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Amperex Electronic Corporation
Amperex was a long established manufacturer of transmitting tubes when they were acquired by the Dutch firm, Phillips around 1955.
"A SURVEY OF EARLY POWER TRANSISTORS by Joe A. Knight, AMPEREX 1950s GERMANIUM POWER TRANSISTORS," TRANSISTOR MUSEUM, http://semiconductormuseum.com/Transistors/LectureHall/JoeKnight/JoeKnight_EarlyPowerTransistorHistory_Amperex_Index.htm" (accessed 08/18/2014) [unvetted]
"AMPEREX," Vintage tube services, http://vintagetubeservices.com/page9.html (accessed 08/18/2014) [unvetted]