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You could pull the 6AU6 sound IF tube to check if the noise goes silent, if so you'll know if the noise source is not after that stage. If it's still noisy try pulling the 6av6 audio frequency amp tube. Basically you need to divide things up to narrow down where the noise is jumping in.
Last edited by Kevin Kuehn; 11-15-2021 at 06:00 PM.
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