Tube Line Stage around $5k

Thanks but nothing against PL, in fact I auditioned my speakers on a PL amp, but I am only interested in Made in USA.    

In that case your myopia prevents you from looking at Nagra, Wavac, Kondo and Audionote

A little over budget .... but superb at the price

+1 Herron Audio.

Like the VTPH-2a, the Herron Reference 360 is destined to become a legacy component, one that will provide years of trouble-free, unimpeachable performance. A little above your price point but very much worth the stretch, it will hold its monetary value and remain at the edge of the performance envelope for a long time to come. Of course, all IMHO and from a Herron fanboy.