BUX83 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 450 V
• Collector-Base Voltage, max: 1000 V
• Emitter-Base Voltage, max: 10 V
• Collector Current − Continuous, max: 6 A
• Collector Dissipation: 75 W
• DC Current Gain (h_fe): 30
• Transition Frequency, min: 6 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 BUX83 with the BUX81.