Tube Cage On or Off. Does it Make any Difference?

Hey guys. I have a Mystere ca11 tube preamp which I really like. It's paired with CODA 10.5r SS amp, Manley Chinook preamp, Rega Planar 25 turntable, Dynavector 10X5, and Totem Sttaf speakers. I enjoy taking the tube cage off in order to amuse myself by watching the illuminated tubes while spinning vinyl. The question I have is whether removal of the tube cage affects performance of the device or sound in any way. I've played albums both ways [cage on and off] but can't really discern any sonic differences but wondered about the scientific aspect of my decision. Your thoughts are appreciated. Cheers!