Raytheon CK718  
Written by Accutron on 2017-01-29  

Introduced in late 1952, the Raytheon CK718 germanium PNP transistor is believed to be the first mass-produced junction transistor. The CK718 was not made available to consumers, but was instead supplied exclusively to a number of hearing aid manufacturers.

Raytheon CK718 germanium PNP transistor.

CK718, 1953 date code.

This article is part of the [Discrete Semiconductors] exhibit.

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