Hmmm...I have to disagree with the poster who indicated that one needed to change the stock tubes to get "anywhere near" the performance capabilities of the Hurricanes. They are magnificent as they are: the imaging size of instruments in the back of the stage do not shrink AT ALL, which is quite different from any other amplifier I've ever heard -- and this with the stock tubes.
When someone says tubes need to be changed, what I hear is that they want a different "sound," but the sound of, say, a double bass has its own integrity and does not need a tube change for anyone to hear what a double bass sounds like. The idea in much of the tube rolling seems to be to orient the SOUND to what we want, not to orient an acoustic instrument: the instrument makes its own sound.
The amps need NO tube changing to sound excellent. They might need tube changing to improve EVEN FURTHUR their many excellences AS IS.
Pardon my opinions, but it seems that the SOUND is what many people look for, not the music. I rarely see anyone discuss how a tube change makes the harmonic overtones of the violins appear more vividly, or the body of a double bass, or the strike of a hammner on a piano string. It's always "better bass" (what does that mean?! I truly am puzzled about it).
Having said that, I am also experimenting with "tube rolling" for the first time, because I am fascinated by how change can take place in the amps, but I know what real instruments sound like, and if the tubes reduce that "realness" then they do not serve the music, and I take 'em out.