Thanks Ken, I thought Zenith just made the tubes, good to know. It says Zenith CD19MXRF06.
I've got 2 of these in some midway cabs I picked up (super pacman and ms. pacman.) One seems to be working but I can't get it to sync, the other is out.
This is the only monitor actually made by Zenith for arcade use. I have only seen one in a Burgertime and one in a Super Pac. I remember what a piece of crap this monitor was. I think I yarded them out and replaced them with Electrohome monitors.