looking for a Integrated amp $6,000 range

Luxman. On the used market. You can save a bundle. I own the L-507uX MK2. Wonderful amp. Customer service is outstanding. 

Not sure if your preference is for SS or Valves but I can certainly recommend a used or discounted Ayon Triton III with its 8x KT150’s and Triode/Pentode options.

Amazing tech and build quality, maybe check the manual out online for an insight.

I’ve used it with Harbeths, Escalante Fremont Mk2 and Tannoy Arden Legacy’s.

Ayon Triton III does the business, try and hear one or if taking a risk, it’s minimal taking account of its quality although I imagine a few of the suggestions here fall into that category.

Remind me what your speakers are?

Lots of great choices here.  I love my Mimas.   
Good luck.  

The speakers I’m using are the
 Legacy Focus 20/20 late 90s version 

Hegel is a really top grade amp, comes with a DAC, which is audiophile grade, and the headphone amp is in many models, the amp output. Plenty of analog and digital inputs. I own both the h190 and h590 in my two systems. Playing into the Dynaudio evoke 50 the h190 and the monitor audio gold 300 5G, the h590. Outstanding value...