orgmorg Posted November 24, 2008 Report Share Posted November 24, 2008 I've got a SWR workingmans 10 bass amp with a balanced xlr line out. A while back, I plugged into this while everything was on, and got a loud pop. I'm pretty sure I even saw a small blue flash from the back. Anyhow, the output from this jack is now weak and distorted. What happened? How do I fix it? Another problem is that the amp has a constant hiss, regardless of the volume setting. I'm pretty sure this started at the same time, but it's possible I could just be noticing it more now that I have to mic the amp to record. Other than that, the amp works fine. Any Ideas? Thanks, George Quote Link to comment Share on other sites More sharing options...
Tim37 Posted November 25, 2008 Report Share Posted November 25, 2008 have you looked inside to see if there is any you can see wrong? Quote Link to comment Share on other sites More sharing options...
Ripthorn Posted November 25, 2008 Report Share Posted November 25, 2008 If there was a spark, it is possible that it weakened the solder joint to the hot wire. Take a peak and see what is going on. Don't forget to use your voltmeter to check for continuity. Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted November 25, 2008 Report Share Posted November 25, 2008 (edited) Popping noises are almost always from arcing. Check your solder joints around the XLR jack. You might have a bad solder joint on that XLR jack. EDIT: Are you sure that the cord you were plugging into your jack wasn't supplying 48V phantom voltage to your amp at the time that you plugged that cord in? If that happened, I imagine that could have fried something in your amp... Edited November 25, 2008 by Paul Marossy Quote Link to comment Share on other sites More sharing options...
orgmorg Posted November 25, 2008 Author Report Share Posted November 25, 2008 Are you sure that the cord you were plugging into your jack wasn't supplying 48V phantom voltage to your amp at the time that you plugged that cord in? If that happened, I imagine that could have fried something in your amp... That's quite possible. I was plugging into a small powered mixer that has phantom power but I don't know if it was on or off at the time. Probably on, though the way it sounds. I took a look inside and couldn't find any obvious problems, so I'm just gonna take it in to the shop when I can. Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted November 26, 2008 Report Share Posted November 26, 2008 That's my hunch as to what happened. Anyhow, please let us know what it turns out to be! Quote Link to comment Share on other sites More sharing options...
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