Recognize that any good guitarists "sound" is in their fingers and pick usage. However, for the Live 73 USA Page "tone", it doesn't hurt to have gear close to what he had. He used Marshall (EL-34 and not KT88, yet) "Metal Panel" 100 watt Super Leads. The 72/73 versions were a bit brighter than previous years; some of the capacitors were different. Also, the original bridge Pickup in his #1 Les Paul had died just before the USA tour. It was replaced with a Gibson "T-Top", which was also brighter than the PAF it replaced.
Other than that, he made extensive use of his volume and tone knobs.
For effects, he did use a wah and a tape delay/echo machine.