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hello to all

i have a philly made 148 gtl that i've change the pre-driver the driver and then the final and still with vr-10 wide open the best the radio will do is 4 1/2 watts and only swings to 5 1/2 the voltage regulatpr was upgraded. on ssb she does 18 bird watts. but on am she sucks any suggestion besides volting to get a little more out at least to make it swing to 7 or 8 watts.?? thanks