The Paul McCartney amp used in the roof top video is not the Bassman 70. It is the 1968 silver face bassman. this is clear as the bassman 1968 has only 6 knobs and yours pictured (the bassman 70) as 70 the extra knob for Master Volume and Paul's on the roof top does not have that master volume knob. I paly McCartney in national Beatles show and I own the 1968 Silverface head he had.
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