I got mine about 2 days ago. Running with the stock tubes, with it sitting out in the open on top of a CD player, I am astounded at how hot it runs. Yes, I am familiar with tube units; of course I know they run from warm to almost hot, but let's put it this way, after 5 hours of use yesterday, the volume control was so hot that I could barely touch it momentarily without almost burning my fingertips. No, I don't have sensitive skin; my hands are fairly calloused from too much work. I couldn't let my fingers linger on that dial. I know this unit runs pretty hot, but is this hot normal for this? It sounds wonderful with Sennheiser HD590 Jubilees and Hifiman 400i phones.