Jim,

Yes, the fan is actually a CPU fan plus heatsink out of an old 200Mhz computer. The power transistor sets into a hole in the heatsink. The amp has holes drilled in the bottom of the enclosure just below the CPU fan. Seems to work well, however I may be hearing a "slight" noise from the fan... further testing will tell.

Well, thanks again for all of the help... I see that there is a link to a "HF" amplifier project to the left of this message board under "TekTalk". I am studying for my General ticket (written and morse) so who knows whats next!

Take care, Shannon