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I don't use this old circuit. It and a pcb design are shown in the datasheet for the TDA2030A amplifier IC.At first,can you tell me your using of this circuit?
Until the TDA2030 is drawing more than about 900 mA, the current through the output transistors is zero.also, the supply current for the chip sets the bias for the output transistors, so there's no bias adjustment. this means that most likely the transistors will run a bit hot, since they're probably running a high bias current. the chip will control this to an extent if it's mounted on the same heat sink as the transistors, but it looks like a thermal nightmare....