BUY MJ10012 https://www.utsource.net/itm/p/163066.html
Bipolar Transistor; Package/Case:TO-3; Current Rating:10A; Voltage Rating:600V
Package: TO3 Manufacturer: ON/MOT Description: The MJ10012 is a high-power NPN silicon transistor designed for general purpose amplifier and switching applications. Features: High DC Current Gain Low Saturation Voltage High Switching Speed High Voltage High Power Dissipation Low Noise Low Leakage Current High Reliability Applications: Audio Amplifiers Motor Control Power Supplies Switching Regulators High-Voltage Power Supplies High-Frequency Inverters High-Speed Switching Applications (For reference only)