My ART MPA is making a nasty buzzy noise. Sounds higher and buzzier than ground noise, if that makes sense. Maybe like impedance mismatch or an open connection. It has worked fine for the last couple years, doesn't get banged around and suddenly took a dump all over my life. I checked my cables, tried swapping tubes, looked at the jack solder joints. It makes the noise with nothing going into it and with the input gain all the way down. I can still get signal through it, just super noisy.
Any ideas?
ART MPA II noise
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