[Tubejunke]

Mine was the 18C24Q chassis. Yours is probably an 18C20. Your chassis will be identical, possibly with a 5U4 instead of a 5AU4 rectifier, and other small changes or actually lack of changes necessary for Space Command. With what I have yours could become a Space Command in a heart beat!!! I forget if the flip down control cover says just Zenith or Zenith Space Command.

Seems like there was a piece of raised plastic or metal script mounted on my C.R.T. surround bearing Space Command 500. Anyway, I found a Sam's .pdf that I can email you. This site does not allow space for the 4+Mb upload. I hope this is a help to you. And I am regretting the scrap job more and more now that there is a fellow enthusiast on board. I felt like I was the only owner in the world of one of these, but I will never get it because my set was not what you would call common. Not that many people had a remote set with a large 24" tube to stare at! At least not compared to those who had 21" ers, which was pretty standard.

I stick by a statement that I have made in the past. It doesn't have to be a "roundie" or a junk Predicta to be VERY cool and well worth purchase, use, and enjoyment.