First the integrated amp. The KA-6100 features 50 watts per channel and a THD of .03%. Twin power meters and dual power supplies. A nice amp! I used it for a few months and sold it. This is a great example of a quality amp that isn't super popular, so it's available for under $50.
The KT-6500 Tuner is as good a tuner as I've ever used. It is wonderful. Pulls stations in so clearly! I actually didn't even hook up the antenna for a week after I picked it up. I'm not kidding. It's a great tuner.