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@Jonny69
Onto the start of the build. Reusing the PSU case for the amp case, this was a potential layout. Heatsinks for the power transistors are on the back. The one in the middle is for the PSU. Not the best layout in the world due to the shape of the case, but I was thinking a big grounded heatsink for the PSU would provide a bit of shielding for the amps from the huge transformer.
One annoying thing with this case is the front panel is kind of fundamentally part of the structure. I figured if I could slice the frame off it somehow, I could bond a fresh front panel onto it.
This seemed like a good idea at the time. Over an hour later, and sore arms and hands, I had this: