Wang is not a multinational company, he is just a fanatic who managed to build this amplifier. I am publishing this video on his behalf, so you get the entire story behind the Micro PA50 project. His main goal was making this small affordable 50W HF amplifier.
The amplifier can be purchased on AliExpress. I totally support this project and I hope you will too. Thankful to his endless efforts, we have now access to an affordable small amplifier for our QRP rigs and I wish him good luck with his next projects.
I translated the video with English subtitles so people can follow along.
Leave a comment in this comments section if you want some feedback from Wang in case you have more questions.

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