Phono Preamp Tube Rush

I HAVE A ROGUE AUDIO 99 WITH PHONO STAGE.AT 12 olock I get a low level hiss.Can only hear it with no music on,between tracks and during quiet passages.Rogue rep. told me to get quieter tubes@$15 each.Is tube rush normal.I spent big bucks for this preamp.Am I over reacting. Thanks all!