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I just wanted to update my original post. I bought a quad of these JJ 6CA7's for my 50 watt Marshall so I would have a pair on hand when the first pair was used up. I ran the first pair for over two and a half years! One day I noticed a change in the sound; checked the bias and one of the tubes would not give any bias reading at all. Before that they never wavered; sounded great and the bias was always spot on. Two and a half years of life out of power tubes in a Marshall is pretty impressive. I still love these tubes and will be ordering some more now that I finally had to install my backups.