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The pre-SED Svetlana tubes are even better than the Winged C tubes. So in reality all of the good ones don't have the Winged C logo. You just have to not get fooled into buying current production Svetlana tubes because they are made by a different company with different internal designs. The plates are a good indicator of what you are buying. Old Svetlana 6550 and Winged C 6550 have rectangular notches in the plates, while the new production Svetlanas have round holes- dead give away. Just an example that all of the good ones don't have Winged C logo. Old Svetlana tubes are still the best! New ones suck because they aren't made right.