Yes I know I missed the meet, but things came up, and I really wanted to be there but such is life...
A long time ago I used to sell preamps and headphone amps with socketed op-amps and of course you could change them and roll them and I tried so many 
But then I also made discrete op-amps that plugged right into the op-amps sockets and I liked those better....
Then along came the dedicated headphone amplifiers ICs.....
Well ever since I tried those I've never turned back.
And because the ICs I use are not pin-for-pin compatible with most op-amps, using a socket didn't make any sense.
So I have been down the roll-able op-amp route and even the discrete route, neither am I done with as that was about 2 years ago....
I have since seen the use of some very nice looking op-amps, on paper at least, and have discovered a few new discrete op-amp circuits.
So I may open up both avenues soon or over this winter if I begin to feel creative again.
The nice thing about the roll-able op-amps is that you get to change the sound so easily and cheaply, well for the most part cheaply.
The op-amps I want to try run in the $60 range and that is very expensive for op-amps, but I figure they must cost $60 for a reason...
The circuit I'm going to try first is a discrete Class A amp-buffer.
I have seen so many designs over the years and this one has eluded me... until now...
I think it has come at the right time....
Edited by hotaudio40 - 12/12/10 at 10:54pm