2N6308 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 350 V
• Collector-Base Voltage, max: 700 V
• Emitter-Base Voltage, max: 8 V
• Collector Current − Continuous, max: 8 A
• Collector Dissipation: 125 W
• DC Current Gain (h_fe): 12 to 60
• Transition Frequency, min: 5 MHz
• Operating and Storage Junction Temperature Range: -65 to +200 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.You can replace the 2N6308 with the 2N6545, 2N6547, 2N6677, 2N6678, BUX48, BUX48A, MJ12021, MJ12022, MJ16006, MJ16008 or MJ8504.