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I'm noting that with your audio you are describing intermittent "crackling". Not a constant buzz. I'd suggest swapping out the audio output tube and also make sure the socket contacts are good and clean. I had the same issue with my DuMont RA103 but found it was just the af output tube was on its way out. Fer sure, focus on your horizontal drive issue first. The audio should be a quick fix!
George
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