Source: http://rockguitardaily.blogspot.de/2013/05/monster-truck-furiosity-in-conversation.html "I combined that with a 1974 or '75 Marshall JMP, and that is not my amp. It was one that was in the family of engineers and producers we were working with on the record. It's really a rare JMP - it's a Canadian Marshall, and there's not a lot of those."more
Mine is made in 1975 and has just one sound..all knobs to 10 and here is AC/DC sound!I use it only for studio sessions.High channel 1 and 2 jumped to low channel 2.I use it with a Marshall 4X12 cabinet loaded with rear Rola Celestion G12-18 15 ohms Amazing amp!