I have had YBA in my system for last 20+ years, got them because they have sound of tube with benefits of SS. Remember that older units were made in France, Refinement and Passion series are made in China. Prof. Andre has, to my knowledge, distanced himself from Chinese company, but not sure. So, if you find unit made in France, grab it. Rarely seen on AGon. Best part is, they are incredibly efficient. After playing for hours, the heat sinks barely get lukewarm. They need to be left on all the time for heat stability and consume only 6 watts in idle state. The Signature series is interesting in that, each component is hand tested by the professor, auditioned and signed by him.
YBA PRODUCTS
I just purchased their PASSION 650 stereo amp. Some of the sweetest solid-state Watts I have heard; this is after letting go of my BEL CANTO 40 SET AMP. Given how wonderful YBA products are I am wondering why I’ve heard of them only once or twice in the last dozen years or so, and I think both times have been me. Anyone out there have first hand listening experience with YBA?