2-inch quadruplex videotape (also called 2" quad video tape or quadraplex) was the first practical and commercially successful analog recording video tape format. The format uses 2-inch-wide (51 mm) magnetic tape and was developed and released for the broadcast television industry in 1956 by Ampex, an American company based in Redwood City, California.
2-inch quadruplex videotape (also called 2" quad video tape or quadraplex) was the first practical and commercially successful analog recording video tape format. The format uses 2-inch-wide (51 mm) magnetic tape and was developed and released for the broadcast television industry in 1956 by Ampex, an American company based in Redwood City, California.
Source: Wikipedia "Quadruplex videotape" · CC BY-SA 4.0
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