You have to get one idea out of your head. It is not that simple. In an amp, caps are part of a circuit. How they interact is paramount. So putting in caps "regarded to sound better' can actually DEGRADE an amp. Just use good quality parts. Beyond that if you want to spend years experimenting to get the last tenth of one percent be my guest. Not many here have worked on that amp. I have, but the same components are not available today.I would suggest searching the net for amp forums if you are that worried.