G8IFF/M0NHF/KC8NHF's HF-Packer Power Amplifier

My version of Virgil's HF-Packer linear amplifier. I've rehoused it in an alloy diecast box and included a small cooling fan. It has an output of 35-50 watts.
The row of holes along one side of the enclosure are the air exhaust.
The circle of holes are the air inlet for the fan. The rotary switch selects the correct high pass filter for the band being used.