For those who are interested in using D1 Plus as an Amp, I just found out that, although the direct button from the old D1 has dissapeared, you can use the volume knob for Line out and Tube Preamp Out by changing moving 2 jumpers (possible noise interferences though) : http://aginghippy.org/general/maverick-audio-tubemagic-d1-plus/#.UyFVa-2BnW4