I didn't replace the 500uf 50v cap when I recapped the rest of the amp . I want to use the 2505 now as every day player in horizontal bi-amp setup. The cap is original so I think I should replace it now. I have on hand a 680uf 63v PW cap or a 560uf 63v KZN (United Chem ?). I like the PW cap but I want to check in before I change anything. This cap C 79 ,the polarity is wrong on the schematic .What do you think ? Thanks