Quote:   Scroll down to Mad Lust Envy's 3 posts on the following page to read his impressions of listening to DT990 and K701 with the E9...   http://www.head-fi.org/forum/thread/518997/fiio-e9-pre-release-unboxing-review-part-1/60  

Does this mean that Fiio are working on a tube based amp or did you mean tube amps in general?   Quote: