I have a shot at a clean 60s SFDR. The amp looks killer and has very obviously been professionally serviced. At some point, someone replaced every single cap on top of the board with those mustard yellow caps that people seem to like. Filter caps were replaced, too. What impact will replaced tone caps have on the amp's sound? How noticeable is it? Does the impact diminish over time as the new caps are used and worn in? Would you expect the tone cap replacement to affect price?