I like the composition and the layout, and think the idea is great. (We have a few of those amp things ourselves!) I do think that it's quite overexposed in several places, particularly the middle & tops.
I was prepared to love this image based on the thumbnail. When I see it full size, I am disappointed by the blown highlights. Greater tonal range would have made this an 8-10 image for me.
I like this concept of tubes. The hot spot in the middle of the image bothers me a bit. Try to photograph these objects with the lighting on the right and left side at about a 45 degree angle and I think this would be a better shot. Maybe if the objects were ganged together instead of separate. Ok enough nit picking. 7.