I owned both the Belles Reference 150A paired with a Placette RVC and the Ayre AX7e, driving either Merlin VSMMe's or Lipinski L707's. Overall, I'd say they are more similar than not in what I thought their strengths, transparency, timbre, and dynamics. My experience with the Belles and Placette is similar to yours (the OP's) and I would probably give a slight not to the combo over the Ayre in my system and room, but the AX7e is a great integrated.
A possible addition to the list of tubed integrateds you are researching: the Rogue Tempest II which I also used for quite some time. And as a side note, I currently use a Lyngdorf TDAI 2200 which I have preferred to the many other amps I have used in the past.
A possible addition to the list of tubed integrateds you are researching: the Rogue Tempest II which I also used for quite some time. And as a side note, I currently use a Lyngdorf TDAI 2200 which I have preferred to the many other amps I have used in the past.