In reply to MM0FMF:
Hoping to get the 6m one done for October. It will basically be the design in the new VHF/UHF manual using IRF510 devices; probably 2 + 2 rather than the single pair used in the HF amp I built, to get a few more watts out. I tried other devices but wasn’t happy with the (in)stability.
The issue is the 12V; I cart a couple of small (4.5Ah) SLABs up the hill for the HF amp (and the 2m amp too) to provide 24V. The original Packer amplifier http://site.hfprojectsyahoo.com/hf_packer-amp
had a switching PSU developing 24V at 5A (so a decent 12V supply needed!) but I don’t (much) mind the weight of the SLABs
As Andy says, I’ll let you know how it goes. The HF version gives 35W out for 2.5W in. More on my website, link from qrz.com.