I have the MC275 mk V and the best thing one can do is swap out the stock tubes as these are what are mainly contributing to the soft detail/focus/seperation you have heard.
With judicious tube rolling, this amp combined with my Nola Viper 1X's and a dual REL sub setup totally rock the house at any sane/clean level one would ever desire.
With judicious tube rolling, this amp combined with my Nola Viper 1X's and a dual REL sub setup totally rock the house at any sane/clean level one would ever desire.