I own a ARC Ref 3; it is a fabulous differentially balanced linestage, with loads of finesse, micro and macrodynamics; I suspect it will match very well to your Halcro. . I am also exceedingly partial to amps manufactured by Jeff Rowland Design (JRDG) like the Concerto. I have heard it matched to several Rowland power amps--which like yours are class D switching amps--and the results are supremely musical. . . . and yes, Rowland preamps are all completely balanced designs.
Balanced outputs vs balanced design
Friends, I am looking for a balanced tube pre to mate with Halcro MC20. I have since learned that there are single ended designs with balanced outputs and fully balanced designs, like the BAT's. In a response to a thread below the author suggests that the "magic" happens in the amp and that the pre does not have to be fully balanced to benefit from the noise reduction qualitites. If so, is thre any inherent advantage to a fully balanced preanp? And more particularly for my purposes which would not run connects more than 10' from the amp. If there is no great advantage to a fully balanced pre, I can widen my search. As always, tell me about your favorite tube pres to run with this SS amp. Many thanks.