The TF65 is a germanium junction transistor that introduced in 1957. This transistor was made in both a silver and black cased version; the black version is shown here. This model of transistor is best known for it's use inside Kundo's line of electromagnetic pendulum clocks, which make use of the transistor in the pendulum drive circuit. The TF65 is a common point of failure in these clocks, requiring replacement with a more readily available germanium part number, the AC125 being the most common choice.
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