I run AES DJH preamp and Sixpacs, both with Jensen paper-in-oil capacitors, and am immensely satisfied with the sonics. The little DJH preamp is tube rectified and direct coupled, which I believe makes all the difference in the world!
I have also had good results with SimAudio electronics and my M22's.
I have also had good results with SimAudio electronics and my M22's.