Suggestion used tube amp between $1,500-2,000

With my low budget I would love anyone suggestion to pick a nice tube amp to match my equipments.  I am really love the warm sound of vocal, mostly will listen to vocal.  Will be use with Audio Research LS7 pre, Schist Gungnir DAC, Sonus Faber Venere 2.5.  

Thank you,
Eddy