Good Evening, I'm just about ready to power up my AU-20000 after replacing the output transistors and fixing up the F-2511 (Protector Circuit Board), the F-2508 (Power Supply) and the F-2507's (driver boards). I made a dim bulb tester so I'll be using that. The previous owner told me that the amp hasn't worked in over 20 years, following a couple unsuccessful attempts to fix it (was blowing the main fuse). I'd welcome some advice on a couple items, if someone out there has related experience. 1) Is C07 on F-2511 (1uf 50v) bipolar? I think it is....that's what I've put in there. I'm seeing/reading conflicting info on that and just want to be as sure as possible. 2) Is it a reasonable approach to leave the F-2508 and F-2507 boards out for the initial power-up? Or will that cause unintended problems? I was wondering about focusing on the F-2511 board, making sure everything's OK there before putting the other boards in. I put extra fuses in the recommended places and will go with lower amp fuses all around. I've put a lot of work into this and want to be as cautious as possible. That's about it. Thanks.