[Tristan Lall]

I hope that this isn't some crazy idea to hook up phase-change heatpipes, or worse, a liquid cooler, to TO-220 heatsinks. That would be rather difficult. Now, a very massive heatsink might work, given enough conductivity and surface area, but it might be difficult to secure to the FETs; plus, you'd trade weight for electrical power consumption.

But ultimately, like Joe says, <R55> doesn't seem to allow it.