Tacoistas, The IRFPS37N50A looks like a serious MOSFet for switching applications, such as LF transmitters (as used in my original 100 watt design in the May-June 2005 issue of the AMRAD Newsletter). 500 v max, and 36 amp continuous http://www.vishay.com/docs/91258/91258.pdf available for $6.95 each and $5.95 each for 10 pieces from JAMECO 73 André N4ICK