Hey guys, i've been looking through the schematics of my amp which is a JCM800 1987 built in 1987, i've found some schematics dated for 1988. Which seem to fit my amp, http://www.drtube.com/schematics/marshall/jcm800pw.gif ^^ This is the earlier JCM800 50watt power section http://www.drtube.com/schematics/marshall/1987pwrm.gif ^^ This is the later JCM800 50watt power section I can see differences in the power filtering they've added another 50uf+50uf cap in the later version, and if im correct this matches up to the late 70s metal panel design and the one with less filtering matches up to the earlier 60s power filtering design? now correct me if im wrong, wasn't marshall trying to cut costs back then? and this to me seems the wrong way around. I know they cut filtering out of the JCM800 2203 model, so why is this anyone goy any theories? and am i barking up the wrong tree?