You didn't say what type amp. This is a common bad tube sysmtom.
It is easy to delete your duplicate post, But I forget how. Someone will help.
A strange “snap“ or “popping” sound keeps interrupting our music
We have good equipment, all digital (streaming to DAC to amp to speakers) but we experience a strange snapping sound as though some energy is built up, then released. Has anyone else’s experienced this? Could it have something to do with grounding, or inadequate grounding?