This part is a kind of semiconductor called 2N6259.

Function of this product has Silicon NPN Transistor.

Manufacturers : NTE

Image and pinout :

Some of the text within the PDF file :

2N6259 Silicon NPN Transistor General Purpose, High Power Audio, Disk Head Positioner for Linear Applications Description: The 2N6259 is a silicon NPN power transistor in a TO3 type package designed for high power audio, disk head positioners, and other linear applications. Absolute Maximum Ratings: Collector−Emitter Voltage, VCEO(sus) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150V Collector−Emitter Voltage, VCEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170V Collector−Base Voltage, VCBO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170V Emitter−Base Voltage, VEBO . . . . . . . . . . . . . . . . . [ ... ]

2N6259 PDF Datasheet Download