Quote:
Originally Posted by N2IXK
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You often see faded/discolored getter spots on power tubes (like horizontal output tubes) that have seen many hours of hard service.
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Absolutely. 7591, 6L6GB, 6550, you will often see the getter flash that looks kinda like a cola color. But I have had many that still worked just fine albeit a little weaker than NOS but still worked fine...