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  1. #1 Tube red plating? 
    You can never leave hai's Avatar
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    Apr 2011
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    Does red plating mean wrong bias or bad tubes?

    Because some 5881's on my amp seem to be red plating and i turned off the amp when i saw it doing that.
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  2. #2  
    Senior Member Ranger Rick's Avatar
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    May 2008
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    Bad tubes. I do believe that the seal is broken and oxygen has entered the tube.
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