This is the Master Model 50 Watt MKII Lead version and is in great condition for it's age.

The 1978 Marshall JMP MK 2 Master Model Guitar Amp is a rock masterpiece that’s seen more action in studio and stage than any other amp of it kind. This vintage Marshall amp became the go-to weapon of choice for many famous players on many famous hard rock and metal songs. Due to consumer pressure from players wanting more gain and not wanting to have their current Marshall amps modified by local techs to achieve more overdrive gain, Marshall chose to trade in the separate vintage style dual channel preamp design it featured on all of the previous models. They opted to use the extra left over triode for more preamp overdrive gain which allowed for the use of a master volume control for lower volume high gain rock tones. The new input feature hi and low gain sensitivity – the low gain input actually by-passed the first triode gain stage to achieve its cleaner and more glassy tones.

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