Help With MT15 Noise

Mr.Tim

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Joined
Feb 10, 2020
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I ran into the oddest and noisiest hum on my MT15. Now the noise only starts when I run effects through the FX loop, I have tried the same setup though my Mesa and do not get any noise, but when I unplug the chords in the loop the noise goes away. Ive replaced the preamp tubes so I don’t feel thats the issue. Ive have not replaced the power tubes. Would that effect the FX Loop noise?
 
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