Depends a lot.
Worst case scenario in a pre-amp or other line level device is very different than the worst case scenario in an amp.
With a PRE or DAC, for instance, worst case scenario is usually replacing bad caps. If your power supply caps on an amp fail, or the coupling caps near the output stages, etc. then you can get into a lot of expensive repairs, and if they used proprietary output transistors which are no longer made this could mean the end of the amp.
Worst case scenario in a pre-amp or other line level device is very different than the worst case scenario in an amp.
With a PRE or DAC, for instance, worst case scenario is usually replacing bad caps. If your power supply caps on an amp fail, or the coupling caps near the output stages, etc. then you can get into a lot of expensive repairs, and if they used proprietary output transistors which are no longer made this could mean the end of the amp.