Krell KSA100 vs Threshold 400A vs McCormack DNA 0.5

McCormack amps are excellent, not expensive, and have many upgrade iterations.  It would behoove you to give Steve a call before you purchase anything else.  

I can get the Krell for $1200.  Power supply caps were already changed.  It is mint.

Seems like a typical price for KSA 100 (gen 1) is about $800-900 used.  Figure $300-400 for the main power supply caps plus labor, so $1200 is probably a good price.

I really like McCormack....  I have owned two and regret selling them.   The KSA100 was one of the best sounding amps of its time .   I would buy a clean one without hesitation 

If all you need is a 100 watt amp look and read up on an Audio Research 100.2. Great sounding amp that has a cult following for good reason. I owned one and if you want something close to a tube amp it’ll get you in the ballpark a little. Don’t worry about caps as some throw out all older amps need recapped... I’ve owned several older amps and know a lot of people with them and no issues except ML 300 series amps which just had bad caps to begin with; a lot older ML amps running just fine.

My experience I’d take a McCormack over the older Aragon amps. The 4004 was a amp with plenty of control but I always felt that attribute brought too much attention to it. I feel the McCormacks even stock were a little more balanced and played well with many types of music where the Aragon (only experience with the 4004 series I and II) definitely a better Rock amp. I’m not sure I’d throw a 4004 in with SS amps that get close to tubes amps though.

Krell KSA 100 is a Class A amp up to 100 watts that is a nice amp. Audio Video Logic had one for sale on here that the add expired on that I know they still have. I still think I’d take the ARC 100.2 over any amps noted so far... I preferred it with its balance inputs but sounded just fine with the single ended as well. Great amp.