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Guitar Amp Problems

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stevison

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I have a Behringer V-ampire LX1200H Head. I am having problems finding any schematics or service manuals for it. When I turn it on, it has a high feedback with nothing plugged in,( with high gain level) with low gain it has lost it's low end. I ran a line out the effects loop to another amp and had the same results. It's been slowly going on for a while. The volume used to drop and the volume potentiometer was very touchy. I keep turning it up and down. Due to current economic status, I am unable to send it to a repair shop. I'm an HVAC guy with limited experience. Any guidance would be great.
Thanks,
Jeff
 
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