Gus Fallgren, Al Hankinson and Dick Wright Transistor Museum Historic Profile
Recognizing Significant Contributions to 20^th Century Semiconductor History and Technology
The First “Transistor Powered” Trans-Atlantic Amateur Radio Contact
	RAYTHEON TRANSISTORS At upper left is a section of a 1955 Raytheon ad, confirming leadership in germanium transistor technology.  New “high frequency” devices - the CK760, CK761 and CK762, using the PNP fusion alloy process, were now available.  Shown above are production versions of these devices, all dated 1955.  Raytheon used a proprietary “CK” numbering system, and early devices used this and the standard “2N” system.  The Transatlantic Transmitter used two 2N113/CK761 transistors, rated at 10MC high frequency capability.  The “ES” samples used in the transmitter were provided by Frank Dukat, who was the transistor product manager in Norm Krim’s Semiconductor Products group.  The striking iridescent blue color of these early Raytheon transistors, and the equally appealing cardboard packaging (shown above) are easily identified characteristics of historic Raytheon germanium devices such as the CK761 and the more famous CK722.
Above is the schematic of the transmitter.  If you’d like to build one, use the link on the next page to view the construction details in the 1957 article. TransAtlantic Transistors, Page 6
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