Thread: "Black" PL81s
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Old 6th Sep 2009, 12:21 pm   #3
ppppenguin
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Location: North London, UK.
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Default Re: "Black" PL81s

The PL81 is a line output valve used in many TVs. It works VERY hard for a living and all the used ones I've seen have some kind of brown deposits on the glass. Presumably metal that has evaporated from the anode.

The only way to test them is to try them in a suitable TV. Despite the deposits they may be OK. Or not.
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