I wanted to use my Bugera 6262 cranked up a bit so I thought I need to design a quick load box so I can unplug the speakers and put the line out into my recording interface and use software based cabinets.
There isn't a layout per se but I've provided a schematic and pictures - it is a very simple design so you should be able to follow it easily enough.
you will also notice that it uses 2 100watt 33 ohm resistors in parallel which will allow you to use amps upto 100watts or in my case (130watt) an amp not turned all the way up
you need twice the power rating on the resistors as indicated on your amp - ie if your amp is 50 watts you need 100watt resistors.