My friend Mikey has been Joe's tech for a long time.. seen it and played it.. the four 60's heads and cabs behind the plexi wall are basically Joe's stage volume monitors.. BEHIND those are a couple of DSL heads feeding Palmers and those are what the FOH hears..
the tube screamer is a stock made in China for sale at GC one with NO mods.. Joe said he A/B'd Keeley, Analogman, Ibanez, the hard wire re-issue , the Maxon.. you name it.. and he prefers the current stock model.