You can find a good paper on a 1KW power amplifier (class E/F) for HF (7MHz) at url h**p://www.its.caltech.edu/~mmic/reshpubindex/papers/scott01.pdf [* => t]
check in RFglobalnet. I would suggest you also looking info in some books Power amplifiers of Steve C Crips and RF Power Amplifier (Irving Gottlieb, i am not sure about this name). Maybe I can scan some info.