I suspect my CRO is not fast enough to catch the gap between gate (top trace) and drain (bottom trace) when powered up. Or I don’t know how to use it properly. In any case, I will keep at it, until I know for sure that this will not kill the GaN transistor. Also, this is why it takes so long to get up and running on microwave radio, so many rabbit holes, and why it’s interesting (to me).