I have some Vintage Krells (3). 2 of them have been recapped and serviced (KSA-200s - KST-100) I also have a KSA-250 that I have not yet gotten recapped but was checked for running operation when I bought it at a service center. These amps are the best for me with my Martin Logan ESLs and Montis. My take is that the Class A and power reserves, output transistors from them just is superior to other amps I’ve tried.
Currently I’m in love with my KSA-200s in my system. I have to say that the bias technology in the KSA-200s runs very cool, at full power or idling. I can say that the KSA-200s is one of the best out there, and the KSA-300s is even better if you have the speakers than can handle the extra power. I may some day get one of the KSA-300s for my collection. The KST-100 and the KSA-250 are the generation before the adjustable bias on the KSA-200s. They run very hot, and can heat up a room without AC. Oh, the sound though. I bought a recapped Mark Levinson No.331 and sold it and got another Krell. Mark didn’t really gel with the Martin Logans. Shame. It was the most beautiful amp I had ever seen. KSA-200s is supposed to be the most musical of all the Vintage Krells (KSA-300s too).
Currently I’m in love with my KSA-200s in my system. I have to say that the bias technology in the KSA-200s runs very cool, at full power or idling. I can say that the KSA-200s is one of the best out there, and the KSA-300s is even better if you have the speakers than can handle the extra power. I may some day get one of the KSA-300s for my collection. The KST-100 and the KSA-250 are the generation before the adjustable bias on the KSA-200s. They run very hot, and can heat up a room without AC. Oh, the sound though. I bought a recapped Mark Levinson No.331 and sold it and got another Krell. Mark didn’t really gel with the Martin Logans. Shame. It was the most beautiful amp I had ever seen. KSA-200s is supposed to be the most musical of all the Vintage Krells (KSA-300s too).