Weird Dual Rectifier presence control issue?

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MoistTowelette

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Oct 23, 2024
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I recently picked up this 2 channel rectifier and noticed this strange issue where the frequency seems to shift when I turn the presence knob. I'll attach a video. It also affects the total volume of the amp. It happens with the loop on or off. It's not a tube or grounding issue as far as I can tell. I'm guessing an issue with the negative feedback of the power amp? Anyone else have this issue?
 

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