Watch the Jimmy Page online guitar lesson by Jeff McErlain from Kings of Tone
Page's classic tone is a Les Paul through a Marshall. Although he often used many different amps in the studio, live it was a Marshall. His tone is basically fairly clean and somewhat unforgiving. It actually sounds like it would be quite difficult to play as opposed to Hendrix's tone around the same time. What is striking is all the different tones he did get on records often by using different amplifiers and miking techniques.