I have a '78 Marshall JMP 2204 that was my first Marshall. I have thinned down to just one 2204 and one 1959 Super Lead as keepers. This 2204 has the chicklet caps in it and is totally stock including the bright cap. I'm pleased with the tone but wish I had more low end. I'm sure this info exists, but what component, location and value should I be looking at to increase the low end to get a better balance out of the Marshall. My '81 2204's had better low end.