As between the two amps you mention,the KSA is a superior amp by far--my recollection is that the KST was the inexpensive Claa AB amp they came out with to be more user friendly, but not in the same league as their KSA Class A biased amps. The KSA was a fine amp, but was criticised as a bit "cold" and "hi-fi" in some ways, not as sweet or musical as its little KSA 50 brother; its prime asset is that it can drive virtually any speaker made. The newer Krells will sound closer to your valve amplifiers and are probably a better bet. If you do still want the KSA, keep in mind that the unit will probably need some new capacitors (it's 20 years old), and the fan that cools it is prone to breakdowns (one reason their next model, the KSA 80/200, had huge heat sinks to replace the fan). It also will double as a space heater--it throws off a lot of heat, though you're probably used to that with your Mcs.
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