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there is no internal difference in the design of the power amp side of these 2 apart from slightly better transistors in the 1062 vertually the same sound though - its just got more power in the 1070- same as the 1090- just double again.- the 1062 has a very good pre-amp built in though-and so is the bargain of them imho- i am selling one at the mo though-so slightly biased? the pre amp stage of the 62 series is a improvement over the 70 series pre's as its a vastly upgraded alps potentiometer -(the main part of a pre)