NTE Electronics NTE2317 NPN Silicon Transistor, High Voltage Fast Switching Power Darlington, TO3PN Type Package, 500V, 15 Amp: Amazon.com: Industrial & Scientific
NTE Electronics NTE379 NPN Silicon Transistor, Power Amp, High Voltage, Switch, TO220 Type Package, 700V, 12 Amp: Electronic Components: Amazon.com: Industrial & Scientific
Amazon.com: NTE Electronics NTE2514 PNP Silicon Complementary Transistor, High Current Switch, 60V, 8 Amp, 20ns Fall Time : Industrial & Scientific