Hi guys, my first post in this thread, although I have looked in a few times. Yesterday I got some NewclassD Dexas for my Minimax Tube DAC Plus. (they are not Class D opamps, if anything they sound more analogue, thats their company name unfortunately lol) http://www.hificollective.co.uk/components/newclassdopamps.html http://www.newclassd.com/index.php?page=55 I had to get both single and dual sets as my DAC needs both when not using the tube, so not cheap. They arent burned in yet, so these are preliminary results. Immediately I noticed that when music is playing everything is better defined/crisper and the background is darker (for want of a better word). Bass takes on new detail, each vibration can be better felt. There is a lot of extra tiny detail that I didnt know existed. Like something brushing a string, the extra twang from a plucked string, the full extended ring of a cymbal strike, tiny effects/noises/accidents that werent resolvable before - even when there is lots of other sound going on. The effect is quite subtle but very noticeable if you know well what you are listening to (bearing in mind this DAC was already extremely revealing so its not easy to get more from it!) A new level of detail is brought to life. The sound is slightly bright but they arent run in yet. Since last week I'm also messing with some MOX resistors in my crossovers which are very revealing and brighter sounding, almost got the balance nailed. These opamps are great so far, I'll wait about a week to see how everything beds in before fiddling further with the crossovers. This is a good write up (by someone else) on many different Opamps tested on my DAC, you can get a good idea if any of these will be suitable for your own kit/soundcard. http://www.enjoythemusic.com/magazine/equipment/1212/eastern_electric_minimax_dac_plus.htm If you fancy trying them on your soundcard, DAC or CD player, the Dexas replace the following... Single: NE5534 (as in my DAC), AD711, OPA604, OPA627 and others Dual: NE5532 (as in my DAC), AD712, OPA 2604 and others edit: After the run in period, my hifi sounded cheap and nasty. Bass was like a disco and while the detail was there, everything sounded the same volume level, as though it was compressed, all the finesse disappeared. Swapping in/out the old opamps, the Dual Dexa opamps are overloading my DAC, as soon as they are in the system the sound is loud and compressed with no finesse. Luckily the guy at Hificollective has let me return them without issue, thanks dude if you are reading this. So my kit is now running with the single Dexa opamps and the original duals, it sounds great. Lots of extra detail with all the finesse, just these are a worthy upgrade, saved me £93 as well lol.