Above: Electronic panel of the IBM 701 Defense Calculator, 1952.
The photo shows 8-tube pluggable units (they might be memory or part of the arithmetic unit). A photo of IBM 701 electrostatic storage (CRT memory) is given in Frizzell, Clarence R., "Engineering Description of the IBM Type 701 Computer", Proceedings of the IRE October 1953, pg. 1286.
CRT storage is "accomplished by the of devices similar to a television set; the characters are recorded on the face of the picture tube. Unlike the television set, however, the information stored on the tube is read back when required" .
Also see: Riding the Whirlwind by Dag Spicer, at the Dr. Dobb's website, which discusses CRT memories (Williams Tubes).