Demo and showcase of a 1969/1970 Marshall JMP Super Lead (model 1959) We're playing it with a Gibson ES335 and a Gibson Firebird VII Non reverse. The cab is a 1971 Basketweave 1982A with stock G12H30 55Hz Greenbacks (Pulsonic Cones). The close mic (1foot) is a 1970s Unidyne IV 548 and the room mic (20 feet) is an SM57. We open up the amp and look inside as well, at circuit, transformers and tubes etc.