Take a look at these EL-34’s from NessTone. I think they are OEM by Shuguang in China which I thought was a pretty good factory.
What is the brown stuff? It’s not getter, the top is nice and silver where the getter is. It looks like a burn on the glass but I don’t know from what or why. I have to on all 4 tubes. They run and sound fine. Bias is dead on. Are the tubes dying? Something else? I don’t have that happening on my JJ’s they are nice and clean. Weird…
