Some 5687 tubes I just installed have a mild but definite burning-rubber odor. It's not extreme, but it is there if you sniff around them (and I can also detect it around the room). Has anyone ever had this? Could it be something oxidizing because they are newly installed?
It's a bit hard to tell, but it seems to be all 4 of them, not just one.
The tubes work fine, but look brighter than my old cheaper 5687s. They sound absolutely great, nice and smooth and mellow.
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