At first I had the A21 paired with the Parasound P5 preamp and the Maggies. The sound was wonderful on great recordings but very harsh on less than perfect recordings. I was limited to playing about 1/4 of my CD's. Then I switched to the YS preamp and a tubed Vincent Audio CD player. it helped a lot, But still too many CD's were still to harsh. I could not tell you what preamp it compares to because I have only switched out a few preamps and most of them were SS. I can only tell you that as I am getting older I am going more torwards tubes. My new bedroom system is a tube integrated amp with a turntable with tubed phono preamp. The CD player is SS. I can now play all of my CD's.
Regards,
Dan
Regards,
Dan