I made one of my ‘artisan PCBs‘ in the usual way, and construction was straightforward. When a faint flicker of QRO interest returned recently, I fired it up to the full 50 watts into a dummy load on the bench, and that gave me the impetus to finish this project at last. ![]() ![]() I started my build in late 2017 but my fickle homebrew energies got focused on other projects. All reported a trouble-free build and a good 50 watts from the Class AB IRFZ24N FETs on my bands of interest, 80, 40 and 30m, with a bit less on 20m. This design got some traction with some SOTA activators a few years back, so I studied the stories of builds by Glenn VK3YY, Andrew VK3JBL and Glenn VK3PE. The FETs are commonplace and cheap - they can be bought for as little as 98c each! The amp offers a useful order of magnitude (12dB) power lift over QRP levels, and apart from the power FETs can be built from an averagely stocked junk box. Don won the QST Homebrew contest in 2009 with this design. ![]() Don W6JL’s 50 watt FET amplifier is a popular afterburner for FT817s and other QRP rigs and exciters.
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