I think Page had KT88's in his Super Lead.
But they all used Marshalls :twisted:
The Super Lead he used towards the band's later days after he stopped using the Major also had EL34s in it. The amp he had with KT88s is actually a 200 watt Marshall Major, I believe a '69 just like mine, and you can't run any other tube type in those things. Some people have put 6550s in them, which is stupid because they wont take the heat quite as well as their military grade version (KT88) and they eat KT88s fast enough.
For people back in the day that used EL34s? Well, Eric Clapton in the Cream era used EL34s. Before that, he used older Marshall stock, KT66s like Hendrix.
SRV used a ton of different amps, many Fenders (6L6) and some JTM45s (5881), his favorite amp was said to be a Major (KT88) and he bought a Dumble when he couldn't get tubes easily for that that probably used 6L6s, but I'm not sure....
I can't think of a list of EL34 artists right now.... other than Vai who comes to mind.... but it goes on and on.
I personally like EL34s the best because they're much warmer than anything else (other than it's small bro the EL84). 6L6/6550s are fatter, most importantly they have more bottom end, but dimed they just sound like EL34s with the master volume turned down a little.