I'm assuming that you have tried the obvious stuff like using a different cable and a different amplifier?
The Shure beta 57a is a very robust and reliable dynamic microphone and there is very little to go wrong with it apart from
- A wire broken off inside
- A broken capsule - can be caused by dropping it
You can inspect for broken wires by very gently unscrewing the microphone head and peering inside - however the wiring is quite short so be careful not to pull any wires off in the process.
A broken capsule can be replaced - contact your local dealer for parts.
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