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These are the real deal. They were a very common Russian Millitary dual triode for decades and a popular audio tube In Russia during all that time as well, just as the 12AX7 was in the US. Reflektor tube factory, where all New Sensor tubes are made, have been making these for over 50 years. I have seen lots of these Reflektor made 6SL7 tubes from the 60's,for sale as "rare NOS" for 40-60 dollars per piece.