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thats why i bought it was for my 148f ive had 667s before and they're sure not what they used to be. .y 148 will dead key about 2 1/2 to 3 watts and swing about 15 on am and will do 18 to 20 on ssb, the same radio used to drive my old 667 make close to 700 watts, these new ones the hybrid ones its all it can do to hit 500 i think maybe a little below to be honest. Im thinking upgrade to the power in wires will do wonders, i used 6 ga from an optima battery all the way in, this new 667 has dinky wires same size wires as my 2 pill ts amp