"Good tube Integrated Amps"

I am thoroughly enjoying my Jolida 3502, which can be had for less than half of your budget of $4000. It is versatile, dynamic, and sounds great.

You might also check out the PrimaLuna line, which a lot of people like.

Cary SLI-80 F1 edition.  Versatile and very musical. Readily available on the used market.  Has passed the test of time and manufacture and supported here in the USA.

Here ya go ! Made in USA for $2500.
http://www.rogueaudio.com/Products_Cronus_Magnum.htm