Help with power transistors !

[truenoteno]

I have constructed the DC-AC inverter by Tony Van Roon.
I don't have the TIP41 or TIP42 transistors so i replaced them with 548 and 558 transistors.
i put the output through a transformer and it works(120VAC).
but when i replace them with the JE2995 and the 3055 the transformer steps down the voltage, i've tried both ways on the transformer.
Maybe it doens't work that way, how can i make this circuit more powerful (300W)?

i measured the voltage without the transformer with the power transistors and the voltage appears OK.
i replaced the transformer but same thing happens.

 

[Sebi]

TIP series is power transistor in TO-220 package, not changeable with small signal transistors e.g.558. Use BD241 for NPN,BD242 for PNP position. (or BD139,140) Small signal transistors can't produced enough base current for output transistors...

 

[truenoteno]

i fixed it !!

i got my pinouts wrong, now i have a tip3055 and a je2955
thanks anyway