This little headphone amp is as cute as a puppy!

Oh man I love my MT-604. I like it better than my Asgard 3. I find the stock tubes just fine. The GE Jan 5654w tubes are not necessarily better--just different. I'm using an upgraded power supply from iFi Audio: 12V Power-X. The 604 is a wonderful amp with my Edition XX cans..

can i use my jotunheim 2 with the dac added to it as a input for it, i ordered some hart audio cables to use for it.

Yes, you should be able to use the pre-out XLRs on the Jot2 to feed the MT604