Not a good idea, the bd139 will be better, the cob of the transistor is very important here, the cob of the 2sb649 or 2sc4793 is in the order of 20 - 30pf at 10v vcb while the bd is maybe around 4 to 5, if you want to improve the circuit change your output transistors, 2n3055 are really not so good for audio.
For input stage transistor the low noise type ksc1845 ksa992. 2sc2240 2sa970. Best transistors for VAS stage are the video output driver transistors of crt monitors and hdtv. like ksa 1381 , ksc 3503. for driver transistors the 2sc4793-2sa1837.
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