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happy new year to you, and thanks a lot for the answer ! :) so, I should replace it...I've played for 15 minutes the whole amp with this tube in this condition...I've noticed it just later...it's a problem ? P.s.: the 4 power tubes should all light in the same way or not ? Just curiosity.. :D...

Hi guys, I'm kinda new here...sorry if posted into the wrong section ! I've got a question for you all, please don't leave me with this doubt in mind :D I purchased an as-new Mark V head, and yesterday I noticed this strange kind of colour into one of the tubes.. It lights much less than...