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I think it's from 74 it is missing the back plate and it does not have a serial number. it looks quite original, apart from the master volume mod. It sounds quite good, very big, what do you think?

Hello everyone, this is my first post here I bought this Marshall JCM800 today with .Be / Hbe sat, fat, c45 and solo bost, all fooswichable .. But I have a question .. inside, next to the output tranny is a pot for the "Control bias mod" Someone can explain what is? Thanks