SED Tubes Winged C KT88 St Petersburg NOS Matched Quad

For sale is a pair of New Old Stock Matched Quad Winged C SED KT88 Tubes made in the St Petersburg plant in 2005.  I bought these tubes for an amplifier project that never materialized.    They sound much better in my opinion that all Svetlana KT88 Tubes.  I like the sound of the  Winged C SED KT88 tubes even more than NOS Tung Sol KT88 tubes.
I purchased these NOS tubes from a dealer September 28, 2019 and will include the receipt and only opened them for testing with my tube tester.  I had a little trouble with the box tops and bent the corners a little when opening.