I bought these from an Audiogon dealer a few years ago when I was trying out a Rogue Cronus integrated and played them for a few hours along with several other 12AU7 tubes before I sold the Cronus.They are labeled VSI USA with identical codes of 142 79 39, which I was told by the seller means there were made by RCA in 1962 and labeled for sale by VSI. Gray plates with halo getters. Original boxes. Test data when I bought them was 107/107 and 102/108 where a value of 56 is 65%. I don't have any way to verify the readings or the date of manufacture but they did work perfectly and sound great in the few hours I used them. If they don't work for you I'll take them back and refund your money. Free shipping to the U.S.
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