Whats the difference between MOSFET & Class A, AB

Read some of Nelson Pass's articles on his website. He's a big fan of MOSFETs running in class A mode and I'm a big fan of his ss designs. Is this some kind of trickle down admiration thing? :-).

FWIW, I'm a tube amp lover, especially single ended ones.

Ok guys just my opinion, there is no a clear winner and neither a general rule but only personal preferences.
If you only want be beguiled, maybe there is no alternative to tube and single ended amplifiers in particular.
Personally I think the best thing to do is to have at least two audio systems in which experiments tubes and solid states (among which mosfets) and enjoy the music in function of your daily mood.

I think that you can get WAY to hung up on circuit topology and device type when implementation of the circuit is most important, once you get past the ss vs tube divide. I've come to believe that there are theoretical advantages that tubes provide that allow most any "good" tube design to perform better w the speakers I have than any ss design, but beyond that I have found that the differences between circuit topology and Class of operation are less significant than I had originally thought. I might be all wet for ss amps, since I have not had much experience w them for the last 5 years or more.

I like the concept of two audio systems,sorta like a wife and a girlfriend.

12-16-10: Markwatkiss
I like the concept of two audio systems,sorta like a wife and a girlfriend.
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BINGO !!!!!!!! .............:):):):):