Jadis amplifiers: rolled off treble?

Hi folks (and Jadis aficionados out there), tell me the truth please: do Jadis amplifiers have rolled off treble? Each time I'm listening to one I have this impression. The sound might be glorious (like all Jadis) but... doesn't it sound darker than in real life? Because of this presumed rolled off treble some CD's sound better and overall music sound more pleasant, more like... Jadis.

Chris