The majority of his sound came from a combination of a JCM 800 and plexi blended. Don’t know what cabs or speakers he used, but I do know they were both micd with sm57’s/MD421’s summed into one channel of a Neve 8068 and ran through an “army man” compressor, then to tape.
It’s hard to nail his studio tone with just a dual rec imo. Even though he’s seen using them live.