This reminds me very much of some studies where audiophiles did double blind tests of various solid state amps against tube amps. Some audiophiles say that the tube amps sound "warmer", maybe they like 60hz hum. Whatever. Tube amps look cool and that is what is really important to them I think much in the same way that it is a huge status symbol to have an old violin. Same thing I think. Not that there is anything wr…
Some people do like the fuzzier, "warmer" sound (the hum is part of that) that tubes have.