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Re: [Amps] MLA2500 issue

To: Mike Smith VE9AA <>, "" <>
Subject: Re: [Amps] MLA2500 issue
From: Al Kozakiewicz <>
Date: Tue, 15 Nov 2016 01:25:22 +0000
List-post: <">>
>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.

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