Could be an internal fuse. If the thing didn't literally smoke and spit fire, it's probably not a huge deal.
I'm not 100% sure it will work out that way. Mesa's are fixed bias (without modification), so I think any given tube of a certain type will draw roughly the same current in such a setup, unless the color coding literally translates into a resistance value. I could be wrong about that, but I've caught the Eurotubes guys saying silly things before so I'm not sure.Dude from Eurotubes is going to pick me a set of E34L's that run a bit cooler so they will (hopefully) have a longer life span than the Mullards. :yesway: