I was running a set of nos 6v6 Sylvania metal tubes
they test as average, but they sure ran hot, a friend brought a
digital thermometer by, one tube ran at 212degrees, the other ran at 180degrees, they sound surprisingly good, but I pulled them and put some glass tubes in they ran below 180degrees. I ran them for several hours with no problems, except maybe the smell of paint on the cans getting very hot.
Just wondering if anyone has experience with these kind of tubes?