So my reason for not really expressing any thoughts of satisfaction with the AF was because I didn't want to judge it with the stock driver tube. Also, my Atticus balanced cable stopped working and my 650 is not fixed yet. I have just been using my Modded T50RP which is really also not the best headphone for it, even if the AF is a good amp for that headphone. So unfortunately I am not able to make the best of it yet. And I need to re-up on headphones. BUT... Last night I got a cheap raytheon 25C1 tube that I only payed 4 bucks plus shipping for. Not saying that that is even a good tube but compared to the driver tube it shipped with the differences are exactly what I wanted which was that last bit of clarity that the Pro iCan was besting it in. In fact this might even be more transparent with my T50 mod and the AF opens it up. That stock tube (no shocker) really sucks so I am just posting so no one makes any judgement from it. It basically allows you to get sound from the AF. I mean the amp will still sound better than most of the tube amps I have had but it holds it back. My T50 has never sounded this wide, spacious, and sweet before. The sound stage is HUGE and the imaging is wonderful. I have some better tubes inbound and also a new cable so it won't be too long before I am able to really enjoy the amp. I can say though that I even with my T50 I was totally enamored with the tones coming from it.