Ringing is a indication of a set of barrels with good right solder joints. Every set will sound different. But a steady tone should be heard. A dull flat sound is an indication that there is a issue with the solder joints.
A flat sound is not always a dead indication that there is an issue. But, it usually means there is.
Sometimes extractors can interfere with the sound or cause a buzzing sort of sound. If it is removed or just held snug while ringing, you can determine if the odd sound is a result of that it not.
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B. Dudley
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