For sale is a used 1978 Marshall JMP MKII Super Lead 100 Watt Tube Head. This amp is in very good condition with dings and some wear in the Tolex. There are added bass and treble boost mods installed on the back of the head. They offer a pretty cool tonal variation and are inconspicuous on the back. Besides possibly the filter caps, everything else on the head is original. The tubes are Sovtek 6550s and have plenty of life left in them.