That's actually not an audio amp, it looks like a linear to boost the power of a low power transceiver for the 10, 15, 20, 40 and 80 meter HF Ham Bands.
You can laugh all you want at the fella's construction but I'll bet it worked just fine, and I've got a lot of respect for anyone that goes to his level of trouble to build something. Once upon a time Hams had to build their own gear if they wanted to get on the air.
I wouldn't complain a bit if they made that a new requirement to keep an existing lisense, or to apply for a new one. All the no-talent, couldn't identify an electronic circuit if it bit them in the arse CB'ers would get kicked off the Ham Bands in one swell foop !!!!