The KST42 is a SMD package NPN Transistor that has high collector emitter voltage of 300V and a collector current of 500mA. The transistor is a general purpose transistor and can be used for both switching and amplification purpose.
The NTE159M is a general purpose PNP transistor with a maximum gain of 300 and collector current of 600mA. It has a low collector saturation voltage of 1V and can be used in switching and amplifier circuits.
The 2SC5200 is a high power NPN Transistor with a collector to emitter voltage of 230V and collector current of 30A. The transistor is available in TO-264 package and is commonly used Amplifier designs.
The 2N547 is an age old JFET that was commonly used in Pre-Amp circuits. The JFET has VDS of 25V and VGS of 25V with a Gate current of 10mA. The FET also has high Input Impedance and Low Input Capacitance.