Ratt across 2 famous tones — mostly through Marshall JCM 800 2203 head with Marshall 4x12 cabinet, Marshall, with humbuckers. Here is where to start, then adapt any of it to the guitar and amp you actually own.
Starting point (averaged): gain 7 · bass 5.5 · mid 6 · treble 7.5 · presence 6.5 (out of 10)