@atanarjuat99 Congrats on the Hegel purchase. I'd love to hear how things are after you have everything set up and have listened for a while. The difference in the 190 & 390 is really interesting, I'll have to check that out at my local Hegel dealer next time I wander in.
Not sure what you decided to do with the Headphones end of this, but if you are looking for a stand-alone headphone amp, my favorite (by far) for not a huge outlay is the Linear Tube Audio MZ2. If you were drawn to the tone of the H390 over the H190, I'm guessing the MZ2 will make many other headphone amps sound broken.
https://www.lineartubeaudio.com/products/mz2mz2-s
Not sure what you decided to do with the Headphones end of this, but if you are looking for a stand-alone headphone amp, my favorite (by far) for not a huge outlay is the Linear Tube Audio MZ2. If you were drawn to the tone of the H390 over the H190, I'm guessing the MZ2 will make many other headphone amps sound broken.
https://www.lineartubeaudio.com/products/mz2mz2-s