"F2FO, amateur radio since 1959, here shows the various stages of construction of a lamp triode conducted by the Centre. This lamp has helped to establish links with other amateur radio operators located on 4 continents. If you want to know more, visit his personal website:" click here
It's nice to see home construction alive and well still.
Thermionic devices will shrug off power surges and spikes that would totally fry a p-n junction. Plus, their slower reaction times are not necessarily a disadvantage, especially in when it comes to music.
And they are more resilient to the EMP pulse from nuclear bombs, click here and scroll down to Limitations of Electromagnetic Bombs, the Russians have been using them for years in their aircraft, the tubes are tiny, not much bigger than the OC71 transistor amonra mentioned.