A guy is trying to sell me a Fender BXR 100 combo amp.When I got the amp home it had a terrible crackle sound come out any time I hit a string. It does not sound like a blown speaker as there is almost an electronic buzz over tone that happens. I get the same sound when i turn the volume up or down. I'm tempted to have the amp checked out and see if it it would be worth fixing. Has anyone experienced this problem? Is this amp even worth the effort?