Do Color Roundies Have DC Restoration?

[Robert Grant]

I wonder if the problem I have with my Emerson 1224 (circa 1958, 24" B&W, Sams 410) is related to DC restoration, and how can I fix it.

Even though the set has keyed AGC, the content of any video it receives greatly affects the gain.

If any significant part of the transmitted picture is white, the contrast goes through the roof, anything that is not white goes to a deep black with detail lost, and people appear to be in silhouette. If much of the transmitted picture is white, there will be overload and the picture will roll.
Likewise, a mostly black scene will appear dull gray.

Any coments (posted or PM) will be highly appreciated.