My experience with tube amps is that they tend to sound better after some warm up...same with ss amps. One of the things that I always wandered about when I was using tube amps was where in the life of the tube ( power tube) was I listening. I had an ARC and then a Melos and with the Melos, the power tubes would fail often; Sometimes in spectacular fashion. The quality of the tube was a major factor as far as the life and sound of the tube was concerned. With some of the Chinese tubes, the lifespan was maybe a few days or less! One of the issues I still have with tube amps is the heat they tend to throw off, however, after having lived with ss now for more than ten years, I personally am willing to add a tube amp for the difference in performance they provide. But, I still will use ss for my peace of mind.