
I'd like to take a stab at this...
Having a clean logo is in keeping with the zen tradition.
Could we try this with the orange "Z" removed from the chrome circle around the tube pic?
I think you should keep this image of tubes within the circle because it is much more easily recognized by people new to tube audio and conveys the crystal clean warmth of tubes against the pitch black background.
Also I'd like to see the "amps" portion of the zenamps logo a solid color matching the red bases of the tubes. The left portion of the "a" in "amps" is very close.
Remove the motto and the ".com" and you have a perfect logo IMO. The motto is better suited within the overall web site experience.