If a tech has a schematic and replacement parts are available, it can generally be fixed.
Swampwalker is correct - tube gear is generally easier, and it's important to point out that when you retube a piece of tube gear, you largely have a new piece of equipment.
A problem that some solid-state amp manufacturers would rather not acknowledge is output transistors going out of production - "boat anchor" is exactly what you'd have if you lose an output transistor in such a case.
Swampwalker is correct - tube gear is generally easier, and it's important to point out that when you retube a piece of tube gear, you largely have a new piece of equipment.
A problem that some solid-state amp manufacturers would rather not acknowledge is output transistors going out of production - "boat anchor" is exactly what you'd have if you lose an output transistor in such a case.