I know that the JCM900(maybe not all models) and the JCM600 have diode-clipping doing to do the distortions (kinda like in distortionpedals). I came across a experienced ampbuilder who rebuilt this to "real" tube-distorsion. Does anybody know how this works and if it's possible to do it on your own. I have some experience in electronics but I never done anything with a tubeamp before.....

I would be really grateful if someone could help me