Recently Tom, WB4JWM, developed an amplifier based around a pair of IRFP250’s that used the output network of GW3UEP amplifier and the input squarer of WA3ETD. His results have been very good, reporting that he has “…added a dual mosfet driver and used two IRFP250’s in parallel but with independent drive. This is very stable at all levels of drive with a clean output. I’m very pleased as to how it has been working running at 225 watts out cool at 36VDC.“
Tom submitted this document with images, a few part numbers and answers to a few common questions.
Schematic is presented below, by permission. Questions? Contact Tom at his QRZ.com email address.