Yaqin Tube Buffer

Go for the CD3.
If your gonna bother with a buffer, the better one is only $60 more, actually has a cathode follower, uses better tubes, uses two tubes instead of one, and should sound more like a tube product.

I still think the primary purpose of a tube buffer is impedance matching ala autoforming, to use between the source and amp. I would ask Pacific Valve who I believe Advertizes here. I agree though with Elizabeth the the two tube 6SN7 model is prolly the best if it does infact introduce a tube sound. Tube sound however is frequently squashed by the SS amplifier if that is what is downstream.

I just purchased the Grant Fidelity 283mkii which I believe is the same unit as the CD3. The reason I purchased this model was: (1)It has a on/off power switch. (2)It uses 6SN7 tubes instead of the 6922 family of tubes. The stock chinese tubes sounded not so good, so they were replaced with some electro-harmonix that I had on hand. (much better) I am very pleased with the sound of the unit which is connected to a solid-state integrated amp. It introduced a very noticeable amount of "tube sound" into my system.... I would definately recommend the CD3!