BUY 2N4921 https://www.utsource.net/itm/p/600524.html
Medium-Power Plastic NPN Silicon Transistor1A，30W，40V（-），，NPN
Description: The 2N4921 is a NPN Silicon Transistor in a TO-126 package. Features: Low Collector-Emitter Saturation Voltage High Current Gain Bandwidth Product High DC Current Gain Low Noise High Input Impedance Applications: Audio Amplifiers General Purpose Amplifiers Switches High Speed Switching Applications (For reference only)