This French storage tube was used in Air Traffic Control (both civil and military) to convert the faint radar pictures into bright television pictures, while allowing the operators to keep the aircraft tracks during several minutes.

Both guns use electrostatic focus. The writing gun uses magnetic deflection, the reading gun uses electrostatic deflection.

Total length : 67 cm (26.38 in)

• Electrostatic Memory Analyser Tube TMA 403 X.