aeberbach - My knowledge of the technical aspects of amps is nil. Therefore, I don't know whether the AQ-100DT is a push-pull amp. For more info I suggest that Divergent Tech be contacted at email@example.com
(519-749-1565). This amp was recommended for the K1000 by the folks at HeadRoom Corp., and they also suggested that I connect the K1000 to the 16 ohm speaker terminals of the ASL amp. As for selecting the TJ meshplate tubes, it was on the basis of lots of reviews. These tubes were rated second only to the Western Electric 300Bs, but these cost about $700 per pair. Since this was more than I was prepared to spend, I bought the second best TJs, which I think cost between $300 - $400 a pair (my invoice shows L 2,730 in Hong Kong currency). I have not heard the Western Electric tubes, but I can't imagine the K1000s (or any other headphone) sounding singnificanly better.
andrzejpw - As I previously explained, the shrill sound of the K1000 changed to a wonderful deep, broad, and full sound when I connected the K1000 to my ASL AQ1005DT amp. As for needing a subwoofer, It's no longer necessary since I switched to TJ meshplate tubes. The base produced by the K1000 is now beutifully deep and detailed.