Res and Presence are both feedback controls from the output. SO if your noise comes out the speaker, then those controls are likely to affect it.
Feedback path could be involved.
I might short ACROSS R53 in phase inverter. Not to ground, but end to end. Does that kill the noise? Hell, try that with R50.
Feedback path could be involved.
I might short ACROSS R53 in phase inverter. Not to ground, but end to end. Does that kill the noise? Hell, try that with R50.
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