I am interested in understanding some facts about these older tube preamps....compared to tube preamps made in the 80's and 90's from ARC, CJ, Quicksilver, etc how does the sound of the older tube Macintosh preamps compare, assuming the units are functioning up to spec? Were tube preamps in the 60's designed and engineered significantly different than preamps in the 80's and 90's? Were engineering and design improvements made in the 80's and 90's to the point of noticeable sound improvement?

Thank you.

Ruben

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