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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.
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.
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 ...
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.
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 ...
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.
A flash is a device used in photography that produces a brief burst of light (typically lasting 1⁄1000 to 1⁄200 of a second) at a color temperature of about 5,500 K (5,230 °C; 9,440 °F) [ 1 ][citation needed] to help illuminate a scene. A major purpose of a flash is to illuminate a dark scene.
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