Now Selling Xin Amp - SM-IV - plus chargerThe opamps are the ones Xin provided, I never tried to swap them out.
I love this amp, but am looking to try something new. Will bring it and the charger home from the office this weekend and try to post photos. I use it successfully with the following phones: HD650, Grado 325i, and AKG 701s.
Wish Xin was still making amps, but I've got no control over that. :-[