Carlos is my hero, because I when I was five my father bought his first record player. And the first record he bought was Abraxas by Santana. And as a little kid the sound of this music made a deep impression on me.
Years ago I read an interview with carlos's guitar roadie. Carlos orders 10 amps, tries them all, and picks the ones with the best sound, and sends 8 back.
He also marks spots on the stage floor during the soundcheck, so he knows where to stand for the best sustain, I heard.
I saw him once live at North Sea Jazz. He was constantly busy with tone and volume knob on his guitar, adjusting almost after every note he played.
Carols says: "I'm very demanding about my sound. My tone is my voice."
I never tried the tube sreamer, but I expect something like that is going to work, because you need a compressed sort of overdrive that gives you the typical overtones and sustain.
It's not all about gear though, it's also the way you play guitar. Rhythm, frases, dynamics. Play like the guitar like a cuban trumpet player.