I have a JF 59RR which is similar to the Mashall. The 59RR has far more gain than you need to cover the ACDC catalog. I use the JMP mode for anything before Highway to Hell and the JCM mode for everything after. I have to turn the gain back to around nine o'clock in jcm mode or it gets to heavy sounding. Make sure you get something that gets clean (moderate crunch) for ACDC .