QUAD 405 Clone https://www.diyaudio.com/forums/solid-state/196210-quad-405-clone-13.html
Quad 405-2 ala LJM https://www.diyaudio.com/forums/attachments/vendor-s-bazaar/914201d1611353125-ljm-audio-ljm-quad405-2-schematic-png
QUAD 405 Zobel https://www.diyaudio.com/forums/solid-state/196210-quad-405-clone-5.html#post4097521
Rusian site with schematics https://translate.google.com/translate?hl=&sl=ru&tl=en&u=http%3A%2F%2Fwww.quad-405.ru%2Fdiy-china-clone-quad-405.html&sandbox=1
QUAD on EBAY https://www.ebay.de/itm/2pcs-QUAD405-125W-125W-power-amplifier-kit-dual-2-0-channel-for-HIFI-DIY/132357237977