This amp delivers, with enough power to handle my demanding headphones.

Power Tubes: Sovtek 6H30EBpi Super tubes with chrome pins are by far the best power tubes to use and will cost you about $70 for a matched pair

I chose to stay in the EF95 family to start (the default jumper setting), and picked up some better power tubes (though I haven’t used them yet) and a couple sets of driver tubes (the smaller ones in front that really affect the sound).

One of the four tube was not working correctly, so I was not getting the power I needed to hear it

It has enough power to drive these well.

Update 09-14-2017I installed the Super Power TubesSovtek 6H30Pi Cryo and Matched Pair and achieved a bit more output power and the sound is even more crisp sounding

I might come back and edit this review when i receive the better power tubes (larger tubes), it suppose to yield a bit of more output power

I replaced the cheaply made LDMK cord with a much more robust $10 Hospital Grade Power Cord and the problem was instantly fixed

I traded out the power tubes, as well, but the difference wasn't quite as obvious