Second harmonics distortion?

Hi folks, recently I listened to a system consisting of Jadis DA88S amplifier and top of the line Sonus Faber loudspeakers. During a counter tenor part I heard some distortion that reminds me of slightly overdriven guitar amplifier (quite euphonic sounding distortion). Was this in fact second harmonics distortion? I thought Jadis was a tube amplifier manufacturer that eschews the typical tube sound, or am I wrong?

Chris