Assuming they've got BIG heatsinks on the sides, they are the monobloc versions of the old KSA 200 amplifier, which Krell came out with between their KMA 100/200 fan-cooled amps and the MDA 300/500 and KSA 150/250 amps. First came out with that generation in 1989 or so, I think (I bought one of the first KSA 80s to drive my Duntechs, and I think I got those speakers near the end of 1987). If they don't have balanced inputs, it's probably an early version of the amps, as Krell started adding the balanced inputs later in the series (at least with the stereo amps). These amps are powerhouses, and can drive almost anything out there. My recollection was that I liked the MDA 300s a little better as being sweeter in the highs, but that the KSA 80 was still a pretty good amp, particularly after you left it on for a while. Great space heaters too, as I recall the amps run Class A up to their full power output, unlike later Krells.
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