I have a marshall mg 100hdfx half stack i just got second hand and its ok except when I change to the overdrive channel and it gets a feedback noise. and when it gets louder it gets worse. is there something wrong with the amp??
It could be your guitar pickups. try using another guitar or getting your pickups waxed at your local music store. also if your playing in a small room kind of loud, or if your using single coil pickups (like fender statocaster pickups) you will definitely get a feedback noise. if that does not work let me know.
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The answer is maybe.
Feedback occurs when the sound coming out of the speakers is picked up by your guitar pickups and amplified again, round and round. This can be a very desirable effect when it is under control, but running loose it is not only difficult to listen to, it can also blow out speakers and amps.
It is entirely possible that some of your amplifiers components have become 'microphonic' (acting like a microphone) and this creates a very bad kind of feedback.
If moving away from your amp and/or off to the side does not help you gain control over it, you may want to take it to a pro audio repair shop for an opinion. They will likely want a few bucks, but by giving them some you also get to expect good answers. Obviously it would be impossible to make a meaningful determination of it via text.
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