I believe that the main thing if you want to hear a tube amplifier is that you just have to assemble it yourself - and that's why I assembled all of these devices myself. Time factor: I am convinced that within a week of assembling one of the above machines, you will hear a tube sound. The only way to learn the rightness is to build a machine then to listen.
It is evident that a tube amplifier can be make a reality in diverse outer forms. External elements (controls and terminals) everyone will do things in his own way according to his own preferences and ideas. All amplifiers thus reflect the individuality of the creator.