That's weird, because I have a hard time thinking of any albums that are even close to the fury that is on "Fun House." But I digress.
I've read in several places that Ron used a Maestro fuzz (the manufacturer of that pedal escapes me). I also know that he mostly played a Strat during the early lineup of the band, but I don't know why he decided to use a Flying V to record their first album.
But if you want to talk about pure Les Paul into cranked Marshall sound, that was James Williamson, who played guitar on "Raw Power." I read an interview with him where they were like, "So what pedals did you use back in the Stooges days?" And he replied, "None, just my guitar into the amp, dimed." And if you've heard this guy's tone...it's just further confirmation on how badass these guys really were.