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Yes, I'm very curious too!
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Pure speculation, but I could imagine that opening the standby switch stimulates an ultrasonic oscillation burst. Marshalls often have little stability margin and the presence setting influences the gain-phase condition. Typically stability increases with presence fully up.- Own Opinions Only -Comment
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Maybe try a 22pf cap across the feedback resistor anyway. Like I said, you can always remove it."Take two placebos, works twice as well." Enzo
"Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas
"If you're not interested in opinions and the experience of others, why even start a thread?
You can't just expect consent." HelmholtzComment
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