I'm thinking I need new tubes on my DC. The effects loop tube at least, as it's dropping out now and then. I figure it's been quite a few years, so I'll just replace them all.
A. Stick with all Mesa
B. Try JJ's
I liked them in my JSX years ago, but I'm not sure how they'll be in a Mesa. The reason I'm attracted to them is that they're a good $50 cheaper for the whole set, and Eurotubes has a "lower gain" set that I'd like to try. The DC-5 has a ridiculous amount of gain, and I'd like to knock that down a bit for more usable sweep.
Make sure you check the contacts on your effects loop jacks as well; they can cause issues and become crackly if they become dirty, corroded, or bent.