Marshall Master Model Mk2 Head

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In the mid-1970s, Marshall introduced the "master volume" ("MV") series, which was initially called the "JMP" ("Jim Marshall Products"). This was in response to the demand for yet more distortion, and many techs, had been modifying the amps for years by connecting the two input stages in series rather than parallel as in the original Marshalls. A master volume was introduced to make the volume levels more manageable. Per Rick Reinckens, who was a short-term Unicord employee electronic technician who tested the first units when they arrived from England, Tony Frank, Unicord's chief design engineer, came up with the idea for a dual-volume-control. This gave the new breed of Marshalls a different voice, more cutting and edgy, which later found favour with players such as Randy Rhoads, Zakk Wylde and Slash. The 1959 and 1987 non-master volume models also continued under the JMP line, but their voicing became slightly harder/brighter during the 1970s.

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