http://www.voacap.com/hf/index.html
http://www.sherweng.com/table.html
Nice library with manuals and manuals… https://eb1dgc.webcindario.com/manuales2.htm
All the manuals… http://www.radiomanual.info/schemari.html
Amateur Radio homebrew electronics https://www.zl2pd.com/index.html