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For questions about guitar playing in general. For questions specifically about electric guitars, see "electric-guitar". For questions specifically about acoustic guitars with or without pickup systems, see "acoustic-guitar".

3 votes

Noise while not touching guitar strings or metal parts

This means that the '0Vdc' leg of the rectifier - which is connected to the guitar - will float at mains frequency. … If the amplifier isn't properly earthed, you yourself act as the earth connection - but only when you touch the metalwork on the guitar. …
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