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The '''2N2207''' (Tek part number 151-063) is a germanium PNP transistor with | The '''2N2207''' (Tek part number 151-063) is a [[Germanium transistors|germanium PNP transistor]] with | ||
* f<sub>t</sub>= 140 MHz | * f<sub>t</sub>= 140 MHz | ||
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The 2N2207 is used in a variety of 1960s Tektronix equipment including the [[3B1]], [[547]], [[321|321A]], and [[3B3]]. | The 2N2207 is used in a variety of 1960s Tektronix equipment including the [[3B1]], [[547]], [[321|321A]], and [[3B3]]. | ||
Due to tin | Due to [[Germanium transistors|tin whiskers growing inside the case]], 2N2207 are a common source of problems on equipment of the period. | ||
In most (but not all) circuits, a failed 2N2207 can be replaced with a modern silicon PNP transistor. | In most (but not all) circuits, a failed 2N2207 can be replaced with a modern silicon PNP transistor. | ||
Such a replacement may need to involve several coupled transistors/diodes (see link for an example). | Such a replacement may need to involve several coupled transistors/diodes (see link for an example). | ||
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==Links== | ==Links== | ||
* [https://groups.io/g/TekScopes/message/35340 321A 2N2207 transistor replacement] | * [https://groups.io/g/TekScopes/message/35340 321A 2N2207 transistor replacement] | ||
* [https://nepp.nasa.gov/whisker/anecdote/af114-transistor/index.html | |||
==Pictures== | ==Pictures== |