My DV 336SE is strange. After it gets hot (20-30 mins) it causes my lungs and throat to get sore. I know it sounds funny, but it isn't as it must be evaporating something that irritates my breathing (based on my research I guess it might be epoxy resin). I have a question - did anybody else encounter this problem? Did it stop after a while (once something inside burns out)? I've had DV for 5 months, but have used it max. 50 hrs so far due to this issue. I guess I'll have to sell it since it's too risky for me with this behavior so my second question is - what is the alternative for DV? I really like its sound and the way it drives my HD600 and DT770 with a bit of warmth so I'd like to get some amp with similar sound, but maybe more predictable components used inside I've heard about Bottlehead Crack, but am a little bit worried that building it may be too hard and it will have the same issue as DV in the end. What are the recommended options for HD600? I've been also thinking about JDS Labs Atom, Schiit Valhalla and Feliks Audio Echo (I'm in Poland, so it should be the easiest buy, othere require international shipping). Thanks!