Quote:
Originally Posted by wareagle
ye thts it. 2 inputs, side by side. it has normal and preamp. is normal master? im guessing master is the only volume control. the jmp is definatly non master. they didnt even make master volumes until the 80s right?
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They should be labeled Master and Pre amp. You can see a diagram of the front panel here:
Marshall Amps :: Heritage
The first MV Marshalls were JMPs and showed up late '75 with the first full production year being '76.