I have not heard the ARC, but know them to be well made. I don't think you will have any problems. Perhaps contacting ARC to see if they recommend updating. Again, I don't know how old the amp is, but I do know that capacitors don't last forever. (Though my poor old Adcom 555 is still functioning after 24+ years).YMMV
Bob
And, I am envious. I would love to have a pair of Quatro CT's.
Bob
And, I am envious. I would love to have a pair of Quatro CT's.