Everyone has a tonal influence that a fellow guitarist somewhere in our travels made an indelible mark on our playing ! For me it was Rory Gallagher. He had talent, style and attitude . I saw him four times. He got the best blues rock tone ever by using a Strat, his trusted AC30 & 2 late 70's Marshall 50 watt combos. The sound was truly awe inspiring because he achieved massive drive and sustain for his solos , and crunch and clean for his rhythm work. I don't think he used attenuators to get his sound basically it was a rangemaster and later on a tubescreamer plus his amps were pumping serious volume.