I would try to keep an open mind while listening but all those circuit boards in each of the three iterations of the AH integrated give me pause. My experience is that tubes, circuit boards, and push pull negative feedback a la Audio Research can be good if you don't mind then sounding like solid state designs and that if you are going to go pure fundamental tube with no negative feedback, you need excellent trannies, simplistic circuits, and P2P. There are no absolutes in audio and these are just my general biases, your mileage may well vary.