It sure stinks that its a TO-220, but then again, for a 10W SOZ it should cause no problems......besides the allergic reaction to TO-220 devices in general
Raka....how do you feel about the IRFP 230 after testing ??
Actually is a Motorola MTP33N10 what I'm working with right now. Can't comment about it because is not already alive.
Why don't you try a single one, and change the different mosfets you can get?
BTW, for a 10W soz, I would prefer some TO247, but havent tried yet.