Hey just wanna say it's awesome to see another one of these WWII block cameras get restored to working order and any Iconoscope camera in general, great work and look forward to seeing more on it!
I myself have built a crudely working Iconoscope camera using the same RCA 1846 tube type and driven by video/deflection circuits I made originally for a 2/3" vidicon camera, my Iconoscope camera construction log can be seen on my site starting from this page
http://troysvintagevideo.0catch.com/...peproject.html .