[Amps] MLA2500 issue

[Al Kozakiewicz]

>When I took the cover off, it appears one of the 8874's is much darker than the other. This might be nothing, as I have had various 8874's from different sources over the years, but >thought I'd mention it in case it means something

IIRC, the metal on those tubes is silver plated. Silver tarnishes . Typically silver sulfide (Ag2S - I have no idea where the sulfur comes from) and/or silver oxide (Ag2O), both of which are dark brown to black in color.  Means nothing, assuming that it is tarnish.

Al
AB2ZY