Power Transistor Difference?

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Ok...

I have amplifier originali build with pair of MJ 15003/15004 on +/- 42 V rails.


I tried to swap these output's with 2sa1302/2sc5200 and I have feeling that my amp is not as powerfull as with MJ15XXX transistors.
Am I wrong or there is difference?

From my perspective it looks that MJ15003/15004 are really very good trasistors.
:cannotbe:
 
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