I've never heard the Kel48, so I can't help with a comparison. But I own an Audio Note Kit 2 and a Stoetkit Jr. I like them both very much. The Stoetkit is very controlled and neutral but at the same time rich sounding. If I had to describe it in non-technical terms, I'd say it had much of the midrange warmth of a SET amp with the bass control of a PP. I really like it a lot.FSAudio is a dealer for the Stoetkit, and they used to be a sponsor of ART. They aren't sponsors anymore, but ART still archives the posts (by permission). Here are some posts I made in the FSAudio forum about the Stoetkit: