I can see the insulation argument to why these are installed hanging on to the IRF510s but this puts a large mechanical load on the transistor legs and increases the risks of damage especially if one tried to use the uBITX as a portable, even as a SOTA rig.
One could fit a larger heatsink that was fixed to the chassis/casing or PCB and one would then have to add rectangular insulating washers between the transistors and the heatsink.
What sort of negative results should/could one expect from these measures?
And could one fix'em?
I envisage these positive results:-
- better mechanical strength
- easier to provide controlled cooling of the heatsink.
- a slight increase of weight