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I repaired an amplifier equipped with a Russian vacuum tube. As a result, it turned on, but there was a lot of noise. I completely disassembled it, cleaned it, and reassembled it. The LED was blue and ugly, so I replaced it with orange. In the video, I only tested it with headphones, but after the repair, I connected it to my main PC and connected it to Fostex speakers and tried using it. It's light even without doing anything, but it's noisy (apparently that's the specification). You can't use a transformer power supply for the preamp (a loud hum noise will be heard). I think it's probably designed to be weak against noise. (The sound was normally good) Looking for members Anyone who wants to feed sweets to Big Brother Kumagoro / @kuma56diy If you want to know what tools Big Brother Kumagoro uses, check out the Street Junker Association website #junk #repair #carrotone #vacuumtubeamp