Can be bought ready built (USD279) or cheaper as a kit. Tube is 6n23p "Reflektor". ---- Comments answered: - Thanks for the 5751 tube information. Ordered some tubes, including a 5751 - I still prefer the other amps for the Audezes, but not for HE-500. Love the soundstage, vocals and details the combo provides

After several months, I used both the V200 and Burson HA-160D. I find that they both are excellent amps to e.g. K702, LCD-2, HE-300 and HE-500. Last week I decided that the 160D had to go, since I always reverted to the V200 for all these headphones. There is something likeable with the V200 sound signature and build quality.   The project86 and WA reviews elaborate further.

  1) HE-500 sounds darker and smoother than the HE-300. Not the other way around. IMHO. 2) HE-300 articulates better than HE-500 and for some, the HE-300 will feel like fresh air / an opened window to the music compared with the HE-500 3) HE-300 has a bass impact the excels the K70x. They are worlds apart. Generally the K702 is perceived tuned quite brighter through the whole spectrum than the HE-300 4) HE-300 and the HE-500 have both good comfort, the former is best for those appreciating it's net weight and the latter for those finding...