Tube Pre for Digital Amp


I have a Carver Pro Class "t" digital amp and am wondering if anyone out there is using tubes in front, for their Bel Canto, HCA-2, Spectron amps? thanks...
dmason
Agree with the estimable Mr. Rubinson. My tubed SF Line 3 and bridged eVo2's make beautiful music together.
Audible Illusions 3 pre-amp with PS Audio HCA-2 amp has displaced my Threshold amp.
Rockhead uses a Suprtek Syrah with his Spectron... I think he really likes that combo.