The thing is, back in the early days when the Marshall were first created, P.A. systems were nothing like what's available now, so bands had to use loud amps onstage just to compete with the drummer and the crowds that came to see them, I remember watching a video on youtube of the Beatles performing onstage with their Vox AC30s and Vox Bass amp, the Vox AC30 was rated to put out 30 Watts of audio power, to be honest I couldn't hear the Beatles over the screaming crowd.

In the early days of Rock N Roll, guitarists were using low wattage amps that were designed in the 50's, and then Vox created the AC10, and the AC15, Dick Denney is the man responsible for creating the Vox AC30, personally, I would absolutely love to get my hands on an original Vox AC30 in decent condition, but they are expensive as.