The new models are almost entirely based on the classic models from their heyday, except with upgraded wiring and circuitry to meet current safety standards, etc. Also upgraded circuit boards. Still, the new models have improved specs in some areas, so it's obvious that some engineers are tweaking them, but Adcom only ever refers to their team of engineers. No names are mentioned.
Earlier I may have given the impression that tubes are less than ideal in my opinion, but it's obvious that many love the sound and options of tube rolling. I'm sure the tube sound would compliment Adcom amps, if one rolls that way!
I've got 30 hours on the 555SE at this point, and I've been changing cables and speakers as I go so it's hard to notice if the amp is improving. But I'll tell you this, Ascend Sierra 2 speakers do not like Wireworld Oasis 7 speaker cables. Strangest thing I've ever seen in my system. A muted somewhat non-dynamic sound is the result, but swap in the Tress cables and everything missing is back. The Totem Rainmakers are fine with either cable but do sound better with the Tress as well.
All in all though, the amp sound quality is quite good. Open, fine imaging, air around the instruments without grain. It's obvious why this design put Adcom on the map back in the day. I don't crank it up in my smaller room, though, peaks of around 82-84 db are enough for me. There's an old review by Stereophile floating around regarding the original 555 in which much praise is offered, and favorable comparisons with the high end gear of the day. I'd say it's worth reading.
In this hobby I've made some missteps, and it's my hope to leave my impressions and results here to help others like myself who are looking for good options. IMHO, these Adcom amps are a worthy contender unless you're looking to achieve that last 3-4% of magic in your system. In that case, a reputable dealer with experienced staff may be your best bet, along with a much higher budget.
Earlier I may have given the impression that tubes are less than ideal in my opinion, but it's obvious that many love the sound and options of tube rolling. I'm sure the tube sound would compliment Adcom amps, if one rolls that way!
I've got 30 hours on the 555SE at this point, and I've been changing cables and speakers as I go so it's hard to notice if the amp is improving. But I'll tell you this, Ascend Sierra 2 speakers do not like Wireworld Oasis 7 speaker cables. Strangest thing I've ever seen in my system. A muted somewhat non-dynamic sound is the result, but swap in the Tress cables and everything missing is back. The Totem Rainmakers are fine with either cable but do sound better with the Tress as well.
All in all though, the amp sound quality is quite good. Open, fine imaging, air around the instruments without grain. It's obvious why this design put Adcom on the map back in the day. I don't crank it up in my smaller room, though, peaks of around 82-84 db are enough for me. There's an old review by Stereophile floating around regarding the original 555 in which much praise is offered, and favorable comparisons with the high end gear of the day. I'd say it's worth reading.
In this hobby I've made some missteps, and it's my hope to leave my impressions and results here to help others like myself who are looking for good options. IMHO, these Adcom amps are a worthy contender unless you're looking to achieve that last 3-4% of magic in your system. In that case, a reputable dealer with experienced staff may be your best bet, along with a much higher budget.