"How many consoles on an E-3?"
It depends. The USAF E-3C has 14 consoles - the E-3D has 10. I believe that the NATO E-3A Mid-term also has 14(?) - used to have 9 when I worked on them before the mid-life update. The consoles are multi function and can be changed to support specific roles in the aircraft. The number of radios also varies between models/nations.