The album is Tribute to the Gods. Next to Something Wicked, it's his best recorded tones ever, and right up there with the best I've ever heard. It's just thick, punishing, all-out assault. I think he's always played all rhythms in the studio, and of course layers them for that wall of sound, but Jon is also a beast as a player too.
Cities on Flame on that album sticks out for me, especially, as does Screaming For Vengeance. It's insanely good tone.
I'm a big fanboy too. Have all their stuff, and he's probably been the biggest influence on my rhythm playing for the last 20 years. Him and Hetfield.
This tone is nuts. Classic Rock, sledgehammer chunk.