The audio circuits of the amp should be grounded to a zero-potential signal ground to reduce noise in the signal further.This is especially important in amp since they are designed to amplify the signal and any noise within the signal. The ground lines of amp are usually idealized as an infinite source or sink for an electric charge, they would absorb an unlimited amount of current without changing their potential. Second, the ground line of amp is common curren return path for all circuits of amp. Improper grounding can also lead to malfunctioning and damage of the amp and its connected audio devices. Bad ground could lead to personal injury if someone touches the metal parts of amplifier.
More importantly, the amp should be connected to the same ground potential as all the other audio equipment in the system. The first function of amp ground is safety.The amplifier should be grounded to earth for safety reasons. Normally, we chose common return point for all power supply and various amp stages as ground point. Certainly, "Ground" is only relative concept, any points in circuit can be defined by zero potential point. The voltages of other points in the circuit are compared with this ground. In electronic devices included guitar amp, the term "Ground" means a common reference point or potential voltage, which can be assumed to be "zero potential". What is amplifier ground, Why we need ground an amp? and where should we ground an amp? How to deal with with ground of amp? The electrical ground is critical concepts in the guitar amp. Guidelines and tips for assembling a tube guitar amp
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