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Spider IV 75 - Terrible Static and Hiss

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I purchased a Spider IV 75 off Craigslist and for a year, it served me quite well.  When I turn the amp on now, I get a loud static like hiss.  The hiss is present with both volumes turned completely down and it hisses even when a guitar chord is not plugged in.  


I did a reset and the static went away while during the reset process.  Once the reset process was complete, the hiss returned.


Any guidance would be greatly appreciated.



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Try a pair of headphones in the rear jack - is the hiss present there, too?  Does the sound of the guitar come out of the speakers, or just the noise?

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