McCartney used flatwounds and a Fender Bassman 100 amp 2X15's....I use a Tube amp, a Mesa 400+ with two 2X12's for a better bottom end....the graphic equalizer will determine what sound you're trying to achieve.....I'm going to try the Ric Nickel Roundwound Strings this week....flatwounds only give yo one sound...I use a Ric 4001 V63
