Crossfire C7 2000.4 nasty signal.

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Hello everyone, I have with me a crossfire C7 2000.4, the amp works but the signal on the oscilloscope is nasty looks like some one also work on this amp before. Does someone knows what are the original mosfets are used on this amplifier power supply and output mosfets just want to make sure they used the correct parts. They have IRF3205s on the power supply and FB31N20D on the output section. Thank you.
 
Yes all the channels are the same.
 

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