TRANSISTOR MUSEUM™  

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. 

 

 

Copyright © 2005 by Jack Ward. All Rights Reserved.  http://www.transistormuseum.com/

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