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Amperex web site (December 9, 2009): Amperex was originally an American brand with plants in Hicksville, Long Island, NY, Slattersville, RI and Cranston, RI. They produced receiving, transmitting and special purpose tubes. In the 70's they developed a close relationship with North American Philips to market European tubes. As evidenced by the third box NAP became the full owner sometime in the late 70's, apparently to get a foot in the door to US tube sales. Ultimately Philips bought Sylvania and the entire ECG line giving them ownership of two major US tube names, albiet the waning years of tubes. Amperex was a premium grade tube made in their own factories and then in Philips owned factories or purchased from other first line manufacturers. Their EIA/RETMA code was 111. Many of their tubes have the well-known GE frosted dots, indicating from whom they were purchased. The Amperex name is now owned by Richardson.
Located at 79 Washington Street in Brooklyn, New York, Amperex was a long established manufacturer of transmitting tubes when they were acquired by the giant Dutch firm, Phillips in 1955 or so. Phillips continued to improve and enlarge the transmitting plant in New York, but also used the Amperex name to distribute their fine new line of Dutch made minis, (12AX7, 12AU7, 12AT7) to feed the booming U.S. Hi-Fi market. These sweet & airy, but still full and solid sounding tubes have been the favorite of music lovers for 45 years!Â Classic Hi-fi brands such as Marantz, Fisher, Scott, etc...Â owe a large part of their great sound to these tubes.Â In the line up of the three sisters, the three European sisters that is, the Amperex is like the fair-haired Dutch blond. The Telefunken is the tall, well built, sandy haired blond in the family, and the Mullard is the ravishing black haired, British brunette. These are of course just slight "hues" in the perspective that these tubes present, as they are really all extremely transparent units.Â And of course we can't forget the 6DJ8, 6922 & 7308 frame grid tubes. Developed by Amperex in 1958 when transistors were already starting to take over the electronics industry & originally developed for video & radar use, the 6DJ8 has come into heavy use in audio over the last 15 years. And Amperex definitely made some great ones like the Original "Bugle Boy" series with it's seemingly, magical ability to filter out noise like the Mullards do, and the later, map versions with their full, balanced sound, black background, and great sound staging.