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Hum On Amp


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i recently bought a gibson ga-5 tube amp on ebay.

when i plug in the guitar it seems to emit a kind of hum - more like a slight distortion.

then i plugged out the guitar alone (so the wire was still inserted into the amp) but the hum still persisted.

when i removed the chord, it becomes silent.

i have two chords - tried it with both and got the hum.

what's happening?

appreciate the feedback.

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