2N6678 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 400 V
• Collector-Base Voltage, max: 650 V
• Emitter-Base Voltage, max: 8 V
• Collector Current − Continuous, max: 15 A
• Collector Dissipation: 175 W
• DC Current Gain (h_fe): 8
• Transition Frequency, min: 3 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 2N6678 with the 2N6547, 2SC2429, 2SC2429A, 2SC2920, 2SC3058, 2SC3058A, BUX48, BUX48A, BUX48B, BUX48C or MJ10001.