NTE Electronics NTE130 Silicon Power Transistor for Audio Power Amp, Medium Speed Switch, to-3 Case, 15A Continuous Collector Current, 100V Collector- Base Voltage: Communication Integrated Circuits: Amazon.com: Industrial & Scientific
Basic In Circuit Transistor Tester NPN/PNP 2 x LED [ Unassembled kit ] - - Amazon.com
2 Pieces 2N3055 NPN Transistor to-3 DIY Parts Base Installation Durable: Amazon.com: Industrial & Scientific
NTE Electronics NTE152 NPN Silicon Complementary Transistor for Audio Power Amplifier Switch, TO-220 Case, 4 Amp Collector Current, 90V Collector–Emitter Voltage: Communication Integrated Circuits: Amazon.com: Industrial & Scientific
Basic In Circuit Transistor Tester NPN/PNP 2 x LED Unassembled kit: Amazon.com: Industrial & Scientific
Transistor basics;: A short course: Stanley, George C: Amazon.com: Books