My theory goes like this: The ceramic jacket stresses with heating and cooling and finally cracks and chips. Once the metal plate is exposed it loses its ability to disapate heat and starts to "cook", until it fails.
The originals are 3W. I have a brand new set of KOA 5W replacments Installed on both boards,
Generally, I always make the same change to both sides of the amp... what is done to one side, is done to the other. This is to ensure that there is a componets to component match across each channel.
