The heat sink fins need to be either bigger or a cooling fan needs to provided, but Norge audio people are stuck with what they have done, they simply do not want to make minor improvements or changes. I have talked to Mr. Laxman numerous times regarding the provision for a phone input option in their amps as vinyl is again coming back. He said if someone wants they can provide the phone pre in the amp, but cannot provide the print of the word phono on the front panel in the source selector switch section. In fact two of my friends who were interested in Norge, looked for other options because of this very reason. Similarly they are not interested to upgrade their UBT 1515 from mp3 to a lossless format digital player, but they call themselves high end audio manufacturers, though in a smaller scale.