In case you have never seen this feature, here it is. The Marconi Mark IV could be cranked up with the small crank on the lower front corner to give access to the Image Orthicon tube. Great camera and well engineered.
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Quick tube change-out!
Very interesting design from Marconi…
Worked on the Mk VII(?) color camaeras at CBS in the late ’60s. Great camera to learn on, as they were always breaking.