So I've had this Marshall DSL40C for about five years now. It died on Christmas Eve actually and I found out that one of the tubes is blown. This is the first time I've had to deal with an amp issue like this so I am a bit of a noob. However, the tube that blew is a Marshall EL34 50/14. I'm not sure exactly what these numbers mean so if someone knows that would be a good help. Also, I know Marshall came out with a newer design to the DSL's a couple of years ago and mine is not one of those, and also the only tubes I can find are EL34 50/50's. I'm not sure if I absolutely need a 50/14, but that's what the one I have actually is so I'm guessing I'd go for a 50/14 if I can find one. Any help would be greatly appreciated!!