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The 2N2207 (Tek part number 151-063) is a germanium PNP transistor with

  • ft= 140 MHz
  • IC (max) = 50 mA
  • hfe (min) = 36

The 2N2207 is used in a variety of 1960s Tektronix equipment including the 3B1, 547, 321A, and 3B3.

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).