IMO it is indeed worth extra money to do the upgrade. The Ref3 is a truly remarkable preamp. You won't be disappointed. It will help breathe new life into those big Maggies and your wonderful system.
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I concur with Doc on Ref 3 being a wonderful linestage. However, if you are a lover of 'bloom', the Ref 3 may not be necessarily the device for you. Overall, it is more linear, tighter, and somewhat less bloomy than many tube line stages on the market. . . . I am thinking in particular of the BAT VK51SE. Rather, Ref 3 seems to be a device that bridges some of the more desirable characteristics of tubes and solid state.