I found an interesting article on building a linear amp with MOSFETs: Homebrew Challenge II Co-Winner, The Lowest Cost Entry (David W. Cripe, NM0S), QST October 2010.
It uses two IRF520 MOSFETs that operate in Class E mode. The technique called Envelope Elimination and Restoration (EER) is used to make this a linear amplifier. As MOSFETs are relatively cheap and the efficiency of Class E amplifiers are very good (around 90%), this is something I am interested in and I would want to experiment with sometime.
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