Tube DIY Asylum

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That is called an oscillation

Posted by Chip647 on June 24, 2020 at 17:51:13:
Make sure your tube pins are clean and your sockets are tight. If you are a "tube roller" you could have a poor connection between a tube pin and a socket due to many insertions. If that is not solving it, pop in a new tube. You could swap your tubes between channels to see if the noise moves. If it does, bad tube, if it does not, bad socket,