Pair of 1945 JAN Sylvania 6SN7W and a Tung Sol round plate black bottle 6SN7 of unknown vintage in the front end of a Cary Audio 300B SEI LX20. The Sylvania’s are the best sounding pair of 6SN7s I own, and I own plenty! In fact, too many.
oldest tube(s) in your system
Please let us know what they are running in too. Thank you for your attention to this matter...ha!
2 x 1949 Sylvania ladder plate 6BL7GT (in monoblock amps, custom built 2 x 6BL7GT + 4 x KT77)