I posted over at MarshallForum as well but figured here wouldn't hurt either. I have one power tube not working on my head. I live up north and only have access to 2 matched GT EL34MD's. Where should they go(both on one side, both in the middle, both on the outside?) and can I get details on how to bias and to what mV? I've biased my Mesa amps but I'm sure they are different inside. I did a search but didn't find info on the 410HJS.
Thanks!!