Mesa Boogie Mark III around the AJFA period. Combination of Diezel VH-4 and Mesa Rectifiers/TriAxis just now. Caparison Guitars and Framus Cobra amps. It sounds cool I think. Some of Hetfield's rhythm tones are near impossible to beat for metal. Perfect example: Live Shit: Bing & Purge, San Diego. Creeping Death. The riff with Hetfield playing on his own (main riff). That tone owns! But yes you are correct, the production on AJFA was horrific. That (for songs) is my favourite Metallica album. I think that as far as lead tones go, Zakk Wylde and Dimebag have the best. With DamagePlan, Dime's tone wasn't AS good. Just listen to Trendkill (any of it) or the solo in Walk for examples. As for Zakk, crushing! Rhythm tone: Hetfield around Black Album time was good, it's a bit off nowadays though. Also, Pissing Razors have a GREAT rhythm tone, very powerful. It's a combo of ESP, EMG and Mesa. A combo I use and love!