Try checking the main board for any components that are bad. I have heard of some boards being damaged. In all possibility, it's probably the IRF510. If you need any I believe I have some in a parts bin from my father when he was building a QRP cw rig. It's a part from mouser so it should be good. I'll have to find it though my lab is a mess.
These questions and answers al all very interesting. Now I have mine working but only 2 watts RF output when I shout at it that is. Im making an proved mic amp to get a bit more audio drive as it looks a bit low. If I can get 4 watts with 12 volt FC input I will be happy. but I think the 510 is a bit soft and that's the main reason for a low output. kind regards Paul.(HS0ZLQ G0MIH)
