NTE128 NPN Silicon Transistor, audio output / video driver
The NTE128 is a silicon complementary transistor in a TO39 type pack-age designed primarily for amplifier and switching applications. These devices features high break-down 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 - NTE128 (Adobe Reader required to read datasheet)