Quizás el cambio semi obligatorio de tubos no fue tan positivo...
https://positive-feedback.com/high-fidelity/leben-cs600x-integrated-amplifier/
But there is something else—best integrated amplifiers integrated in this price range, but solid-state ones, say Accuphase and Luxman, have a slightly better shaped sound structure. They better select events and organize them, even though their sound is not as refined and smooth as with Leben. But when it comes to bass, besides a slightly, but only slightly, better control in the lowest range, these solid-state devices are not able to outperform Leben. Wow!