Who woulda thought in this day and age people still use vacuum tubes? Yes there were vacuum tube computers in the very old ages. But transistors are IT. They consume a lot lot lot less power and switch much much much faster. You talk about gigahertz in transistors and well hertz for vacuum tubes. vacuum tubes are analog based devices while transistors are digital.
Several studies by engineers have shown that electrically, there is no difference in the outgoing signals between a transistor and a vacuum tube amplifier.
http://www.extrememhz.com/musketeerIII-p1.shtml
I am not sure that is true... There is a difference in the curve...
Well now if you want an audio amp for your PC well here it is.. To give it that ancient look...