Western Electric 7B  
Written by Accutron on 2018-01-12  

One of the last alloy junction devices produced by Western Electric, the 7B is an intermediate-power germanium PNP transistor intended for Bell System internal use. The 7B pictured here is an earlier example with a P-5 canister painted in grey lacquer, while later examples of the 7B are packaged in an updated P-6 canister with no evacuation nipple. Soon after the introduction of the 7B and allied devices in the late 1950s, Western Electric shifted production to diffused junction and planar transistors.


Western Electric 7B germanium PNP alloy junction transistor, manufactured in 1959.


7B alloy junction transistor, underside construction.

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

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