1. Is there any chance this tube is fine?
2. Without special testing equipment, will I be able to tell if it's bad immediately (visually, audibly) and is there any danger to my unit if it is?
3. If I replace it do I need to buy a new matched pair? Not sure if the individual biasing of the VTA pcb minimizes the need for matched pairs or if that has nothing to do with it.
4. If I need to replace them in pairs, does the matched pair go on the same side or the same position on each side? It makes most sense that two matched pairs with one pair in the rear position for each side and one pair in the front position for each side would yield identical results on the left and right, but somehow I feel like I might be wrong.
I'm just getting my feet wet here, so thanks for the help with this and previous posts.