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Okay, I just noticed the second photo and it does look like you have the source and drains swapped. Might there be a short between them. I’d check out each transistor for a short using a ohmmeter. With the power cable to the board disconnected you should see an open circuit.
On Jul 17, 2018, at 1:42 PM, Clark Martin <kk6isp@...
Did you reroute the pins on the RD16HHF!, the are in a different arrangement than the IRF510. The IRF510 is GDS, the RD16HHF1 is GSD. Swapping the source and drain will blow the fuse like that.
I tried to do this mod: https://ubitx.net/2018/02/16/power-amp-fix/
I checked everything for shorts, and a multimeter connected to the power input shows typical capacitor behaviour. However, when I connect power, my 3A fuse instantly pops. Is it possible that fake RD16HHF1 are causing this? I'm kinda desperate.