Ken Rad JAN 6SN7 VT-231 black glass, military stock from 1944. One pair in an LTA Aero, and one pair in an LTA microZOTL L3. I like them better than the Ray Reserves — slightly wider/deeper soundstage, better imaging and decay.
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)