floresjc I was recently in the same dilemma: which AVA tube pre-amp to pair with my SET-400. I really wanted the FET Valve but budget considerations said T-10. I've been listening to the pair for almost a week now. Previously I had no dedicated pre-amp and was using my NAD C399 as a pre-amp. It was ok, but now with the T-10 the openness and detail are amazing. Sometimes on certain songs it seems a bit bright, especially on hi-hat and cymbals. I'm wondering if my perceived brightness could actually be a lack of coloration that was present with my previous components. I'll also admit that I need to experiment with speaker placement, and possibly some wall treatment over the bare sheetrock but I do have short carpeting in the room. As a side note, the Phono section in the T-10 sounds really good with my BIC 960 turntable.