Theo,
other parts can fail due to the tube failure such as resistors that would have a fuse act, and DC electrolytic caps that need to be checked whether the equipment worked or didn't.
small signal parts less-likely to be a culprit but power supply as with all electronics take the largest hit.
normally for the components you've mentioned, built quality is on the top level vs. others. so for the price point if you're looking for reliability, they're the right ones.
other parts can fail due to the tube failure such as resistors that would have a fuse act, and DC electrolytic caps that need to be checked whether the equipment worked or didn't.
small signal parts less-likely to be a culprit but power supply as with all electronics take the largest hit.
normally for the components you've mentioned, built quality is on the top level vs. others. so for the price point if you're looking for reliability, they're the right ones.