A pair of November 1943 Sylvania 6SN7 GT's in Supratek Cabernet.
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)