I know there are some threads that discuss this and I have been perusing them as well as other forums via Google BUT, I thought I'd throw out a line and see if anybody has some recommendations for a fairly inexpensive headphone amp for a pair of Sennheiser HD650's. I'm going to directly connect it to my Oppo 195 either coax or RCA out. I really want to make these sound warm and most fingers point to a Schiit tube amp like the Valhalla or the Lyr. I did read that the stock tubes in those were crap by one persons findings. There's all these pluses and minuses and damnit, I just wanna drive these headphones right! I figure the DAC in the Oppo itself is probably fine. If you think otherwise please say so. I think they just need a good amp! The headphone out jack on the Oppo 195 itself is just OK and I wanna pull everything out of these things. Any and all input is greatly appreciated.