How did bands like The Rolling Stones and Led Zeppelin record that overdriven harmonica sound in songs like Midnight Rambler, When The Levee Breaks, etc.?
I've had great results by using a guitar amp, I like the old Gretsh 1x10 "practice" amps for this duty.
I had the harp player use the studio's 441.
I mic'ed the amp with a Coles 4038 through a Helios console straight to tape.