I have a Mesa nomad 55 and I redplated an el34 last week. My amp sounded pretty bad afterwards so I swapped a set of 6l6's and until today they worked fine. I started to get volume swells and did some troubleshooting to figure out that a screen filter will be in need of replacing. For the hell of it I swapped the El34's back in and it sounded great for about 5 minutes until I started redplating one of the tubes again. Clearly one side is running hotter than the other. I am fairly confident on the screen filter being the issue but I won't be able to get parts until next week. In the meantime I was hoping to see if anyone could offer any insight? Should I change the screen filter in both sides? Could it be more than just one problem?