Metaltronix was a brand of high gain amps in the late 80's early nineties that Lee Jackson made. If memory serves me Lee use to mod and work on a lot of 80's shredders amps. He was very popular back then, funny you never hear his name around here. But Zakk endorsed the amp and used it for a time and I sold and worked on them at a shop on Sunset.
Actually the first time I met Zakk I was kind of a dick to him, I didn't know who he was and we were at a party and I was hammered as usual and there was a circle of us guys shootin the shit out in the yard and Zakk said 'I'm really excited I'm playing next week with Geezer', and I laughed in his face and said 'who Geezer Butler', he turned and scowled at me...lol It was Geezer Butler but in the end it was all good and I help keep his shitty Metaltronix amps alive for a time...lol