Solid state to Tubes is a very easy move to do and even easier with the VAC equipment (and it looks great also)
What speaker cable is that?
Quick Tweak on the Sub you should do, is go buy a 25lb bag of #6-#7 pound Lead Shot at a gun shop and set it on top of the sub and either put the sub on a Sistrum rack SP4 or Float it with some Aurio Pro's. The Bass will tighten up even more!
What component do you have the Juice Goose on? and did it make a big difference?
I love the Speaker Stands!