1971 Marshall JMP Bass 1986 model
Great sounding Marshall amp in a rare "small box" version. It has the 1986 Bass circuit which is less sharp and cutting than the 1987 lead model.
Many guitar players (Jimi Hendrix,...) preferred the bass versions. Still "point to point or hand wired", all original except for a changed power transformer, the switches and a fuse socket. It just had a professional maintenance.