One could make a case to move from tubes to SS because they prefer the sound of a SS amp as that is a decision based on personal preference. One can also make a case that they don't want to pay for tube replacements. That is also valid with amps with expensive tubes (ie. 845's or 300b's) but if one is careful in choosing a tube amp they can buy one that doesn't use expensive tubes.
But to say one wants to go back to SS because they are easier to maintain or are more reliable is not valid. A point-to-point wired tube amp, with no printed circuit boards is one of the most straight forward designs to diagnose and repair.
But to say one wants to go back to SS because they are easier to maintain or are more reliable is not valid. A point-to-point wired tube amp, with no printed circuit boards is one of the most straight forward designs to diagnose and repair.