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)

xenolith09-10-2025 1:28am

pindac Details Discussions Posts This discussion Message User 3,920 posts 09-10-2025 at 03:11am Copy Comment URL Report Comment Edit Delete RCA Grey Glass Hamburger Font 6SN7 - 1940's Production Measured at my end by a friend and both close matched near Factory Spec's. I have other pairs of Valve Types all matched near Factory Spec's. from the 50's and 60's Production Era's
xenolith OP Details Discussions Posts This discussion Message User 211 posts 09-10-2025 at 03:13am Copy Comment URL Report Comment Edit Delete @noromance Beautiful piece of gear! Thanks for sharing the photo. Love the eye tube too! Does it ’close’ (or is it open?) at 325v?
jackd Details Discussions Posts This discussion Message User 1,125 posts 09-10-2025 at 03:26am Copy Comment URL Report Comment Edit Delete A pair of November 1943 Sylvania 6SN7 GT's in Supratek Cabernet.
xenolith OP Details Discussions Posts This discussion Message User 211 posts 09-10-2025 at 04:24am Copy Comment URL Report Comment Edit Delete Zoiks; 82 years old! It’s not a competition, but wow, that’s old...and no doubt great.
grinnell Details Discussions Posts This discussion Message User 1,187 posts 09-10-2025 at 02:02pm Copy Comment URL Report Comment Edit Delete Brimar 6V6G st from the 40's in my Decware Mini Torii