I for one am so glad I found Aric Audio Systems. I first got his Limitless preamp and that made my music sound better than ever (so I thought). I use 2 Cifte 12au7 tubes. I later got his Transcend push-pull stereo amp which he designed for me to use 12au7 tubes. The 3 12au7's I use in it are a Valvo, RCA command 5814a and Brimar cv491. I have 4 Sophia Electric EL34 power tubes in triode mode. Holy crap folks is all I can say. Aric's equipment has given my music such life and the 3d sound is quite awesome. His prices are great for what you get that's for sure. What he builds and how he builds is what sets them apart from others. He is so easy to deal with and is always there to help you. Give him a try and put a smile on your face.