Just picked up a 67 - 69 fender Bassman stack. Grabbed it in good shape for $300 for the original owner. Only issue is it doesn’t power on. I had some sore fuses around and switched that, no luck, unless there’s another fuse in there I’m unaware of. What’s the next step I can take to see if it’ll power up? I know these things can be dangerous, I just want to give it a few tries at home before I take it to a tech. Any info is great Appreciated. Thank you!