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.
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