Hello

Here’s something you might consider trying, provided you have a 1/8th stereo male mini jack to a stereo RCA pair male cable and a portable CD player or Mp3 player.
First and foremost – turn power amp OFF, OFF,OFF!!! Turn volume down to zero on whatever player your using. If the amp has a level control, turn that down also as a precaution.
Now connect to player to the amp’s inputs and turn player on, then turn amp on.
Find a piece of music to test system with and SLOWLY bring up volume on player. (and amp if applicable)

Good luck.

Remember to shut power off on amp before any connections or disconnection of cables.

Those who have long enjoyed such privileges as we enjoy forget in time that men died to win them.