Tubes / Valves

We all know that power surges and spikes can either (a) destroy electronic equipment instantly or (b) wear down electronic equipment over time causing premature failure.  My question is: is that any more or less true of tube-based equipment?  Ask another way: is it the transistors that are most prone to failure due to power irregularities, which would make transistor-free equipment more robust with respect to power anomalies, or is it the other components which are common to both (caps, resistors, etc) which tend to fail?