Transistor Museum Photo Gallery Raytheon Blues Germanium Transistor Hobby

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Historic Transistor Photo Gallery

Raytheon Blues – “All the Blues”

“2N” TYPES	COMMENTS	“CK” TYPES	COMMENTS
2N63	Equiv to CK722 and 2N130	CK721	Equiv to 2N64 and 2N131
2N64	Equiv to CK721 and 2N131	CK722	Equiv to 2N63 and 2N130
2N65	Equiv to CK725 and 2N132	CK725	Equiv to 2N65 and 2N132
2N106	Equiv to 2N133	CK726	Hearing aid transistor
2N111	Equiv to CK759	CK750-1	Experimental power transistor
2N111A	Equiv to CK759A	CK753	Production power transistor
2N112	Equiv to CK760	CK758
2N112A	Equiv to CK760A	CK759	Equiv to 2N111
2N113	Equiv to CK761	CK759A	Equiv to 2N111A
2N114	Equiv to CK762	CK760	Equiv to 2N112
2N130	Equiv to CK722 and 2N63	CK760A	Equiv to 2N112A
2N130A		CK761	Equiv to 2N113
2N131	Equiv to CK721 and 2N64	CK762	Equiv to 2N114
2N131A		CK766	Equiv to 2N271
2N132	Equiv to CK725 and 2N65	CK766A	Equiv to 2N271A
2N132A		CK768	Hobbyist RF transistor
2N133	Equiv to 2N106	CK782	Hearing aid transistor
2N133A		CK783	Hearing aid transistor
2N138		CK784	Hearing aid transistor
2N138A		CK785	Hearing aid transistor
2N138B		CK900	Quad transistors in single package
2N271	Equiv to CK766	CK901	Dual transistors in single package
2N271A	Equiv to CK766A	Unmarked	Some have “ES” (Eng Sample)

Photo Essay Commentary

This is a list of all known blue Raytheon transistors, as referenced in published literature or as represented with known samples. The date codes for these different units range from 1955 to the late 1950s. The uses of all these types range from hobbyist/experimenter units (CK721, CK722, CK768) to production units used in radios (the CK76X types) to general purpose types (2N138) and to unusual/developmental types (CK750-1, CK900).

This total of 46 types of “Raytheon Blues”, manufactured for only a short time in the 1950s, has made a long-standing impact on the history of transistor technology and represents a unique and historic contribution by one of the first major producers of germanium transistors.

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