Pass Labs, Pah, runs a bit warm, but I could keep a hand on Aleph 3 for 10, 20 seconds. Now my Viva Solista 22watt SET is really warm. You can cook a meal and run the central heating with that, as well as being a great sounding amp. What I don't understand is that it is Italian, it is pretty hot there in the Summer, how can they stand it? I have to have a Karan K180 for use from may to September in the UK