Fan bracket for Little Dot MK3 headphone amp

thingiverse

This is a fan bracket for the Little Dot MkIII (Mk3) headphone amp. It secures a 92mm or 80mm fan above the tubes to allow for enhanced cooling. Cooling the amp generally shouldn't be necessary, as vacuum tubes are designed to generate heat, but this may help keep the chassis temperature reasonable if airflow around the amp is restricted. The power tubes, especially the 6H30, produce a significant amount of heat. The bracket is held in place by sliding it over the transformer box. This design allows you to quickly and easily access your tubes without needing any tools for installation or removal. I have uploaded several different versions for various heights. I recommend the 25mm version; this will allow you to mount a fan on the bottom of the bracket while still having room to clear standard 6P6-type power tubes. The 0mm version is flush with the top and requires mounting the fan on the top of the bracket. The FreeCAD file is included if you want to customize your bracket by changing the height, side wall length, or other features. Alternatively, you can ask and I may send or upload a modified STL file. It should be possible to modify the model to fit some of the other Little Dot models, but I don't have access to them to take the necessary measurements.