Personally, I would just buy a used ARC Ref 75SE, as it would probably cost you less money, and most of the components would be newer.
Recently, I just bought a ARC Ref 5SE and sold my ARC Ref 5.
ARC quoted me $3500 to upgrade the Ref 5 to a Ref 5SE.
By doing it my way, I saved over $2,000.
And while the new SE pack of capacitors is older doing it this way, the other 80% of the parts of the 5SE I bought were a couple of years newer than the parts in the Ref 5.
