Osram Sylvania. Osram Sylvania, an American lighting manufacturer owned by Osram AG of Germany.

  9. EL34 - Wikipedia

    en.wikipedia.org/wiki/EL34

    The EL34 is a thermionic vacuum tube of the power pentode type. The EL34 was introduced in 1955 by Mullard, who were owned by Philips. [1] The EL34 has an octal base (indicated by the '3' in the part number) and is found mainly in the final output stages of audio amplification circuits; it was also designed to be suitable as a series regulator by virtue of its high permissible voltage between ...

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