[newsoulebel]

Hi JP. Hope you're well.
I have a customer who says his first Gen 573 starts making scratchy noises once it gets up to temperature.
Works for about 1 30 seconds then fails then doesn't deliver any audio. Just noise.
Can you point me to some basic troubleshooting? He was running it in a Midas L6.
But he has checked the other 573 in the lunchbox in the same slot and its working so he is very sure it is a problem with the preamp.
Best, Matt

[JPK]

First check the unit in a lunchbox that has another module in. If the other module still works when the MP573 fails, then the issue is not in the lunchbox.

starts making scratchy noises once it gets up to temperature

This is often caused by a bad solder joint the gets worth when getting warm.
Try reflowing the joints around the power transistor.
Next, try to follow the signal when it fails.