The Allman Brothers Band across 2 famous tones — mostly through Marshall Plexi 1959SLP head into Marshall 4x12 cabinet with JBL D120F speakers, 100W 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 4.5 · bass 6 · mid 6.5 · treble 6.5 · presence 5.5 (out of 10)