2N6510 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 200 V
• Collector-Base Voltage, max: 250 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 7 A
• Collector Dissipation: 120 W
• DC Current Gain (h_fe): 10 to 50
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-3

Here is an image showing the pin diagram of this transistor.You can replace the 2N6510 with the 2N6249, 2N6250, 2N6251, 2N6511, 2N6512, 2N6513, 2N6514, 2N6676, 2N6677, 2N6678 or BUX48.