2SA733 are just general purpose transistors. BC557 will work but the pinout is different.
2SC2229 is a high speed low capacitance driver transistor. The BD139 is not a good substitute, it is too slow and not high enough voltage. The only currently manufactured part that would substitute well is Fairchild KSC3503
2SC2229 is a high speed low capacitance driver transistor. The BD139 is not a good substitute, it is too slow and not high enough voltage. The only currently manufactured part that would substitute well is Fairchild KSC3503
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