Back in the early 80's James Hetfield used a modified Marshall JMP 2203 (the amp which later became the JCM800 2203) he used this amplifier up until 1984 because it got stolen. After the amp got stolen, James bought a JCM800 2203 and had it modified. These amplifiers can be seen on a lot of live footage of the early Metallica days as well as on the documentary "Some Kind Of Monster" You cab see the amplifier in this picture as well. https://www.flickr.com/photos/dyingindowney/2432208001more
When asked what amps he used in the studio: "A ‘68 Marshall Plexi Super Lead panned on one side of the stereo field and a Marshall JMP panned on the other side. Believe it or not, this was the first time I had ever played through a Marshall amp. I played both of them simultaneously through a Framptone Amp switcher with my signature Ibanez AT300 and AT100 guitars, which enabled me to play both amps with one guitar loud and clean using a tape echo and tube driver in front. For the album’s title track, I re-amped the Marshall through a Leslie 122 cabinet to get that swirling, Hendrix-y sound."more
In the Interview John says on the use of a 1978 Marshall JMP 100 on the Porcupine Tree records / live Gigs: "So I bought a modded 1978 JMP 100. It’s modded to hell and back – a guy named Mark Cameron modded it. That head is actually responsible for the last couple of records – The Incident and his solo record, and then one of my other Marshalls did most of the work on the record before that."more
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