Has anyone here played a plexi with KT88 or 6550 tubes installed ? I have read that Jimmy Page had his amps modded to take these tubes and that Jimi Hendrix also used them but did not mod his amps. The reason I ask is not only am I a huge fan of both of them and their sound but also because my son has an Ampeg Lee Jackson amp that is supposed to be based on a Lee Jackson modified Marshall design. It has a switch that allows you to use either EL34's or KT88/6550 tubes and I really like the sound of the big tubes. I dont play hi gain and it seems there is more punch and clarity to the notes with the big tubes. My amp is a 50 watt plexi that has already been modded, it has a Mercury Magnetics transformer which seemed to increase headroom and punch compared to the stock and I was thinking that the tube mod might take it alittle further. I have to take the amp in to have the fx loop looked at and was considering the tube mod while it's in the shop.