TRANSISTOR MUSEUM  

Historic Transistor Photo Gallery   

 

 

Transistor Size (1/2” Diameter X 3/4” H)

Date Code 6221 (1962 Week 21)

 

Packaging- Cardboard Flat Pack

 

RAYTHEON CK311

 

TYPE

Germanium PNP Power Alloy Junction

 

USAGE

Audio/Military 

 

DATE INTRODUCED

1960s

 

CASE STYLES

Silver Metal

 

AVAILABILITY

Rare (Low Volume Production)

 

 

 

HISTORIC NOTES

The Raytheon CK311 is a unique vintage germanium power transistor in several respects. Most interesting is the fact that this device was sold in a vacuum tube cardboard package – this occurred very early in transistor history, when a few of the first transistor manufacturers used existing tube boxes for their first transistors, but the CK311 was sold in the 1960s, about a decade after the first transistors.  Another interesting feature of the CK311 is that it is a relabeled CBS transistor (2N156 style), and reflects the fact that Raytheon had bought the CBS Hytron company in the late 1950s and continued to manufacture the existing CBS transistors.  Finally, Raytheon was not known as a power transistor manufacturer, so any Raytheon power device, especially one that uses the proprietary and famous Raytheon “CK” numbering system is unique indeed.   The CK311 sold for $8.65 in the 1963 Arrow Electronics catalogue.

 

Copyright © 2004 by Jack Ward

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