Dennis was a big jackson and Marshall guy back then.Not exactly sure which Marshall tho.While he was on Michael Sweet's solo tour,I saw a lot of mesa studio,groove tubes preamp,and mesa triaxis in thier racks on stage then...another bit of info is shortly after that tour,customs was giving him some issues with ,always coming across the border from canada,so Shredder Joey Taffola took his place.I had lunch with that version of Michael's band too .