The Rogue is far superior to the Adcom pieces. If you decide to keeo the amp a tube preamp (Quicksilver, Audio Mirror, etc.) will help tame the Adcom.
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Pair the GFA-555 with anything but an Adcom preamp. One would think there is some synergy between Adcom components but I found that is not exactly true a few years ago. You want to make the GFA-555 really sing, pair it with an ARC preamp (the LS series LS-1 or LS-2), you will be very surprised at the results.
Reed, the best thing I ever did in the world of audio was ditch my Adcom power and pre amps. In the years I had them I hardly if ever sat down and did dedicated listening, it was always as music in the bakground. When I had the $$ to do something about it I did. With my new amp and pre, I hardly ever DON'T sit down and listen intently.
Readthis, the ARC preamps I suggested will make the GFA-555 more transparent and closer to three dimensional. Will also extend the treble but it will be more refined (alot less noticable grain) & pull more detail from your recordings. Either the LS-1 or LS-2 are relatively inexpensive compared to other ARC preamps and are hybrid. They use only one triode tube with mosfet followers & are not considered to be very warm sounding but lean more towards accuracy. This suggestion is based on the idea you intend on keeping the GFA-555 to save a few dollars as there are better amps like the McCormacks.