Something that has been bothering me for a few years is the neon on my B9. It worked (but was pretty much dead the last few months) but it didn't have the intensity it needed. I completely redid my audio system to use an IPOD and merged channels to pour a stronger signal into the neon transformer interface. It took a few tries and an extra amplifier on the front end to supersize the signal. And it was worth it. I have a separate amplifier in the robots (B9 and Robby) but the front end amplifier pushes the main signal very strong to power both neons. The volume can then be turned down in the robots so it isn't too loud.
So here's a link of the two robots rehashing their rivalry from the 60's. This video doesn't show it but the TV is displaying the scene from Lost in space in synch with the two robots. Also sorry but it's a bit jerky as I was holding a small camera to film the action.