>
>Some versions of the 4-125, 250, 400 etc have silver plated pins - certainly
>the tubes made by Philips/Mullard and possibly Amperex. Using Goddard's
>'Silver Dip' (I believe it's available in the US) as intended for silver
>jewellery/trays etc is a good easy way to clean those pins. The
>Mullard/Philips variants don't have the metal ring base of the Eimac's -
>there are/were Eimac variants without the metal ring base listed as
>equivalents, but I don't know about the pin material on those.
>
>Although the silver oxide is supposed to be a conductor, I'm not sure about
>the black silver sulphide.
silver sulphide is an electrical conductor.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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