NTE129 PNP silicon transistor, audio output, video driver
The NTE129 is a silicon transistor in a TO39 type package designed primarily for amplifier and switching applications. These devices features high breakdown voltages, low leakage currents, low capacity, and a beta useful over an extremely wide current range.
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Image for illustrative purpose only

Manufacturer datasheet - NTE129 (Adobe Reader required to read datasheet)