Kerry King’s Signature Marshall JCM-800 Amps are shown at 7:35 in this video interview. He describes the amps saying “The one that this is based on is called the beast and I had it sent to Marshall to find out what was so great about it and see if anyone modded it over the years before I got it. The reason that head was so good, Marshall has parameters, and every transistor, everything has to be within this range. My entire head, everything was straight up. It was the perfect head. It’s how it was supposed to be and they don’t all come out like that, but that was the perfect one and they based this off of that.
He continues “It’s got the beast button which engages the assault mode and the assault mode’s got a built in gate because it’s basically taking my 10 band equalizer with a decimal boost and putting it in the head. And you can’t change the parameter, but it’s the parameter that I always had set. And you can add more or less of it. It’s really cool. I could go anywhere in the world and if this rig didn't show up, I don’t care, I’ll play through a cable if I have to. But if I have one of those heads, you wouldn’t notice any difference in my sound because I go directly into that.”