need help to repair a ppi 4400am

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ok i could tell you the whole story about what as i did before in the wrong post tread
here is the short
ppi was leant to a friend who mess it up not sure how but notthing blow out just wasn't coming on so i carried it to fix but after about 7 months guy nver fixed it
and all the transistors were gone also the big ic next to the 2 big caps and sum resistors
i am goin an buy back all the parts for it but i was wondering
can i put in bigger transistors and get a little more power even if its jus 1w or more
the transistors that was there was 2n6487 npn and 2n6490 pnp i think that is correct if not please correct me i know bigger might mean more heat but i got some
also i might not be able get these parts where i am so what are sum suitable substitute to use
the ic i have no idea what is it part # or replacement if i can't get that original
next as i would put in all missing parts back and it doesn't come what might be the posible problems
i suspect he may have grounded sum wires probably the power wires
 
That's a 4200, not a 4400.

Post a photo of your amp.

You can't get more power by changing those transistors.

You wouldn't be likely to notice a power increase unless you doubled the power output. If you did modify the amp so that it produced more power, it would likely make it much less reliable.
 
Ok i think i should put in all the parts first and then if it doesn't power on then go through fixing it
ok so the original transistors are 2n6487 2n6490
i can't get these transistors where i am what's the best replacement for this
also i will be running the amp bridge so i hope the replacement can handle this
 
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