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  1. #1 Tube red plating? 
    Senior Member hai's Avatar
    Join Date
    Apr 2011
    get off my lawn
    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
    Join Date
    May 2008
    Bad tubes. I do believe that the seal is broken and oxygen has entered the tube.
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