The 2N2207 (Tek part number 151-063) is a germanium PNP transistor with
- ft= 140 MHz
- IC (max) = 50 mA
- hfe (min) = 36
Due to 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. Such a replacement may need to involve several coupled transistors/diodes (see link for an example).
- 321A 2N2207 transistor replacement