Odyssey makes some fine solid state amps in your price range. You may want to check them out.
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For 13 years, I had an ADCOM GFA 545 power amp paired with an ADCOM GTP 500 II preamp/tuner and decided to replaced the set-up when the power relay started to go on the preamp. I first introduced a vintage Marantz receiver into the mix just to use its preamp and the overall sound was noticeably more musical than it ever had been. From there, I purchased a Musical Fidelity A3 integrated amp and once again, I noticed and liked the differences almost immediately ... I felt like the MF was much more elegant and refined sounding than the ADCOM set-up had ever been. I walked away with the belief that what held back the ADCOM combo, was the ADCOM preamp.
I say all that to ask are you really dissatisfied with the power amp, because I would look to replace the preamp first or even consider going with an integrated, as they have improved that much over the years. I like the Musical Fidelity line, so a preamp like the MF A 3 or A3.2 would be nice. Upscale Audio has some new ones in your price range. Today I use a MF CDPRE 24 (A3.3 preamp/cd combo) with a Prima Luna tube power amp. Can not say enough good things about the sound.
If you are picking up Revel Concerta M12 speakers I would not go for Odyssey or Musical Fidelity. I still have a Adcom 545 in my home studio. I have owned the Odyssey and my bro-in-law owns MF stuff. Both of these will be too bright for those speakers, although they are both excellent amps, but not for your setup. I would get a warmer sounding amp like a used CJ MF series, The McCormack stuff, Classe, even the newer Adcom 5802 will sound much better and warmer. All of this stuff can be found used under $1K. Any of these amps will be a BIG leap over the Adcom 555MkII (and my Dad owned that one)!
Not to sound like a saleman, I will be selling my CJ MF-200 soon on Audiogon, and that would work for you also.
I've owned a number of amps. The two for under 2K that I'd recommend to anyone are the Audio Research 100.2, for around $1650 used, and the Classe CA-101, around $850 used. They're both robust 100 W/channel solid-state stereo amps with clean, engaging sound. More money does not, I've discovered the hard way, necessarily mean better sound. Classe's 101 is just a much better amp in most ways than their larger and 3-times-more-expensive 301.
And the ARC is almost the best I've ever owned. It bettered my old Classe Delta CA-2200 in many ways, though the Classe amp was a bit more evenly-balanced.
If you see a Forte 4a, that's a fantastic little amp and a steal at anywhere under $650. You could pay multiples more and not equal the sound of a 4a.
One I've not heard but about which sonnets have been written is the Pass Aleph 3. Maybe worth a listen.
Another option is to modify your existing Adcom. www.musicaldesign.com does just this. I have had a modified original 555 Adcom in my system going on 20 years now and trust me it does not sound like the stock unit. For under a grand it would be brought to a new level of performance. In fact I'm thinking of sending mine in for the Blackgate caps everyone is singing praises about. If you do modify you always want to go with the top level mods because you will sit there listening to music going wonder what it would have sounded like if I had the Blackgates or schotsky diodes put in it.
Trust your ears...
Well put Qdrone, it may be interesting to note that I lived with with the GFA-555 MKII longer than any other power amp since. Everyone that heard it liked it a great deal. At the time I thought this amp was the best, regardless of price. Only when I started to upgrade did I realize that the 555 MKII lacked in refinements and a large 3D soundstage. (This equation could be improved upon with the addition of a good tube preamp). It will always be a part of my past where I enjoyed listening to my music a great deal. I agree that this power amp could benefit tremendously from upgrades. Anyhow, jgreene is correct in regards to the ARC 100.2, a superp amplifier!
Wow! Thanks for all the responses! I certainly do have a lot of choices to ponder now. Please keep the ideas coming. In answer to Rich, I am pretty satisfied with my pre-amp; it was a big upgrade in sound than the GTP-500 II that preceeded it. In fact, that improvement has now given me the upgrade bug for the amp. Also, thanks so much for the reference for the M12 review, I've been searching for one!
On another note, I know I said I wanted to stick to solid-state, but I got offered a Audio Research D-76 recently, and I wondered what the thoughts are on that amp, since I can find precious little online.