I have used these to power tube heaters instead of TO-220 linear regulators. Now I don't have to worry about heat or heatsinks, and they're not that much larger or more expensive than their linear counterparts. However, be careful with the trimmer. They are easy to break. A small issue I had is that the pinholes are not multiples of 0.1" so they don't fit perfectly on a standard breadboard, but close enough that you can easily slide them in with some pin clearance.
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