I can't vouch for Krell-like sound, but if he wants a good ss amp that's quite a bit lighter for $800, I would consider McCormack DNA 0.5, or 1.0.
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Man, that's a tall order. The Krell KSA 80 (and much better yet, the KMA 160's) are amongst my all time favorite amps. I think I understand the circumstances, but, if friends and family really don't mind moving it, let the poor guy enjoy it. After losing his health, he really doesn't need to loose a classic like that too. Beg him to keep it.
I have had an Aragon 8008BB for many years driving my not too efficient (and full range) Mirage M3si. If the bass gets to the amp, and you provide it enough juice (no crappy AC filters), the bass will certainly come out. And it will be extended, but more importantly, well controlled. However, there are aspects to the 8008 that should be identified, based on the original post.
Either model of the Aragon 8008 weighs a lot more than 40 LBS. I beleieve the ST comes in at around 65LBS, while the BB is around 75 LBS (extra transformer). In addition, and depending on speaker, I did not find the Aragon's sound quite the same as some Krell amps. As an example, driving a pair of Thiel 3.6 or 7's, the Aragon definitley added some grain and an electronic edge to piano compared to an FPB 200. In fact, it was quite bad on the 7's. I cannot say what the Krell 80B sounded like to me as I never heard it.
The sonic differences, while still there, were less audible on other speakers such as Wilson or the Mirage. I could not afford the Krell, so bought the Aragon. It served me well for many years. Properly matched and setup, it has been musical, detailed, and sounded pretty good most of the time. I enjoyed rock, blues, jazz, etc., with this in my system, and it boogied pretty darned well.
Other than the weight, I do not know that you can get one in good condition for $800.00.
I beleive the McCormacks will have better bass than the Aragons although both are very good amps in their own way. I know one reviewer compared the DNA-1 very favorably to a Krell amp but admittingly gave the Krell amp the final nod for having state of the art bass. The McCormacks presentation is more forward sounding where as the Aragons sound is more layed back but both portray a very large soundstage. You know it just comes down to what characteristics are most important to you. I could easily recommend either one.
Regarding the Krell 300i integrated amp, in my opinion this does NOT have the famous Krell sound and is really a mediocre amp/integrated amp. The 400 is a step up in performance though, but still a lot to be desired.
Since weight is such an important factor I doubt you will be able to replace the Krell sound of their older amps. The FPB and previous amps had great smooth sound, great bass and were actually quite airy in the mids and highs. Many people today seem to claim the Krells as being bright and edgy (which may have some truth with some of their newer stuff, especially the audio/video/home theatre stuff)but the amps of a slightly older nature are in no way producing this type of sound. I love the FPB series and while they are capable of carrying a highly detailed signal, they do not add glare and graininess (unless it is part of the signal it is being fed, which of course any good amp should do - vs. stomping on the signal by smoothing it out).
If I liked the sound of the digital/switching type amps, then I would recommend these based on weight alone (part of your requisite); however, I have yet to hear a digital amp that I could ever be happy with (please no bashing here, I have not heard them all).
Several years ago I switched from a KSA 50s that I really liked to Odyssey Monos because I needed more output. The character of The Monos was very, very close to the Krell. Neither amp was remotely hard or edgy and my guess is, if you like Krell you'll like Odyssey. More power and fewer $ are the bonus here.
from Don Shaulis review in January issue of Stereo Times:
"I have never heard Moussorgsky: Night on Bald Mountain/Pictures at an Exhibition [Telarc B000003CSH] before. Oh, I have owned the CD for years but I never really heard it before. The Spectron presented the softer passages with such inner detail they became seductive but the real surprise came in the crescendos. The peaks reached were a revelation. It wasnt that the Spectron could play loud, it was that I wanted the music louder. For the first time the crescendos were reproduced with full fury but no smearing or harsh edge that demanded the volume be reduced. Now, after many years, I finally get this fine recording. "
Well, with "pulerising power" (Neil Gader of TAS) of 2500 watts peak power over 500 msec and ultralow distortions AND low weight of 52 lbs - your clear cut solution is
Spectron Audio Musician III SE
All The Best