Got really curious, search and found this review but I am sure the OP has read it already. My initial comment was purely based on the Krell name but after seeing the measurements, I see no need to edit my original comment. The rest of the reviews to me are, like most others just blurbs, bla bla bla, no such thing as bad reviews ofter all.
Krell KSA-200S power amplifier Measurements | Stereophile.com
I guessed right about the relatively higher THD, but class A bias for 8 ohm load, plus low feed back design I don't mind that at all.
Yes it is old, but if preserved well, I still would prefer it to the Mc 252 for sure. Measured figures were impressive, 280 WPC, double down to 1600WPC (1 chanel driven) base on the 200 WPC 8 ohm rating (See even Krell played the double game a little but wouldn't call it cheating..). Transformer was rated for 2800 VA, that's more than double that of the so call 5X200W XPA-5 and has 68,000 uf per channel if I read it correctly, no wonder Sterophile referred to them as reservoir caps (vs filter..).