This part is a kind of semiconductor called 2SB474.
Function of this product has Audio Frequency High Power Amplifier.
Manufacturers : Sanyo
Image and pinout :

Some of the text within the PDF file :
Free Datasheet http://www.datasheetlist.com/ Free Datasheet http://www.datasheetlist.com/ Free Datasheet http://www.datasheetlist.com/ Free Datasheet http://www.datasheetlist.com/ [ ... ]
2SB474 PDF Datasheet Download
