Not all builds are big and fancy. Sometimes you just have to build something to do the job. This 100w dummy load is 20 x 5w resistors in parallel, nothing fancy and should handle the 60w i wish to throw at it for a couple of amplifier projects i have sitting here.
The 30w dummy load i build previously, 10 x 3w resistors was starting to get warm around the 25w mark, so i think this new one should stay cool to 80 or 80w quite easily. I will add a 12v fan to the case if i need to cool it and give it more power at some stage.
Resistors soldered to the board in a grid 4×5.
Being 5% parts you expect some variation, but near enough to a 50 ohm load as you can get.