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I don’t care what YouTube tech told you that you’d gain power by just swapping in those finals and those finals only, I’ll say he’s wrong. I don’t care if he has 125yrs of experience. That circuit is designed for the transistors that are in it from the factory. And you won’t have the gain needed to reach some massive power level, not without additional work.

If you could, everybody would just build the same radio, the same way. I’ve personally seen those very transistors swapped into a radio and there was very minimal power gained because nothing else was changed. And if you only gain 5, maybe 10 watts peak, what have you actually accomplished? Nothing.

I wasn’t trying to be condescending in my comment, I was only making a statement, typing what I was thinking. It’s your radio and you already have the transistors, swap away. But when you don’t see massive power gains don’t be surprised. Now possibly if you rework the entire output side to supply enough drive to those transistors then you’ll possibly see a big enough increase to make it worth your time and effort.

Otherwise, I agree, if it’s not broke then don’t try to fix it and if it’s not doing what you want then don’t throw money at it (down the drain). You’d be better better off getting an amp or just buying a totally different radio.