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This follow up video on the Marshall Origin 20 Watt Guitar amp is about the bias and the power scaling, and to check if I had made a mistake when biasing this amp. It turned out that I hadn't made a mistake but I had missed out some useful information which was pointed out by a watcher on the channel. In this video we go through what I should have put in the first video. More problems with this amp were also pointed out in the comments form one of the best guitar amp techs on on you tube. This amp seems to have world full of design problems.