I should like to hear from Sennheiser fans only how the 660s compares to the 650. So please, people who does not like the Sennheiser sound, don't comment.

I received a PM from Fang at Head-Direct asking me if I would like to review his new headphone amp. Which of course I said yes to – I was actually very enthusiastic about this opportunity since I was intrigued to see what I would think of a hybrid amp, given my predilection for tube amps...

Today I received my EF1 from Head-Direct. I had first heard the amp at CanJam2008, and was quite impressed with the prototype. The amp is a hybrid that utilizes a single 12AU7 tube. Although I have only accumulated about 3 hours listening time, I did try most of my phones and a variety...

Review of the Head-Direct EF1 Do note that this is my first review in Head-fi, originally posted in Jaben Forums here: Head Direct EF1 [Review] I've been lusting for my very own tube amplifier after hearing other people's, like the Yamamoto HA-02 and the Little Dot MKIV SE. After much...

It has been some time now since I posted my initial impressions of this new hybrid amplifier from Head-Direct. After considerable listening, and changing opamps to try to best match with the cleartop RCA tube, I have come to the conclusion that this is one of the best-sounding amps that I...