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We will remake the amplifier with a fixed bias to a combined one. In this video, only theory. In the second part, we will solder. I make chassis for tube amplifiers. I make the amplifiers myself, I tune them. My VK page: https://vk.link/magiklamps 4276 4000 6517 9799 - this is for those who want to thank for useful advice)) My email: [email protected] This site has detailed instructions for assembling the amplifier: https://soundaddict.ru/