Hi jr - glad to see that you got the viewfinder, and that it is in good working order. They are definitely fun to play with - there are several adjustments on the boards to adjust the picture quality, just like a real TV. You are correct in your assumption that the box behind the mirror is for the photocells.
"Reason: add "(the housing)", I am not taking the tube apart!" - When I was young, I used to literally "take apart" picture tubes to see what was inside, and how the gun worked. I never did find the lens and prism that they always showed in the diagrams of how the picture tubes worked - very disappointing, but then I had no clue that they meant "ELECTRONIC" lenses and prisms - not physical ones - what did I know - I was STUPID enough to bust open picture tubes then! I even handed in an electron gun from a very old B&W CRT with my report on CCTV for my Mass Media class in high school - got an A because of it.
Have fun with your toy!
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