These manufacturers are trying to build these things like toasters, someone designs it here, emails it there, it gets built in China or in some other part of the world, and there is no connection between the people involved. 

They are recycling old designs, they've taken Marshalls, Voxs, Fenders, whatever, and tried to copy them. But no matter how good these original amps sounded, they were built in an era of fierce competition and they inevitably contained mistakes. So these new guys are making the same mistakes all over again! www.bluesinlondon.com