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Hi, so I got the radio about 6 months ago and I used it on and off several times with no problems. It came with 2pcs of an IRF520. Then the power dropped yesterday when I went to use it and luckily I had 2pcs of an IRF520N which I installed but did not really do much. So I guess I have mosfets, where do I take measurements so I can adjust the bias for each please? Thanks, I will try to take this a little further if you can help a little more. Adam