just a quick update, the very first unit which came to my house was not performing at its best due to my IC cables, I used rca from s7i to the k10 and xlr from the k10 to my karan 2000, so the switch was not in balance mode, so that might affect the overall performance on the day. Now everything is fully balanced from in to out so thats the reason why I hear it sounds completely different from the first time, and very very similar to the einstein which has 19 carefully selected NOS tubes. The Paganini I'm playing while typing these words are great, very very real and musical.