BUY C3964 https://www.utsource.net/itm/p/11526118.html

Description: The C3964 is a NPN silicon transistor manufactured by KEC. Features: - Low collector-emitter saturation voltage - High current gain - Low noise - High breakdown voltage - High reliability Applications: The C3964 is suitable for use in a wide range of applications including audio amplifiers, switching circuits, and power supplies. (For reference only)