Doesn't it say something about it in the papers which came with the headphones? I think I read something about it, I think it was in those papers. They are on my head, and I am too lazy to check it at the moment though...
After I installed an Isoclean fuse in my amp, I sometimes get goosebumps as large as blisters. A painful experience I tell you.
Seriously, I don't know, I am really happy with my setup, and listen about every time I get the chance. It is too subjective to give a good answer since we all have different goals... I agree that there could be a backside to listening to gear at meets, as well as the positive sides of trying out different stuff.
Congrats on your purchase!
Although I am not much of a fuse believer, I have the Isoclean fuse installed in my Zana as well. At least, they should be quality if nothing else.
The Valvos are nice, good choice. Note that they are microphonic, at least all mine are more or less, but they sound oh so sweet, as long as they can sit undisturbed.
Would be nice if you post some impressions and comparisons to your other amps sometime in the future.
Hmmm... from my experience, I would say the HD650's have a smoother signature. I would not say forgiving, but I am sure you will find more ruthless cans out there.
Agree that they need a good amp to drive them to their fullest.