Loud hum when connected to a guitar amp

When I insert the ART Tube MP StudioV3 preamp into my guitar’s signal path there is a loud hum and the audio signal is weak. I’ve tried different configurations but haven’t been able to get a satisfactory sound. Could it be the tube?

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Hi Patrick Martin

Is it working well previously?

Open up and check on the circuits.

Check for any possible dry solders and capacitors.

It seems the capacitor is a little close to the tubes, which may affect due to heat.

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