current gain of 15 and 7.5 A output current. a current gain of 75 and sources 1.5 A, 0.5 A to each output 2N3055. The pre-driver is supplied by 5 V and may source around 20 mA (3V/150 ohm) to 2N3055 driver. Calculating with typical 2N3055 current gains, you can easily see, why. I don't see any power or current notice in the schematic, and I basically doubt that it's capable to deliver 500 W in the present dimensioning. Paralleling of BJT without emitter resistances isn't guaranteed to give balanced current distribution normally.However, in this case, I think it's O.K., cause the CE saturation resistance achieves a balance. I understand, that you connected three 2N3055 in parallel as mentioned in the text.
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